I wonder if its possible to show error messages in a UIAlertController.
My server sends error messages back as JSON.
I can get each error message using:
if let errorVal = errorVal {
if let items = errorVal["errors"].array {
for item in items {
print(item)
}
}
}
Now I wonder how I can show the errors in a AlertController.
The AlertController's message parameter expect a string but my errors come as JSON then cast to .array
let alertController = UIAlertController(title: "Hey! :)", message: "My Errors", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
Well, you could build up a string with description of each error ( or just message ) and show that ( may be too much to show ). It would go like this:
var errorMessages = ""
if let errorVal = errorVal {
if let items = errorVal["errors"].array {
for item in items {
print(item)
errorMessages = errorMessages + item + "\n" // if this is NSError you can use description, message or code
}
}
}
and later on you can do something like:
let alertController = UIAlertController(title: "Hey! :)", message: errorMessages , preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
Related
I have a problem trying to put an alert message after completing the action. The application crashes.
#IBAction func deleteAccountAction(_ sender: Any) {
let userID = prefs.value(forKey: "userId") as! String
print("user id: \(userID)")
let alert = UIAlertController(title: "Delete account", message: "Are you sure you want to delete your account?, This action cannot be reversed.", preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
// ...
}
let okayAction = UIAlertAction(title: "OK", style: .default) { (action) in
RestAPIManager.sharedInstance.deleteAccount(userID: userID){
(json, error) in
if(json != JSON.null){
print(json)
if(json["success"] == true){
//here i want succes alert
}else{
self.errorAlert()
}
}else{
}
}
}
alert.addAction(okayAction)
alert.addAction(cancelAction)
self.present(alert, animated: true)
}
func errorAlert(){
var dialogMessage = UIAlertController(title: "Error", message: "Error", preferredStyle: .alert)
self.present(dialogMessage, animated: true, completion: nil)
}
I tried to put an alert message after the action but I can't.
is solved needs to be async.
DispatchQueue.main.async {
self.errorAlert()
}
This question already has answers here:
how to create an alert in a swift file model that works for various view controller
(2 answers)
Closed 4 years ago.
I am trying to create a alert box inside the swift file other than the UIViewController file. but I could not create it.
extension NetworkManager {
func showAlert(message: String,from:UIViewController, title: String = "") {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
from.present(alertController, animated: true, completion: nil)
}
}
the above code is for implementing alertcontroller but I don't know how to pass the view controller I need to present so need assistance.
extension UIViewController {
func showAlert(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)
}
}
and use like this
from.showAlert(message:"Your message", title: "Title")
Add a Utilities class in your project.
class Utilities {
static func showSimpleAlert(OnViewController vc: UIViewController, Message message: String) {
//Create alertController object with specific message
let alertController = UIAlertController(title: "App Name", message: message, preferredStyle: .alert)
//Add OK button to alert and dismiss it on action
let alertAction = UIAlertAction(title: "OK", style: .default) { (action) in
alertController.dismiss(animated: true, completion: nil)
}
alertController.addAction(alertAction)
//Show alert to user
vc.present(alertController, animated: true, completion: nil)
}
}
Usage:
Utilities.showSimpleAlert(OnViewController: self, Message: "Some message")
Here is the extension I made. It allows to show either Alert or Action sheet and allows multiple actions "from the box"
extension UIViewController {
func presentAlert(title: String?, message: String, actions: UIAlertAction..., animated: Bool = true) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
actions.forEach { alert.addAction($0) }
self.present(alert, animated: animated, completion: nil)
}
func presentActionSheet(title: String?, message: String, actions: UIAlertAction..., animated: Bool = true) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .actionSheet)
actions.forEach { alert.addAction($0) }
self.present(alert, animated: animated, completion: nil)
}
}
Usage
let delete = UIAlertAction(title: "Delete", style: .destructive, handler: { _ in /* Your code here */})
let cancel = UIAlertAction(title: "Cancel", style: .default, handler: nil)
presentAlert(title: .albumPreferencesDeleteAlertTitle, message: "Very important message", actions: delete, cancel)
This is the more generalise method to show alert on view controller
func showAlert(msg: String, inViewController vc: UIViewController, actions: [UIAlertAction]? = nil, type: UIAlertControllerStyle = .alert, title: String = kAppName) {
let alertType: UIAlertControllerStyle = .alert
let alertTitle = kAppName
let alertVC = UIAlertController(title: alertTitle, message: msg, preferredStyle: alertType)
if let actions = actions {
for action in actions {
alertVC.addAction(action)
}
} else {
let actionCancel = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alertVC.addAction(actionCancel)
}
vc.present(alertVC, animated: true, completion: nil)
}
Usage
AppUtilities.showAlert(msg: "Test msg", inViewController: self) //for alert
AppUtilities.showAlert(msg: "Test msg", inViewController: self, actions: [okAction, cancelAction]) //for alert
AppUtilities.showAlert(msg: "Test Msg", inViewController: self, type: .actionSheet) //shows action sheet
You can add this function in extension or create a separate utility class as you want.
My app crashes and quit when user try to register a new account but that occurs on any device except devices deployed the app with Xcode.
All the devices are registered in the developer account and running iOS 11.4.1
Here is the register button function:
#IBAction func regButton(_ sender: Any) {
usernameText = usernameTextField.text
mobileText = mobileTextField.text
emailText = emailTextField.text
passwordText = passwordTextField.text
fieldText = categoryTextField.text
print(usernameText ?? "damn")
print(mobileText ?? "damn")
print(emailText ?? "damn")
print(passwordText ?? "damn")
print(fieldText ?? "damn")
if(type=="Seeker")
{
let url1 = "http://app.alosboiya.com.sa/hourjob.asmx/insert_jobseeker?name="+usernameText!+"&phone="+mobileText!
let url2 = "&email="+emailText!+"&password="+passwordText!+"&workex="+"companyDescText!"
let url3 = "&category="+fieldText!+"&image="+"downloadURLGlobal!"
let url4 = "&unpaidhour="+"string"+"&hourpaidlast30="+"string"+"&totalhourworked="+"string"+"&balance="+"string"+"&username="+usernameText!
stringURL = url1 + url2 + url3 + url4
}else
{
let url1 = "http://app.alosboiya.com.sa/hourjob.asmx/insert_company?name="+usernameText!+"&field="+fieldText!
let url2 = "&phone="+mobileText!+"&email="+emailText!+"&password="+passwordText!+"&workex="+"companyDescText!"+"&crcopy="+"downloadURLGlobal!"+"&logo="+"string"+"&username="+usernameText!
stringURL = url1 + url2
}
if Reachability.isConnectedToNetwork()
{
if(checkbox.on==true)
{
let url = URL(string: stringURL!)
Alamofire.request(url!).responseString {
(response) in
let result = response.result.value
do {
if(result=="True")
{
let alert = UIAlertController(title: "Registration Successfully", message: "Registration Done Successfully Congratulations",
preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style:
UIAlertActionStyle.default, handler: self.doSomething))
self.present(alert, animated: true, completion: nil)
}else
{
let alert = UIAlertController(title: "Registration Failed", message: "Registration Failed Please Try Again", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { (action) in
alert.dismiss(animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}
}
}else
{
let alert = UIAlertController(title: "License Agreement", message: "Check to Agree Licence Agreement", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { (action) in
alert.dismiss(animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}else
{
let alert = UIAlertController(title: "No Network Connection", message: "Connection Error Please Try Again", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { (action) in
alert.dismiss(animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}
If a user will tap the button but one or both text fields are empty then your app will crash due to forced unwraping (! mark) which you use in your code.
Example: if mobileText field will be empty then the your app will crash:
let url1 = "http://app.alosboiya.com.sa/hourjob.asmx/insert_jobseeker?name="+usernameText!+"&phone="+mobileText!
the solution is to use guard statement
guard let usernameText = usernameTextField.text,
mobileText = mobileTextField.text,
emailText = emailTextField.text,
passwordText = passwordTextField.text,
fieldText = categoryTextField.text else {
return
}
I have some code in my project:
#IBAction func createAccountAction(sender: AnyObject) {
if self.emailField.text == "" || self.passwordField.text == ""
{
let alertController = UIAlertController(title: "Oops!", message: "Please enter an email and password.", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
else
{
FIRAuth.auth()?.createUserWithEmail(self.emailField.text!, password: self.passwordField.text!) { (user, error) in
if error == nil
{
let alertController = UIAlertController(title: "Done", message: "Account created!", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.emailField.text = ""
self.passwordField.text = ""
}
else
{
let alertController = UIAlertController(title: "Oops!", message: error?.localizedDescription, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
As you can see in the last else statement I have a alertController with the message Oops that will show when clicking the createAccountAction button.
But that happens when the user presses the button and has not filled in anything in the textfields.
Now what I want is that when a user succesfully fills in the textfields, that a same popup should appear along with other text that I specified.
When I run the code it does the part
self.emailField.text = ""
self.passwordField.text = ""
but does not present the AlertController.
How can I achieve what I want?
You're missing the line:
self.presentViewController(alertController, animated: true, completion: nil)
which should be after:
self.emailField.text = ""
self.passwordField.text = ""
So you aren't presenting the alert.
Also. You can change that entire function to this much simpler one:
#IBAction func createAccountAction(sender: AnyObject) {
if self.emailField.text == "" || self.passwordField.text == "" {
let title = "Oops"
let message = "Please enter an email and password."
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
} else {
FIRAuth.auth()?.createUserWithEmail(self.emailField.text!, password: self.passwordField.text!) { (user, error) in
var title : String
var message : String
if error == nil {
title = "Done"
message = "Account created!"
self.emailField.text = ""
self.passwordField.text = ""
} else {
title = "Oops!"
message = "error?.localizedDescription"
}
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
}
}
You are only presenting the alert controller in the 'else' part of your 'if else' statement.
Additionally refactored example to ensure bugs like that don't happen:
var title: String!
var message: String!
if let error = error {
title = "Oops!"
message = error.localizedDescription
} else {
title = "Done"
message = "Account created!"
self.emailField.text = ""
self.passwordField.text = ""
}
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
I have no idea how to change screens programatically. I have an alert view and I want to be able to change screen when the user presses the "Ok" button. How do I do this?
Here is my new code:
func showAlertController(){
let tilte = "My Medication"
let message = NSLocalizedString("Go through Medication guide?", comment: "")
let cancelButtonTitle = NSLocalizedString("Dismiss", comment: "")
let otherButtonTitle = NSLocalizedString("Ok", comment: "")
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
let cancelAction = UIAlertAction(title: cancelButtonTitle, style: .Cancel){ action in
NSLog("User said no")}
let otherAction = UIAlertAction(title: otherButtonTitle, style: .Default){action in
// I know I need to put something in here.
let appointment = Appointment()
self.presentViewController(appointment, animated:true, completion:nil)
}
alertController.addAction(cancelAction)
alertController.addAction(otherAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
However now I get a bug saying:
Thread 1: EXC_BAD_INSTRUCTION(code=EXC_l1386_INVOP,subcode=0x0)
Add presentViewController inside UIAlertAction closure for "Ok" button, it means that the button is pressed and so you do your stuffs for the button being pressed inside the block.
class MainViewController: UIViewController {
...
...
func showAlertController(){
let tilte = "My Medication"
let message = NSLocalizedString("Go through Medication guide?", comment: "")
let cancelButtonTitle = NSLocalizedString("Dismiss", comment: "")
let otherButtonTitle = NSLocalizedString("Ok", comment: "")
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
let cancelAction = UIAlertAction(title: cancelButtonTitle, style: .Cancel){ action in
NSLog("User said no")}
let otherAction = UIAlertAction(title: otherButtonTitle, style: .Default){action in
// I know I need to put something in here.
let appointmentViewController = AppointmentViewController()
self.presentViewController(appointmentViewController, animated:true, completion:nil)
}
alertController.addAction(cancelAction)
alertController.addAction(otherAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
...
...
}
class AppointmentViewController: UIViewController {
}