Related
in the simple language: can we create that alert Box as a reusable method
i want to made 1 Alert box in to the function.
like this.
// this code has separate file
import UIKit
struct AlertView {
public func showAlertBox(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: { _ in
}))
return alert
}
}
and here is my caller ViewController file code.
#IBAction func submitPressed(_ sender: Any) {
let alertView = AlertView()
let alert = alertView.showAlertBox(title: "Hours Added", message: "Hours have been updated")
alert.present(alert, animated: true) {
self?.dismiss(animated: true, completion: nil)
self?.timeSubmitted = true
self?.performSegue(withIdentifier: "unwindToMyHours", sender: nil)
}
}
You need alert action to performing ok action.
You can modify your code by this
Here are the helper functions.
struct AlertView {
public static func showAlertBox(title: String, message: String, handler: ((UIAlertAction)->Void)?) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: handler))
return alert
}
}
extension UIAlertController {
func present(on viewController: UIViewController, completion: (() -> Void)? = nil) {
viewController.present(self, animated: true, completion: completion)
}
}
Usage
class ViewController: UIViewController {
#IBAction func submitPressed(_ sender: Any) {
AlertView.showAlertBox(title: "Hours Added", message: "Hours have been updated") { [weak self] action in
// Okay action code
}.present(on: self) { [weak self] in
self?.dismiss(animated: true, completion: nil)
self?.timeSubmitted = true
self?.performSegue(withIdentifier: "unwindToMyHours", sender: nil)
}
}
}
Note: self is dismissing so might be your alert is not presenting. You can present your alert on top most view controller. see this
Yes, you can create a shared alert controller. I would suggest making it a static method of your struct, or even a global function. It's silly to create an instance of your struct only to invoke a method that doesn't need any instance variables:
public static func alertBox(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: { _ in
}))
return alert
}
}
And then you'd invoke it by saying
let alert = AlertView.alertBox(title: "title",message: "message" )
(Your function doesn't show the alert, it just creates it. I would therefore suggest naming it alertBox, not 'showAlertBox`.
Yes, you can use a shared alert controller. What I would suggest is making the AlertView struct, a singleton. You can change the struct as follows
struct AlertView {
// Shared instance
static let shared: AlertView = AlertView()
// Private initializer to prevent creating of new instances
private init() {}
public func showAlertBox(title: String, message: String) -> UIAlertController {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: { _ in
}))
return alert
}
}
By doing so, you will be able to create just one instance of AlertView and you have to use that single instance in your program. That way you won't have to create new instances of AlertView every time you need to display an alert. You can invoke it using,
let alert = AlertView.shared.showAlertBox(title: "Hours Added", message: "Hours have been updated")
Edit - You can refer this medium article to understand the singleton design patter
The best way is to perform simple encapsulation through extension, and complex encapsulation just loses applicability
example:
let alertVC = UIAlertController(title: "title", message: "message", preferredStyle: .alert)
.addActionTitles(titles) { (alertVC, action) in
let actionIdx = alertVC.actions.firstIndex(of: action)
DDLog(actionIdx)
}
self.present(alertVC, animated: true, completion:{})
code:
public let kTitleSure = "Yes"
public let kTitleCancell = "No"
/// contentViewController
public let kAlertContentViewController = "contentViewController"
#objc public extension UIAlertController{
///add UIAlertAction
#discardableResult
func addActionTitles(_ titles: [String]? = [kTitleCancell, kTitleSure], handler: ((UIAlertController, UIAlertAction) -> Void)? = nil) -> Self {
titles?.forEach({ (string) in
let style: UIAlertAction.Style = string == kTitleCancell ? .cancel : .default
self.addAction(UIAlertAction(title: string, style: style, handler: { (action) in
handler?(self, action)
}))
})
return self
}
///add textField
#discardableResult
func addTextFieldPlaceholders(_ placeholders: [String]?, handler: ((UITextField) -> Void)? = nil) -> Self {
if self.preferredStyle != .alert {
return self
}
placeholders?.forEach({ (string) in
self.addTextField { (textField: UITextField) in
textField.placeholder = string
handler?(textField)
}
})
return self
}
#discardableResult
func setContent(vc: UIViewController, height: CGFloat) -> Self {
setValue(vc, forKey: kAlertContentViewController)
vc.preferredContentSize.height = height
preferredContentSize.height = height
return self
}
}
github
I declared a global variable for UIAlertViewController for me to be able to show and dismiss it in different method inside my class.
I displayed two kinds of alert: First, alert with button which will be displayed when an error is encountered or to display an information message. Second is an alert without button which will be displayed like a progress message.
Here is the sample code:
private var alert: UIAlertController? // global declaration
private func showProgressMessage(sender viewController: UIViewController, message alertMessage: String)
{
DispatchQueue.main.async
{
self.alert= UIAlertController(title: "", message: alertMessage, preferredStyle: .alert)
viewController.present(self.alert!, animated: true, completion: nil)
}
}
private func showAlertMessage(sender viewController: UIViewController, title alertTitle: String, message alertMessage: String)
{
DispatchQueue.main.async
{
self.alert= UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .alert)
self.alert!.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
viewController.present(self.alert!, animated: true, completion: nil)
}
}
private func method1()
{
DispatchQueue.global().async
{
// some code here
self.showProgressMessage(sender: self, message: "Processing...")
// some code here
}
}
private func method2()
{
// some code here
self.alert!.dismiss(animated: false)
{
self.showAlertMessage(sender: self, message: "Done")
}
self.displayOtherViewController()
}
private func displayOtherViewController()
{
self.alert?.dismiss(animated: false)
{
if let viewController = self.storyboard?.instantiateViewController(withIdentifier: "Sample")
{
let view = viewController as! SampleViewController
view .modalTransitionStyle = .crossDissolve
self.present(view , animated: true, completion: nil)
}
}
}
In method2, displaying the alert again will take a few seconds to display, same with the view controller.
What is the proper way to show and dismis the UIAlertController in Swift 4?
Seems like your code is initiated from a background thread.
Even dismiss must be called on main thread
Try this:
private func method2() {
DispatchQueue.main.async {
self.alert!.dismiss(animated: false) {
self.showAlertMessage(sender: self, message: "Done")
}
self.displayOtherViewController()
}
}
I created a Utilities class to hold some common functions, one of which is an alertUser function that if called, will display an Alert box to the user with the provided title and message text. In another class file, I am validating some text field entries and if the validation doesn't pass, then I want to use the alertUser function from the Utilities class. However, when I do this, I get the following error message in the Xcode log:
Warning: Attempt to present <UIAlertController: 0x7f9c4be0b140> on <MyAppName.Utilities: 0x7f9c4be1cb60> whose view is not in the window hierarchy!
The calling code is in a UIViewController class file. Here's the code which is in the
class ItemSettingsVC: UIViewController:
private func validateNameField() -> Bool {
var passed = false
if (nameField.hasText) {
passed = true
} else {
Utilities().alertUser(strTitle: "Alert", strMessage: strInvalidNameFieldErrorMsg)
passed = false
}
return passed
}
Here's the alertUser function which is in the
class Utilities: UIViewController:
public func alertUser(strTitle: String, strMessage: String) {
let myAlert = UIAlertController(title: strTitle, message: strMessage, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)
myAlert.addAction(okAction)
self.present(myAlert, animated: true, completion: nil)
}
This is running on iOS. I'm using Xcode 8 and swift 3. Any help is greatly appreciated. Thanks.
This should do it:
public func alertUser(strTitle: String, strMessage: String) {
let myAlert = UIAlertController(title: strTitle, message: strMessage, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)
myAlert.addAction(okAction)
UIApplication.shared.delegate?.window??.rootViewController?.present(myAlert, animated: true, completion: nil)
}
You have to add an additional parameter in your alertUser function, which would be the VC that will present the alert controller.
for example:
public func alertUser(strTitle: String, strMessage: String, viewController: UIViewController) {
let myAlert = UIAlertController(title: strTitle, message: strMessage, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)
myAlert.addAction(okAction)
viewController.present(myAlert, animated: true, completion: nil)
}
But I would recommend that you just make an extension of UIViewController and add your func alertUser()* there because you would surely use this alertUser in different VCs and complexity wise in my opinion, this would be more optimized.
Like this:
extension UIViewController {
func showAlert(title: String, message: String, callback: #escaping () -> ()) {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: {
alertAction in
callback()
}))
self.present(alert, animated: true, completion: nil)
}
//add additional functions here if necessary
//like a function showing alert with cancel
}
NOTE : Please don't make your Utilities class a subclass of UIViewController, it would also be better to make it a struct handling static functions and/or variables
Use this class for easy to show Alert or ActionSheet
UIAlertController Extension
public extension UIAlertController {
public func showAlert(animated: Bool = true, completionHandler: (() -> Void)? = nil) {
guard let rootVC = UIApplication.shared.keyWindow?.rootViewController else {
return
}
var forefrontVC = rootVC
while let presentedVC = forefrontVC.presentedViewController {
forefrontVC = presentedVC
}
forefrontVC.present(self, animated: animated, completion: completionHandler)
}
}
AppAlert Class Create For UIAlertController Show
public class AppAlert {
private var alertController: UIAlertController
public init(title: String? = nil, message: String? = nil, preferredStyle: UIAlertControllerStyle) {
self.alertController = UIAlertController(title: title, message: message, preferredStyle: preferredStyle)
}
public func setTitle(_ title: String) -> Self {
alertController.title = title
return self
}
public func setMessage(_ message: String) -> Self {
alertController.message = message
return self
}
public func setPopoverPresentationProperties(sourceView: UIView? = nil, sourceRect:CGRect? = nil, barButtonItem: UIBarButtonItem? = nil, permittedArrowDirections: UIPopoverArrowDirection? = nil) -> Self {
if let poc = alertController.popoverPresentationController {
if let view = sourceView {
poc.sourceView = view
}
if let rect = sourceRect {
poc.sourceRect = rect
}
if let item = barButtonItem {
poc.barButtonItem = item
}
if let directions = permittedArrowDirections {
poc.permittedArrowDirections = directions
}
}
return self
}
public func addAction(title: String = "", style: UIAlertActionStyle = .default, handler: #escaping ((UIAlertAction!) -> Void) = { _ in }) -> Self {
alertController.addAction(UIAlertAction(title: title, style: style, handler: handler))
return self
}
public func addTextFieldHandler(_ handler: #escaping ((UITextField!) -> Void) = { _ in }) -> Self {
alertController.addTextField(configurationHandler: handler)
return self
}
public func build() -> UIAlertController {
return alertController
}
}
Used For Open AlertBox
AppAlert(title: "Question", message: "Are you sure?", preferredStyle: .alert)
.addAction(title: "NO", style: .cancel) { _ in
// action
}
.addAction(title: "Okay", style: .default) { _ in
// action
}
.build()
.showAlert(animated: true)
Used For ActionSheet Open
if UIDevice.current.userInterfaceIdiom != .pad {
// Sample to show on iPhone
AppAlert(title: "Question", message: "Are you sure?", preferredStyle: .actionSheet)
.addAction(title: "NO", style: .cancel) {_ in
print("No")
}
.addAction(title: "YES", style: .default) { _ in
print("Yes")
}
.build()
.showAlert(animated: true)
} else {
// Sample to show on iPad
AppAlert(title: "Question", message: "Are you sure?", preferredStyle: .actionSheet)
.addAction(title: "Not Sure", style: .default) {
_ in
print("No")
}
.addAction(title: "YES", style: .default) { _ in
print("Yes")
}
.setPopoverPresentationProperties(sourceView: self, sourceRect: CGRect.init(x: 0, y: 0, width: 100, height: 100), barButtonItem: nil, permittedArrowDirections: .any)
.build()
.showAlert(animated: true)
}
First find out the topmost viewController on your window .
Get the top ViewController in iOS Swift
and then present your alert on that viewController.No need to pass any parameter.
public func alertUser(strTitle: String, strMessage: String) {
let myAlert = UIAlertController(title: strTitle, message: strMessage, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)
myAlert.addAction(okAction)
topmostVC().present(myAlert, animated: true, completion: nil)
}
I'm trying to create uialertcontroller in Config.swift file as follow.
static func showAlertMessage(titleStr:String, messageStr:String) -> Void {
let window : UIWindow?
let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
self.window!.presentViewController(alert, animated: true, completion: nil)
}
problem is I've found problem in self.window!.
Type 'Config' has no member 'window'
Please let me know how to solve that issue.
swift
Here's what I used, this is the same as #penatheboss answered, just add the ability of adding actions and handlers.
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)
}
}
Just make sure actionTitles and actions array the same count. Pass nil if you don't need any action handler closure.
self.popupAlert(title: "Title", message: " Oops, xxxx ", actionTitles: ["Option1","Option2","Option3"], actions:[{action1 in
},{action2 in
}, nil])
Objective C:
Add the category for UIViewController
UIViewController+PopAlert.h
#import <UIKit/UIKit.h>
#interface UIViewController (UIViewControllerCategory)
- (void) popAlertWithTitle: (NSString*) title message: (NSString*) message actionTitles:(NSArray *) actionTitles actions:(NSArray*)actions;
#end
UIViewController+PopAlert.m
#import "UIViewController+PopAlert.h"
#implementation UIViewController (UIViewControllerCategory)
- (void) popAlertWithTitle: (NSString*) title message: (NSString*) message actionTitles:(NSArray *) actionTitles actions:(NSArray*)actions {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
[actionTitles enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
UIAlertAction *action = [UIAlertAction actionWithTitle:obj style:UIAlertActionStyleDefault handler:actions[idx]];
[alert addAction:action];
}];
[self presentViewController:alert animated:YES completion:nil];
}
#end
Usage:
#import UIViewController+PopAlert.h
...
[super viewDidDisappear:animated];
NSArray *actions = #[^(){NSLog(#"I am action1");}, ^(){NSLog(#"I am action2");}];
[self popAlertWithTitle:#"I am title" message:#"good" actionTitles:#[#"good1", #"good2"] actions:actions];
self.window would mean that there's a window object in this class, and it's not the case.
You would need to use your let window : UIWindow? with window?.presentViewController(alert, animated: true, completion: nil), but this won't help, since this window does not actually represent any existing window, and it's not a view controller anyway.
So I suggest you pass the actual view controller you'll be using to the method:
static func showAlertMessage(vc: UIViewController, titleStr:String, messageStr:String) -> Void {
let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
vc.presentViewController(alert, animated: true, completion: nil)
}
and you call it from a class where a UIViewController object is available.
Details
Swift 5.1, Xcode 11.3.1
Global UIAlertController With UIViewController Extension
extension UIViewController{
// Global Alert
// Define Your number of buttons, styles and completion
public func openAlert(title: String,
message: String,
alertStyle:UIAlertController.Style,
actionTitles:[String],
actionStyles:[UIAlertAction.Style],
actions: [((UIAlertAction) -> Void)]){
let alertController = UIAlertController(title: title, message: message, preferredStyle: alertStyle)
for(index, indexTitle) in actionTitles.enumerated(){
let action = UIAlertAction(title: indexTitle, style: actionStyles[index], handler: actions[index])
alertController.addAction(action)
}
self.present(alertController, animated: true)
}
}
Usage
Alert
self.openAlert(title: "alert",
message: "add your message",
alertStyle: .alert,
actionTitles: ["Okay", "Cancel"],
actionStyles: [.default, .cancel],
actions: [
{_ in
print("okay click")
},
{_ in
print("cancel click")
}
])
ActionSheet
self.openAlert(title: "actionsheet",
message: "add your message",
alertStyle: .actionSheet,
actionTitles: ["Okay", "Cancel"],
actionStyles: [.default, .cancel],
actions: [
{_ in
print("okay click")
},
{_ in
print("cancel click")
}
])
I suggest creating an extension:
extension UIViewController {
func showAlertMessage(titleStr:String, messageStr:String) {
let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert)
self.presentViewController(alert, animated: true, completion: nil)
}
}
You can try this, please add below code in AppDelegate.swift file.
static func showAlertView(vc : UIViewController, titleString : String , messageString: String) ->()
{
let alertView = UIAlertController(title: titleString, message: messageString, preferredStyle: .alert)
let alertAction = UIAlertAction(title: "ok", style: .cancel) { (alert) in
vc.dismiss(animated: true, completion: nil)
}
alertView.addAction(alertAction)
vc.present(alertView, animated: true, completion: nil)
}
and call showAlertView method from any viewcontroller
AppDelegate.showAlertView(vc: self, titleString: "testTitle", messageString: "test msg")
I am suggest you write this code, but if you really need, try this:
static func showAlertMessage(titleStr:String, messageStr:String) -> Void {
let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
if let viewController = UIApplication.sharedApplication().windows.first?.rootViewController as UIViewController? {
viewController.presentViewController(alert, animated: true, completion: nil)
}
}
At least it won't break down.
#Eric D better answer.
I created a alerMessage class .I can call any where in my application
//Common Alert Message Class
class AlertMessage {
internal static var alertMessageController:UIAlertController!
internal static func disPlayAlertMessage(titleMessage:String, alertMsg:String){
AlertMessage.alertMessageController = UIAlertController(title: titleMessage, message:
alertMsg, preferredStyle: UIAlertControllerStyle.Alert)
AlertMessage.alertMessageController.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default,handler: nil))
if let controller = UIApplication.sharedApplication().keyWindow?.rootViewController?.presentedViewController {
controller.presentViewController(AlertMessage.alertMessageController, animated: true, completion: nil)
}
else{
UIApplication.sharedApplication().delegate?.window!!.rootViewController?.presentViewController(AlertMessage.alertMessageController, animated: true, completion: nil)
}
return
}
}
Please refer the below GIT Example
https://github.com/amilaim/CommonAlertView
// ViewController.swift
// CommonAlertView
//
// Created by Amila Munasinghe on 4/25/17.
// Copyright © 2017 Developer Insight. All rights reserved.
//
import UIKit
class ViewController: UIViewController,AlertViewControllerDelegate {
#IBOutlet weak var AlertViewResultTextOutlet: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func ShowAlertAction(_ sender: Any) {
let alert = AlertViewController.sharedInstance
alert.delegate = self
alert.SubmitAlertView(viewController: self,title: "Developer Insight", message: "Please enter any text value")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func SubmitAlertViewResult(textValue : String) {
AlertViewResultTextOutlet.text = textValue
}
}
Common UIAlertViewController Implementation
import UIKit
protocol AlertViewControllerDelegate {
func SubmitAlertViewResult(textValue : String)
}
class AlertViewController {
static let sharedInstance = AlertViewController()
private init(){}
var delegate : AlertViewControllerDelegate?
func SubmitAlertView(viewController : UIViewController,title : String, message : String){
let alert = UIAlertController(title: title,
message: message,
preferredStyle: .alert)
// Submit button
let submitAction = UIAlertAction(title: "Submit", style: .default, handler: { (action) -> Void in
// Get 1st TextField's text
let textField = alert.textFields![0]
if(textField.text != "")
{
self.delegate?.SubmitAlertViewResult(textValue: textField.text!)
}
})
// Cancel button
let cancel = UIAlertAction(title: "Cancel", style: .destructive, handler: { (action) -> Void in })
// Add 1 textField and cutomize it
alert.addTextField { (textField: UITextField) in
textField.keyboardAppearance = .dark
textField.keyboardType = .default
textField.autocorrectionType = .default
textField.placeholder = "enter any text value"
textField.clearButtonMode = .whileEditing
}
// Add action buttons and present the Alert
alert.addAction(submitAction)
alert.addAction(cancel)
viewController.present(alert, animated: true, completion: nil)
}
}
What I'm using based on the solution by #William Hu:
func popup(caller:UIViewController, style:UIAlertControllerStyle? = UIAlertControllerStyle.alert,
title:String, message:String, buttonTexts:[String], buttonStyles:([UIAlertActionStyle?])? = nil,
handlers:[((UIAlertAction) -> Void)?], animated:Bool? = nil, completion: (() -> Void)? = nil) {
let alert = UIAlertController(title: title, message: message, preferredStyle: style!)
for i in 0..<buttonTexts.count {
alert.addAction(UIAlertAction(title: buttonTexts[i],
style: (buttonStyles == nil || i >= buttonStyles!.count || buttonStyles![i] == nil ?
UIAlertActionStyle.default : buttonStyles![i]!),
handler: (i >= handlers.count || handlers[i] == nil ? nil : handlers[i]!)))
}
caller.present(alert, animated: animated != nil ? animated! : true, completion: completion)
}
Single function gives Alert by default and can optionally be used for ActionSheet.
Arrays buttonTexts, buttonStyles and handlers can be of unequal sizes as per requirement.
Actions can be styled.
Animated can be specified.
Optional block can be specified to be executed when presentation finishes.
Usage:
popup(caller: self, style: UIAlertControllerStyle.alert,
title: "Title", message: "Message",
buttonTexts: ["Destructive", "Cancel", "OK"],
buttonStyles: [UIAlertActionStyle.destructive, UIAlertActionStyle.cancel],
handlers: [nil], animated: false)
You can use my Utility class created for Show Alert in Swift4. Its super easy to use just by writing single line of code:
Show Simple Alert
#IBAction func showDefaultAlert(_ sender: Any) {
Alert.showAlert(title:"Alert", message:"Default Alert")
}
Demo code link: https://github.com/smindia1988/EasyAlertInSwift4
If you want to present from AppDelegate windows you can use like this
UIApplication.sharedApplication().delegate?.window.rootViewController?.presentViewController(vc, animated: true, completion: nil)
This is also the way you can present on top of the View Controller available.
UIApplication.topViewController()?.present(alertViewController!, animated: true, completion: nil)
Here is my code
import Foundation
import UIKit
class Alert: UIViewController {
class func showAlert(title: String, message: String, buttonTitle: String? = nil, buttonTitle2: String? = nil, sender: UIViewController) -> Int? {
var flag : Int?
func yes(){
flag = 1
}
func no(){
flag = 0
}
//= nil ;
if objc_getClass("UIAlertController") != nil {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
if (buttonTitle != nil){
alert.addAction(UIAlertAction(title: buttonTitle, style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) in
yes()
}))
}
if (buttonTitle2 != nil) {
alert.addAction(UIAlertAction(title: buttonTitle2, style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) in
no()
}))
}
sender.presentViewController(alert, animated: true, completion: nil)
return flag
} else {
let alert = UIAlertView()
alert.title = title
alert.message = message
alert.addButtonWithTitle(buttonTitle)
alert.addButtonWithTitle(buttonTitle2)
print("inside Else")
alert.show()
return flag
//make and use a UIAlertView
}
}
}
The problem is that the flag getting returned is always nil to the view controller I call Alert from. I need the flag to return 1 if "yes" is pressed and 0 if "No" is pressed. I have been stuck in this problem for lot of time. Help.
Try this code,
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func showAlert() {
let alertController = UIAlertController(title: "Hey there", message: "Do you want to do it?", preferredStyle: .Alert)
let btnAction1 = UIAlertAction(title: "Yes", style: .Default) { (action : UIAlertAction) -> Void in
self.yes()
}
let btnAction2 = UIAlertAction(title: "No", style: .Default) { (action : UIAlertAction) -> Void in
self.no()
}
alertController.addAction(btnAction1)
alertController.addAction(btnAction2)
presentViewController(alertController, animated: true, completion: nil)
}
func yes() -> Int
{
print("Yes")
return 1
}
func no() -> Int
{
print("No")
return 0
}
}
Its working fine here, i hope it will work for u also.. :)
You made a mistake that closure won't execute until button clicked but function will return right now.You should deliver a closure to this function.It will look like:
class func showAlert(title: String, message: String, buttonTitle: String? = nil, buttonTitle2: String? = nil, sender: UIViewController,handler: ((Bool) -> Void)) -> Void
And handle it in alert action like this:
handler(true)