I have multiple view controllers in my application. And in each of them I have to show alerts based on some conditions. Instead of adding alert controllers in each of them, I tried using inheritance as follows.
UIExtension.swift
class UIExtension: UIViewController {
func prepareAlert(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
return alert
}
}
FirstViewController.swift
class FirstViewController: UIExtension {
//somewhere inside used the following
present(prepareAlert(title: "Error Validation", message: "invalid fields"), animated: true, completion: nil)
}
Similarly, used UIExtension in other viewcontrollers to show alerts. Is this way recommended?
For something like this, you are better off adding your prepareAlert method to a UIViewController extension. No subclassing required.
extension UIViewController {
func prepareAlert(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
return alert
}
}
Then your view controller:
class FirstViewController: UIViewController {
//somewhere inside used the following
present(prepareAlert(title: "Error Validation", message: "invalid fields"), animated: true, completion: nil)
}
This allows you to use prepareAlert from any view controller include UITableViewController, UICollectionViewController, etc.
The approach is technically correct, although if you consider extending all UIViewController instances, regardless of any conditions, then it's more handy to extend it directly:
extension UIViewController {
func prepareAlert(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
return alert
}
}
rmaddy was faster. But I decided not to delete the answer, but add another idea.
Another approach is to use protocol as a wrapper for certain functionality, and this is also widely used.
Say, you have a protocol, associated with some functionality, like generating alert, in this case:
protocol Alertable {} // or whatever else name
extension Alertable {
func prepareAlert(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
return alert
}
}
Then, whenever you want certain UIViewController instance (or any other class, you get the idea) to be associated with this functionality, simply do:
class FirstViewController: UIViewController, Alertable {
// Now you can do the same:
present(prepareAlert(title: "Error Validation", message: "invalid fields"), animated: true, completion: nil)
}
To sum up, making up a protocol and extending it, and then associating certain classes with it - to expose that functionality - is a very handy and useful practice. In particular, this is a good way to encapsulate some functionality, for example, if you don't mean global/class-wide access to it.
Some extension method I am sharing with you that is used frequently in most application you can use it in any where of UIViewController class and enjoy :)
extension UIViewController {
let kAPPNAME = "Your App name"
func showOkAlert(_ msg: String) {
let alert = UIAlertController(title:
kAPPNAME, message: msg, preferredStyle: .alert)
let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alert.addAction(okAction)
present(alert, animated: true, completion: nil)
}
func showOkAlertWithHandler(_ msg: String,handler: #escaping ()->Void){
let alert = UIAlertController(title: kAPPNAME, message: msg, preferredStyle: .alert)
let okAction = UIAlertAction(title: "OK", style: .default) { (type) -> Void in
handler()
}
alert.addAction(okAction)
present(alert, animated: true, completion: nil)
}
func showAlertWithActions(_ msg: String,titles:[String], handler:#escaping (_ clickedIndex: Int) -> Void) {
let alert = UIAlertController(title: kAPPNAME, message: msg, preferredStyle: .alert)
for title in titles {
let action = UIAlertAction(title: title, style: .default, handler: { (alertAction) in
//Call back fall when user clicked
let index = titles.index(of: alertAction.title!)
if index != nil {
handler(index!+1)
}
else {
handler(0)
}
})
alert.addAction(action)
}
present(alert, animated: true, completion: nil)
}
func showOkCancelAlertWithAction(_ msg: String, handler:#escaping (_ isOkAction: Bool) -> Void) {
let alert = UIAlertController(title: kAPPNAME, message: msg, preferredStyle: .alert)
let okAction = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
return handler(true)
}
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) -> Void in
return handler(false)
}
alert.addAction(cancelAction)
alert.addAction(okAction)
present(alert, animated: true, completion: nil)
}
}
USES
class FirstViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//Only Info
self.showOkAlert("Hello")
//Info with Okay button
self.showOkAlertWithHandler("Hello Again") {
print("Tap to Okay")
}
//Show alert with Okay and cancel
self.showOkCancelAlertWithAction("Hello with Cancel") { (isOk) in
if isOk {
print("Okay")
}
else {
print("Cancel")
}
}
//Show alert with actions
self.showAlertWithActions("Hello with action", titles: ["Allow","Don't Allow", "Cancel"]) { (tapIndex) in
if tapIndex == 1 {
print("Allow")
}
}
}
}
I'm trying to declare a function for showing alerts in my app. To avoid repeating work, i'm trying to use same function for all my app. I tried to do that by creating a class with function showNotification. but when i create an object of that class and call the method, nothing happens. How can i do that?
class SharedPropertiesAndMetods : UIViewController {
func showNotification(title: String, message: String)
{
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "تائید", style: .default, handler: nil)
alertController.addAction(defaultAction)
present(alertController, animated: true, completion: nil)
}
}
Use an extension like this
extension UIViewController {
func showAlert(title: String, message: String) {
let alertController = UIAlertController(title: title, message:
message, preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: {action in
}))
self.present(alertController, animated: true, completion: nil)
}
}
call the function like this
self.showAlert(title: "hi", message: "test")
What I would do is to create a 'generic' view controller that do the job and than inherit from it:
1. If you want to display alert each time view did appear:
class GenericViewController: UIViewController {
// MARK: - View lifecycle -
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if let notification = self.shouldDisplayAlertNotification() {
self.showNotification(notification)
}
}
// MARK: - Internal methods -
func shouldDisplayAlertNotification() -> AlertNotification? {
return nil
}
// MARK: - Private methods -
private func showNotification(_ alertNotification: AlertNotification) {
}
}
class MyController: GenericViewController {
override func shouldDisplayAlertNotification() -> AlertNotification? {
return AlertNotification(title: "Title", message: "Message")
}
}
Where AlertNotification is your custom model class:
class AlertNotification {
var title: String
var message: String
init(title: String, message: String) {
self.title = title
self.message = message
}
}
In this way, only VC that overrides shouldDisplayAlertNotificationwill display alert.
2. If you want to display alert on 'demand':
As suggested, extend UIViewController
extension UIViewController {
func showNotification(title: String, message: String) {
}
}
Actually you can declare a simple method anywhere outside class.
func showAlertWithCompletion(message:String,okTitle:String,cancelTitle:String?,completionBlock:#escaping (_ okPressed:Bool)->()){
let alertController = UIAlertController(title: AppName, message: message, preferredStyle: .alert)
let okAction = UIAlertAction(title: okTitle, style: .default) { (ok) in
completionBlock(true)
}
alertController.addAction(okAction)
if let cancelTitle = cancelTitle{
let cancelOption = UIAlertAction(title: cancelTitle, style: .cancel, handler: { (axn) in
completionBlock(false)
})
alertController.addAction(cancelOption)
}
if let topController = UIWindow.topViewController(){
topController.present(alertController, animated: true, completion: nil)
}
}
This way wherever you call it, you will get ok button pressed callback in completion handle or even make Extension as described by #Ganesh Kumar
Why not just an extension
extension UIViewController {
func showNotification(title: String, message: String)
{
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "تائید", style: .default, handler: nil)
alertController.addAction(defaultAction)
present(alertController, animated: true, completion: nil)
}
}
You can use this view controller extension to present alert view across the application.
https://github.com/SumitKr88/UIViewController-ShowAlertView/blob/master/UIViewController%2BExtensions.swift
extension UIViewController {
/// Show alert view
/// - Parameter title: title of alert
/// - Parameter message: message of alert
/// - Parameter actionTitles: List of action button titles(ex : "OK","Cancel" etc)
/// - Parameter style: Style of the buttons
/// - Parameter actions: actions repective to each actionTitles
/// - Parameter preferredActionIndex: Index of the button that need to be shown in bold. If nil is passed then it takes cancel as default button.
/**
Example usage:-
Just make sure actionTitles and actions array the same count.
/********** 1. Pass nil if you don't need any action handler closure. **************/
self.showAlert(title: "Title", message: "message", actionTitles: ["OK"], style: [.deafult], actions: [nil])
/*********** 2. Alert view with one action **************/
/// let okActionHandler: ((UIAlertAction) -> Void) = {(action) in
//Perform action of Ok here
}
self.showAlert(title: "Title", message: "message", actionTitles: ["OK", "CANCEL"], style: [.default, .cancel], actions: [okayActionHandler, nil])
/********** 3.Alert view with two actions **************/
let okActionHandler: ((UIAlertAction) -> Void) = {(action) in
//Perform action of ok here
}
let cancelActionHandler: ((UIAlertAction) -> Void) = {(action) in
//Perform action of cancel here
}
self.showAlert(title: "Title", message: "message", actionTitles: ["OK", "CANCEL"], style: [.default, .cancel], actions: [okActionHandler,cancelActionHandler], preferredActionIndex: 1)
*/
public func showAlert(title: String?,
message: String?,
actionTitles: [String?],
style: [UIAlertAction.Style],
actions: [((UIAlertAction) -> Void)?],
preferredActionIndex: Int? = nil) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
for (index, title) in actionTitles.enumerated() {
let action = UIAlertAction(title: title, style: style[index], handler: actions[index])
alert.addAction(action)
}
if let preferredActionIndex = preferredActionIndex { alert.preferredAction = alert.actions[preferredActionIndex] }
self.present(alert, animated: true, completion: nil)
}}
You could create extension to alertController and also have option for action handler. This will allow to use two different Alert controller based on handler is required or not.
extension UIAlertControler {
class func genericErrorAlert(forAlert message: String, completion: ((UIAlertAction) -> Void)? = nil )
let alert = UIAlertController(title: "Error", message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: completion))
return alert
}
}
You can also create one util file in your app, in that you can add any reusable method or function and use it anywhere in your app Like,
import Foundation
import UIKit
//MARK: - ALERT
func showMessage(title: String, message: String!, VC: UIViewController) {
let alert : UIAlertController = UIAlertController(title: "", message: message, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
UIAlertAction in
}
alert.addAction(okAction)
VC.present(alert, animated: true, completion: nil)
}
I have various controllers in my app that all require validation, and when validation fails, I want to display an alert with the errors. Is there some best practice/design pattern for doing this? I could simply create a static function in a Helper class like so:
static func displayAlert(message: String, buttonTitle: String, vc: UIViewController)
{
let alertController = UIAlertController(title: "", message: message, preferredStyle: .Alert)
let okAction = UIAlertAction(title: buttonTitle, style: .Default, handler: nil)
alertController.addAction(okAction)
vc.presentViewController(alertController, animated: true, completion: nil)
}
But then I need to pass the view controller..which seems like bad practice. I could shoot off a notification and observe it, but that seems like overkill. Am I overthinking this, or is there some more acceptable way to go about handling something like this?
I ended up creating an extension for UIViewController and creating the alert function there:
extension UIViewController {
func alert(message: String, title: String = "") {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
}
Swift 4
I wanted this same functionality for myself, so I made a full extension. To use it, create a new swift file in your project and name it whatever you'd like. Place the following code inside:
import UIKit
extension UIViewController {
func presentAlertWithTitle(title: String, message: String, options: String..., completion: #escaping (Int) -> Void) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
for (index, option) in options.enumerated() {
alertController.addAction(UIAlertAction.init(title: option, style: .default, handler: { (action) in
completion(index)
}))
}
self.present(alertController, animated: true, completion: nil)
}
}
To use it (which so many people don't actually show, which can lead to confusion for a newbie like myself):
presentAlertWithTitle(title: "Test", message: "A message", options: "1", "2") { (option) in
print("option: \(option)")
switch(option) {
case 0:
print("option one")
break
case 1:
print("option two")
default:
break
}
}
As original answer from itstrueimryan at https://stackoverflow.com/a/30714429/6822183
Update for Swift 3:
extension UIViewController {
func alert(message: String, title: String = "") {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
}
I may have found a better answer to this problem, via an article by Krakendev: https://krakendev.io/blog/subclassing-can-suck-and-heres-why.
The idea is to use protocol-oriented programming to create a default implementation of an alert just for UIViewControllers:
protocol Alertable {
func issueAlert()
}
extension Alertable where Self: UIViewController {
func issueAlert() {
// alert code here
}
}
Now, just like that, every UIViewController that adheres to Alertable will have the issueAlert() method available to them without even having to define its own implementation.
And, of course, we can define parameters for the issueAlert function as well:
extension Alertable where Self: UIViewController {
func issueAlert(title: "Default Title", message: String = "Default Message") {
// alert code here
}
}
So our view controller can do either:
issueAlert()
or
issueAlert(title: "Error", message: "Something went wrong")
Two advantages to this approach that I can think of are that you know if a view controller has access to this method just by looking at the Alertable protocol in the class definition, and individual view controllers can override this method if they want to provide custom functionality. Of course, now you can also specify the Alertable contract as a method parameter.
Answer from Sigex is completely fine, except the int indices passing to trace the button clicks might not make sense because, caller needed to keep track with int value. In that case passing string arguments and comparing them in switch case in completion block makes more sense to me. I would rather use like,
import UIKit
extension UIViewController {
func presentAlertWithTitle(title: String, message: String, options: String..., completion: #escaping (String) -> Void) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
for (index, option) in options.enumerated() {
alertController.addAction(UIAlertAction.init(title: option, style: .default, handler: { (action) in
completion(options[index])
}))
}
self.present(alertController, animated: true, completion: nil)
}
}
And test with,
class TestViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
presentAlertWithTitle(title: "Test", message: "A sample message", options: "start", "stop", "cancel") { (option) in
print("option: \(option)")
switch(option) {
case "start":
print("start button pressed")
break
case "stop":
print("stop button pressed")
break
case "cancel":
print("cancel button pressed")
break
default:
break
}
}
}
}
Why not create a Utility function that returns the AlertView to the ViewController?
self.presentViewController(Utilities.createAlertController("errorMessage"), animated: true, completion: nil);
Updated for swift 3:
if you want to show the alert message to user used below simple lines of code;
// function defination:
func showMessageToUser(title: String, msg: String) {
let alert = UIAlertController(title: title, message: msg, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
//function call :
self.showMessageToUser(title: "Alert", msg: "your message to user")
// Enjoy coding..!
I used Sigex's extension in my code, however I have added a check, if options were used or not.
If no options are given in the call, then the Alert only shows "OK" and completes with returning option 0.
extension UIViewController {
func presentAlertWithTitle(title: String, message: String, options: String..., completion: #escaping (Int) -> Void) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
if options.count == 0 {
let OKAction = UIAlertAction(title: "OK", style: .default, handler: { (action) in
completion(0)
})
alertController.addAction(OKAction)
} else {
for (index, option) in options.enumerated() {
alertController.addAction(UIAlertAction.init(title: option, style: .default, handler: { (action) in
completion(index)
}))
}
}
self.present(alertController, animated: true, completion: nil)
}
}
Just omit the part , options: "1","2" then default alert is shown.
I love Sigex's extension, but I spiced it up a bit to add style on button depending on the title
func presentAlertWithOptions(title: String, message: String, options: String..., completion: #escaping (Int) -> Void) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
if options.count == 0 { //if there is no options, show a basic alert
let OKAction = UIAlertAction(title: "OK", style: .default, handler: { (action) in
completion(0)
})
alertController.addAction(OKAction)
} else { //alert with options
for (index, option) in options.enumerated() {
var alertStyle = UIAlertAction.Style.default
switch option { //check if we should style the buttons
case "Cancel": //cancel style
alertStyle = .cancel
case "Logout", "Discard Changes", "Discard", "Delete", "Remove": //destructive style
alertStyle = .destructive
default: break //keep as default
}
alertController.addAction(UIAlertAction(title: option, style: alertStyle, handler: { (action) in
completion(index)
}))
}
}
self.present(alertController, animated: true, completion: nil)
}
Swift 4.1
let alert = UIAlertController(title: "Atenção",message: "Mensagem Aqui",preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
self.present(alert, animated: true)
I have been working to create a UIAlertView in Swift, but for some reason I can't get the statement right because I'm getting this error:
Could not find an overload for 'init' that accepts the supplied
arguments
Here is how I have it written:
let button2Alert: UIAlertView = UIAlertView(title: "Title", message: "message",
delegate: self, cancelButtonTitle: "OK", otherButtonTitles: nil)
Then to call it I'm using:
button2Alert.show()
As of right now it is crashing and I just can't seem to get the syntax right.
From the UIAlertView class:
// UIAlertView is deprecated. Use UIAlertController with a
preferredStyle of UIAlertControllerStyleAlert instead
On iOS 8, you can do this:
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
Now UIAlertController is a single class for creating and interacting with what we knew as UIAlertViews and UIActionSheets on iOS 8.
Edit: To handle actions:
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in
switch action.style{
case .Default:
print("default")
case .Cancel:
print("cancel")
case .Destructive:
print("destructive")
}
}}))
Edit for Swift 3:
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
Edit for Swift 4.x:
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
switch action.style{
case .default:
print("default")
case .cancel:
print("cancel")
case .destructive:
print("destructive")
}
}))
self.present(alert, animated: true, completion: nil)
One Button
class ViewController: UIViewController {
#IBAction func showAlertButtonTapped(_ sender: UIButton) {
// create the alert
let alert = UIAlertController(title: "My Title", message: "This is my message.", preferredStyle: UIAlertController.Style.alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}
}
Two Buttons
class ViewController: UIViewController {
#IBAction func showAlertButtonTapped(_ sender: UIButton) {
// create the alert
let alert = UIAlertController(title: "UIAlertController", message: "Would you like to continue learning how to use iOS alerts?", preferredStyle: UIAlertController.Style.alert)
// add the actions (buttons)
alert.addAction(UIAlertAction(title: "Continue", style: UIAlertAction.Style.default, handler: nil))
alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertAction.Style.cancel, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}
}
Three Buttons
class ViewController: UIViewController {
#IBAction func showAlertButtonTapped(_ sender: UIButton) {
// create the alert
let alert = UIAlertController(title: "Notice", message: "Lauching this missile will destroy the entire universe. Is this what you intended to do?", preferredStyle: UIAlertController.Style.alert)
// add the actions (buttons)
alert.addAction(UIAlertAction(title: "Remind Me Tomorrow", style: UIAlertAction.Style.default, handler: nil))
alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertAction.Style.cancel, handler: nil))
alert.addAction(UIAlertAction(title: "Launch the Missile", style: UIAlertAction.Style.destructive, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}
}
Handling Button Taps
The handler was nil in the above examples. You can replace nil with a closure to do something when the user taps a button. For example:
alert.addAction(UIAlertAction(title: "Launch the Missile", style: UIAlertAction.Style.destructive, handler: { action in
// do something like...
self.launchMissile()
}))
Notes
Multiple buttons do not necessarily need to use different UIAlertAction.Style types. They could all be .default.
For more than three buttons consider using an Action Sheet. The setup is very similar. Here is an example.
You can create a UIAlert using the standard constructor, but the 'legacy' one seems to not work:
let alert = UIAlertView()
alert.title = "Alert"
alert.message = "Here's a message"
alert.addButtonWithTitle("Understood")
alert.show()
In Swift 4.2 and Xcode 10
Method 1 :
SIMPLE ALERT
let alert = UIAlertController(title: "Your title", message: "Your message", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: { action in
})
alert.addAction(ok)
let cancel = UIAlertAction(title: "Cancel", style: .default, handler: { action in
})
alert.addAction(cancel)
DispatchQueue.main.async(execute: {
self.present(alert, animated: true)
})
Method 2 :
ALERT WITH SHARED CLASS
If you want Shared class style(Write once use every where)
import UIKit
class SharedClass: NSObject {//This is shared class
static let sharedInstance = SharedClass()
//Show alert
func alert(view: UIViewController, title: String, message: String) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "OK", style: .default, handler: { action in
})
alert.addAction(defaultAction)
DispatchQueue.main.async(execute: {
view.present(alert, animated: true)
})
}
private override init() {
}
}
Now call alert like this in every ware
SharedClass.sharedInstance.alert(view: self, title: "Your title here", message: "Your message here")
Method 3 :
PRESENT ALERT TOP OF ALL WINDOWS
If you want to present alert on top of all views, use this code
func alertWindow(title: String, message: String) {
DispatchQueue.main.async(execute: {
let alertWindow = UIWindow(frame: UIScreen.main.bounds)
alertWindow.rootViewController = UIViewController()
alertWindow.windowLevel = UIWindowLevelAlert + 1
let alert2 = UIAlertController(title: title, message: message, preferredStyle: .alert)
let defaultAction2 = UIAlertAction(title: "OK", style: .default, handler: { action in
})
alert2.addAction(defaultAction2)
alertWindow.makeKeyAndVisible()
alertWindow.rootViewController?.present(alert2, animated: true, completion: nil)
})
}
Function calling
SharedClass.sharedInstance.alertWindow(title:"This your title", message:"This is your message")
Method 4 :
Alert with Extension
extension UIViewController {
func showAlert(withTitle title: String, withMessage message:String) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: { action in
})
let cancel = UIAlertAction(title: "Cancel", style: .default, handler: { action in
})
alert.addAction(ok)
alert.addAction(cancel)
DispatchQueue.main.async(execute: {
self.present(alert, animated: true)
})
}
}
Now call like this
//Call showAlert function in your class
#IBAction func onClickAlert(_ sender: UIButton) {
showAlert(withTitle:"Your Title Here", withMessage: "YourCustomMessageHere")
}
Method 5 :
ALERT WITH TEXTFIELDS
If you want to add textfields to alert.
//Global variables
var name:String?
var login:String?
//Call this function like this: alertWithTF()
//Add textfields to alert
func alertWithTF() {
let alert = UIAlertController(title: "Login", message: "Enter username&password", preferredStyle: .alert)
// Login button
let loginAction = UIAlertAction(title: "Login", style: .default, handler: { (action) -> Void in
// Get TextFields text
let usernameTxt = alert.textFields![0]
let passwordTxt = alert.textFields![1]
//Asign textfileds text to our global varibles
self.name = usernameTxt.text
self.login = passwordTxt.text
print("USERNAME: \(self.name!)\nPASSWORD: \(self.login!)")
})
// Cancel button
let cancel = UIAlertAction(title: "Cancel", style: .destructive, handler: { (action) -> Void in })
//1 textField for username
alert.addTextField { (textField: UITextField) in
textField.placeholder = "Enter username"
//If required mention keyboard type, delegates, text sixe and font etc...
//EX:
textField.keyboardType = .default
}
//2nd textField for password
alert.addTextField { (textField: UITextField) in
textField.placeholder = "Enter password"
textField.isSecureTextEntry = true
}
// Add actions
alert.addAction(loginAction)
alert.addAction(cancel)
self.present(alert, animated: true, completion: nil)
}
Method 6:
Alert in SharedClass with Extension
//This is your shared class
import UIKit
class SharedClass: NSObject {
static let sharedInstance = SharedClass()
//Here write your code....
private override init() {
}
}
//Alert function in shared class
extension UIViewController {
func showAlert(title: String, msg: String) {
DispatchQueue.main.async {
let alert = UIAlertController(title: title, message: msg, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}
}
Now call directly like this
self.showAlert(title: "Your title here...", msg: "Your message here...")
Method 7:
Alert with out shared class with Extension in separate class for alert.
Create one new Swift class, and import UIKit. Copy and paste below code.
//This is your Swift new class file
import UIKit
import Foundation
extension UIAlertController {
class func alert(title:String, msg:String, target: UIViewController) {
let alert = UIAlertController(title: title, message: msg, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default) {
(result: UIAlertAction) -> Void in
})
target.present(alert, animated: true, completion: nil)
}
}
Now call alert function like this in all your classes (Single line).
UIAlertController.alert(title:"Title", msg:"Message", target: self)
How is it....
Click of View
#IBAction func testClick(sender: UIButton) {
var uiAlert = UIAlertController(title: "Title", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
self.presentViewController(uiAlert, animated: true, completion: nil)
uiAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { action in
println("Click of default button")
}))
uiAlert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { action in
println("Click of cancel button")
}))
}
Done with two buttons OK & Cancel
If you're targeting iOS 7 and 8, you need something like this to make sure you're using the right method for each version, because UIAlertView is deprecated in iOS 8, but UIAlertController is not available in iOS 7:
func alert(title: String, message: String) {
if let getModernAlert: AnyClass = NSClassFromString("UIAlertController") { // iOS 8
let myAlert: UIAlertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
myAlert.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
self.presentViewController(myAlert, animated: true, completion: nil)
} else { // iOS 7
let alert: UIAlertView = UIAlertView()
alert.delegate = self
alert.title = title
alert.message = message
alert.addButtonWithTitle("OK")
alert.show()
}
}
With the protocol extensions of Swift 2, you can make a protocol that provides a default implementation to your view controllers:
ShowsAlert.swift
import UIKit
protocol ShowsAlert {}
extension ShowsAlert where Self: UIViewController {
func showAlert(title: String = "Error", message: String) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))
presentViewController(alertController, animated: true, completion: nil)
}
}
ViewController.swift
class ViewController: UIViewController, ShowsAlert {
override func viewDidLoad() {
super.viewDidLoad()
showAlert(message: "Hey there, I am an error message!")
}
}
Show UIAlertView in swift language :-
Protocol UIAlertViewDelegate
let alert = UIAlertView(title: "alertView", message: "This is alertView", delegate:self, cancelButtonTitle:"Cancel", otherButtonTitles: "Done", "Delete")
alert.show()
Show UIAlertViewController in swift language :-
let alert = UIAlertController(title: "Error", message: "Enter data in Text fields", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
Simply do not provide otherButtonTitles in the constructor.
let alertView = UIAlertView(title: "Oops!", message: "Something
happened...", delegate: nil, cancelButtonTitle: "OK")
alertView.show()
But I do agree with Oscar, this class is deprecated in iOS 8, so there won't be no use of UIAlertView if you're doing an iOS 8 only app. Otherwise the code above will work.
For SWIFT4, I think, extending UIViewController and creating a reusable confirmation control is the most elegant way.
You can extend the UIViewController as below:
extension UIViewController {
func AskConfirmation (title:String, message:String, completion:#escaping (_ result:Bool) -> Void) {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
self.present(alert, animated: true, completion: nil)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { action in
completion(true)
}))
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { action in
completion(false)
}))
}
}
Then you can use it anytime:
AskConfirmation(title: "YOUR MESSAGE TITLE", message: "YOUR MESSAGE") { (result) in
if result { //User has clicked on Ok
} else { //User has clicked on Cancel
}
}
AlertView Swift 5 and above:-
let alert = UIAlertController(title: LocalizedStringConstant.alert, message: message, preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "Retry", style: .cancel, handler: { (_) in
}))
self.present(alert, animated: true, completion: nil)
I found this one,
var alertView = UIAlertView();
alertView.addButtonWithTitle("Ok");
alertView.title = "title";
alertView.message = "message";
alertView.show();
not good though, but it works :)
Update:
but I have found on header file as:
extension UIAlertView {
convenience init(title: String, message: String, delegate: UIAlertViewDelegate?, cancelButtonTitle: String?, otherButtonTitles firstButtonTitle: String, _ moreButtonTitles: String...)
}
somebody may can explain this.
For iOS 13 Xcode 11+ Swift 5.X
UIAlertController can now provide Alerts as well as Action Sheets
Alerts
// First instantiate the UIAlertController
let alert = UIAlertController(title: "Title",
message: "Message ?",
preferredStyle: .alert)
// Add action buttons to it and attach handler functions if you want to
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
alert.addAction(UIAlertAction(title: "Just Do It!", style: .destructive, handler: nil))
alert.addAction(UIAlertAction(title: "Maybe", style: .default, handler: nil))
// Show the alert by presenting it
self.present(alert, animated: true)
Note that it's is a fundamental nature for all action buttons to dismiss the alert view when tapped. The style parameter is just for deciding the color of the text (and some default order in which the buttons should appear which ofc can be changed)
A sample handler function could be
func handler(_ action: UIAlertAction) {
if action.title == 'Title' {
// do stuff
}
}
As a side note, I would say instead of making 3 different handlers you can just make 1 and trace back to the element which provoked it in the manner shown above
We can also check alert.style but that again we can have multiple .default styled actions , I wouldn't recommend that
Action Sheets
The explanation is similar because the main difference here is that an alert interrupts the user whereas an action sheet slides from the bottom in an iPhone and appears as a popover in an iPad
The Purpose of action sheets is to guide the users in deciding his actions based on their current state. So you gotta treat action sheets like crossroads !. There is generally no message and the title is rendered as caption sized text
let action = UIAlertController(title: "What do you want to do with the message",
message: nil,
preferredStyle: .actionSheet)
action.addAction(UIAlertAction(title: "Cancel", style: .cancel))
for act in ["Save", "Post", "Discard"] {
action.addAction(UIAlertAction(title: act, style: .default, handler: nil))
}
self.present(action, animated: true)
The above code is going to work for an iPhone but will crash at runtime for an iPad because UIPopoverPresentationController is going to take charge of the alert and it won't be referencing anything at that time. So to avoid that you will have to provide the following chunk of code its mandatory
if let pop = action.popoverPresentationController {
let v = sender as! UIView
pop.sourceView = v
pop.sourceRect = v.bounds
}
Also in case of iPad tapping on anywhere outside the popover will dismiss it and the completion handler of .cancel action button will be called.
Hope that helps :) That being said, comment down below if you have any doubts
class Preview: UIViewController , UIAlertViewDelegate
{
#IBAction func MoreBtnClicked(sender: AnyObject)
{
var moreAlert=UIAlertView(title: "Photo", message: "", delegate: self, cancelButtonTitle: "No Thanks!", otherButtonTitles: "Save Image", "Email", "Facebook", "Whatsapp" )
moreAlert.show()
moreAlert.tag=111;
}
func alertView(alertView: UIAlertView, didDismissWithButtonIndex buttonIndex: Int)
{
if alertView.tag==111
{
if buttonIndex==0
{
println("No Thanks!")
}
else if buttonIndex==1
{
println("Save Image")
}
else if buttonIndex == 2
{
println("Email")
}
else if buttonIndex == 3
{
println("Facebook")
}
else if buttonIndex == 4
{
println("Whatsapp")
}
}
}
}
I have another trick. Suppose you have 5 classes where a logout alert to be applied. Try with swift class extension.
File- New- Swift class- Name it.
Add the following:
public extension UIViewController
{
func makeLogOutAlert()
{
var refreshAlert = UIAlertController(title: "Log Out", message: "Are You Sure to Log Out ? ", preferredStyle: UIAlertControllerStyle.Alert)
refreshAlert.addAction(UIAlertAction(title: "Confirm", style: .Default, handler: { (action: UIAlertAction!) in
self.navigationController?.popToRootViewControllerAnimated(true)
}))
refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Default, handler: { (action: UIAlertAction!) in
refreshAlert .dismissViewControllerAnimated(true, completion: nil)
}))
presentViewController(refreshAlert, animated: true, completion: nil)
}
}
Implement using : self.makeLogOutAlert(). Hope it helps.
I have made a singleton class to make this convenient to use from anywhere in your app: https://github.com/Swinny1989/Swift-Popups
You can then create a popup with multiple buttons like this:
Popups.SharedInstance.ShowAlert(self, title: "Title goes here", message: "Messages goes here", buttons: ["button one" , "button two"]) { (buttonPressed) -> Void in
if buttonPressed == "button one" {
//Code here
} else if buttonPressed == "button two" {
// Code here
}
}
or popups with a single button like this:
Popups.SharedInstance.ShowPopup("Title goes here", message: "Message goes here.")
Swift 3
The following is a simple example of how to create a simple alert with one button with Swift 3.
let alert = UIAlertController(title: "Title",
message: "Message",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default))
present(alert, animated: true)
In the above example the handle callback of the action has been omitted because the default behaviour of an alert view with one button is to disappear when the button is clicked.
Here is how to create another action, which could be added to the alert with "alert.addAction(action)". The different styles are .default, .destructive and .cancel.
let action = UIAlertAction(title: "Ok", style: .default) { action in
// Handle when button is clicked
}
I got the following UIAlertView initialization code to compile without errors (I thing the last, varyadic part is tricky perhaps). But I had to make sure the class of self (which I am passing as the delegate) was adopting the UIAlertViewDelegate protocol for the compile errors to go away:
let alertView = UIAlertView(
title: "My Title",
message: "My Message",
delegate: self,
cancelButtonTitle: "Cancel",
otherButtonTitles: "OK"
)
By the way, this is the error I was getting (as of Xcode 6.4):
Cannot find an initializer for type 'UIAlertView' that accepts an
argument list of type '(title: String, message: String, delegate:
MyViewController, cancelButtonTitle: String, otherButtonTitles:
String)'
As others mentioned, you should migrate to UIAlertController if you can target iOS 8.x+. To support iOS 7, use the code above (iOS 6 is not supported by Swift).
let alertController = UIAlertController(title: "Select Photo", message: "Select atleast one photo", preferredStyle: .alert)
let action1 = UIAlertAction(title: "From Photo", style: .default) { (action) in
print("Default is pressed.....")
}
let action2 = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
print("Cancel is pressed......")
}
let action3 = UIAlertAction(title: "Click new", style: .default) { (action) in
print("Destructive is pressed....")
}
alertController.addAction(action1)
alertController.addAction(action2)
alertController.addAction(action3)
self.present(alertController, animated: true, completion: nil)
}
You can use this simple extension with n number of buttons and associated actions swift4 and above
extension UIViewController {
func popupAlert(title: String?, message: String?, actionTitles:[String?], actions:[((UIAlertAction) -> Void)?]) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
for (index, title) in actionTitles.enumerated() {
let action = UIAlertAction(title: title, style: .default, handler: actions[index])
alert.addAction(action)
}
self.present(alert, animated: true, completion: nil)
}
}
you can use it like ,
self.popupAlert(title: "Message", message: "your message", actionTitles: ["first","second","third"], actions:[
{action1 in
//action for first btn click
},
{action2 in
//action for second btn click
},
{action3 in
//action for third btn click
}, nil])
The reason it doesn't work because some value you passed to the function isn't correct. swift doesn't like Objective-C, you can put nil to arguments which are class type without any restriction(might be). Argument otherButtonTitles is defined as non-optional which its type do not have (?)at its end. so you must pass a concrete value to it.
#IBAction func Alert(sender: UIButton) {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Alert!"
alertView.message = "Message"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
Try this
Use this code to display an alertview
let alertController = UIAlertController(title: "Hello Coders", message: "your alert message", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "Close Alert", style: .Default, handler: nil)
alertController.addAction(defaultAction)
presentViewController(alertController, animated: true, completion: nil)
Reference: Swift Show Alert using UIAlertController
in xcode 9
let alert = UIAlertController(title: "Alert", message: "message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
SWIFT 4 : Simply create a extension to UIViewController as follows:
extension UIViewController {
func showSuccessAlert(withTitle title: String, andMessage message:String) {
let alert = UIAlertController(title: title, message: message,
preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "OK".localized, style:
UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}
Now in your ViewController, directly call above function as if they are provided by UIViewController.
yourViewController.showSuccessAlert(withTitle:
"YourTitle", andMessage: "YourCustomTitle")
Or just do this
let alert = UIAlertController(title: "Alert", message: "Saved Successfully", preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
try This.
Put Bellow Code In Button.
let alert = UIAlertController(title: "Your_Title_Text", message: "Your_MSG", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Your_Text", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated:true, completion: nil)
Here is a funny example in Swift:
private func presentRandomJoke() {
if let randomJoke: String = jokesController.randomJoke() {
let alertController: UIAlertController = UIAlertController(title:nil, message:randomJoke, preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title:"Done", style:UIAlertActionStyle.Default, handler:nil))
presentViewController(alertController, animated:true, completion:nil)
}
}
Here is a pretty simple function of AlertView in Swift :
class func globalAlertYesNo(msg: String) {
let alertView = UNAlertView(title: "Title", message: msg)
alertView.messageAlignment = NSTextAlignment.Center
alertView.buttonAlignment = UNButtonAlignment.Horizontal
alertView.addButton("Yes", action: {
print("Yes action")
})
alertView.addButton("No", action: {
print("No action")
})
alertView.show()
}
You have to pass message as a String where you use this function.
The Old Way: UIAlertView
let alertView = UIAlertView(title: "Default Style", message: "A standard alert.", delegate: self, cancelButtonTitle: "Cancel", otherButtonTitles: "OK")
alertView.alertViewStyle = .Default
alertView.show()
// MARK: UIAlertViewDelegate
func alertView(alertView: UIAlertView, clickedButtonAtIndex buttonIndex: Int) {
switch buttonIndex {
// ...
}
}
The New Way: UIAlertController
let alertController = UIAlertController(title: "Default Style", message: "A standard alert.", preferredStyle: .Alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) in
// ...
}
alertController.addAction(cancelAction)
let OKAction = UIAlertAction(title: "OK", style: .Default) { (action) in
// ...
}
alertController.addAction(OKAction)
self.presentViewController(alertController, animated: true) {
// ...
}