I have a UIAlertController in which the options are populated from an array and are presented to the user. The user then selects an option from the alert. After this, I have a separate alert that provides the user with a confirmation message that has an okay button.
myAlert.addAction(UIAlertAction.init(title: item, style: .Default, handler: {
(UIAlertAction) in
self.chosenBusiness.append(businessNameData[item]!)
}))
self.presentViewController(myAlert, animated: true, completion: nil)
The code above gathers the data from the array and pushes it into actions in myAlert. The code above is inside of a for loop.
After this I use a function to retrieve the topmost view controller, and then push the next alert.
let top = topMostController()
let alertController = UIAlertController(title: "Location pinned", message: "You've successfully pinned this location, good work!", preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {
(result : UIAlertAction) -> Void in
print("OK")
}
alertController.addAction(okAction)
self.presentViewController(myAlert, animated: true, completion: nil)
top.presentViewController(alertController, animated: true, completion: {
_ in
})
The error I receive is:
Attempting to load the view of a view controller while it is
deallocating and is not allowed and may result in undefined behavior.
UIAlertController: 0x1535b1cd0.
Can someone help me with this?
I think this is what you are looking for. The second must be called with the dismissal action of the first. Also, anytime you work with UI, It is safer to use dispatch_async(dispatch_get_main_queue()) {
\\code }
than not if you are not positive you are currently on the main queue.
let firstAlertController = UIAlertController(title: "First", message: "This is the first message.", preferredStyle: UIAlertControllerStyle.Alert)
let secondAlertController = UIAlertController(title: "Second", message: "This is the second message.", preferredStyle: UIAlertControllerStyle.Alert)
let secondDismissAction = UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default, completion: nil)
secondAlertController.addAction(secondDismissAction)
let firstDismissAction = UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default) {
UIAlertAction in
dispatch_async(dispatch_get_main_queue()) {
self.presentViewController(secondAlertController, animated: true, handler: nil)
}
}
firstAlertController.addAction(firstDismissAction)
self.presentViewController(firstAlertController, animated: true, completion: nil)
Related
My view is being dismissed through the previous button on the navigation bar. I think the correct term for that is that the view is being popped off the view stack. Now before actually dismissing the view I want to display a UIAlert asking the user to setup his/her address.
I've tried this but the UIAlert is not being show:
override func viewWillDisappear(animated: Bool) {
if let currentUser = ApiManager.sharedInstance.currentUser {
if !currentUser.hasAddress {
let alert = UIAlertController(title: "Missing address", message: "We see you're stilling missing an address, would you like set it now?", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "yes".localized, style: .Default, handler: { (alertAction) in
let newViewController = LocationViewController()
newViewController.delegate = self
self.navigationController?.pushViewController(newViewController, animated: true)
}))
alert.addAction(UIAlertAction(title: "no".localized, style: .Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
}
}
In my console the following gets printed:
2016-10-28 16:58:47.380 gaifong[17096:14515422] Warning: Attempt to present <UIAlertController: 0x7fd7037e4cb0> on <gaifong.ProfileViewController: 0x7fd7048cc000> whose view is not in the window hierarchy!
You should add leftBarButtonItem on navigationItem and make an action to leftBarButtonItem where you can handle this.
in viewDidLoad
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(self.goBack))
// Then handle the button selection
func goBack() {
if let currentUser = ApiManager.sharedInstance.currentUser {
if !currentUser.hasAddress {
let alert = UIAlertController(title: "Missing address", message: "We see you're stilling missing an address, would you like set it now?", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "yes".localized, style: .Default, handler: { (alertAction) in
// here you can pop to main controller
self.navigationController?.popViewControllerAnimated(true)
}))
alert.addAction(UIAlertAction(title: "no".localized, style: .Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
}
}
I'm quite new to Swift (and coding in general) and to this website.
I'm having a little bit of an issue now. In my app, I have an alert when a timer reaches 0. In that alert, there are 2 buttons. One says "Share" and the other says "Continue". I want to make it such that when a user taps "Continue", the next Storyboard will be shown to them. As of now, whatever button I press will dismiss the alert, but stay on the same Storyboard. (It also prints to the console which button I pressed, but of course that's just for me to see).
How do I go about doing this? Here is my code, in case anyone wants to know.
let alert = UIAlertController(title: "Time's Up!", message: "What would you like to do now?", preferredStyle: .Alert)
let firstAction = UIAlertAction(title: "Continue", style: .Default) { (alert: UIAlertAction!) -> Void in
NSLog("You pressed button one")
}
let secondAction = UIAlertAction(title: "Share", style: .Default) { (alert: UIAlertAction!) -> Void in
NSLog("You pressed button two")
}
alert.addAction(firstAction)
alert.addAction(secondAction)
presentViewController(alert, animated: true, completion:nil)
Try with this:
// Create the alert controller
var alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
// Create the actions
var okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {
UIAlertAction in
NSLog("OK Pressed")
let storyboard = UIStoryboard(name: "MyStoryboardName", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("someViewController") as UIViewController
self.presentViewController(vc, animated: true, completion: nil)
}
var cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) {
UIAlertAction in
NSLog("Cancel Pressed")
//do whatever you want here
}
// Add the actions
alertController.addAction(okAction)
alertController.addAction(cancelAction)
// Present the controller
self.presentViewController(alertController, animated: true, completion: nil)
If you haven't already set your ViewControllerIdentifier:
You need to set the Identifier value that you can find on the right column
Here is the code that might help you. When you create a AlertController with actions, you can provide the actions and style of the button when you define them. In code below action is in the closure (Block) and style is defined as .Default or .Cancel
let alert = UIAlertController(title: "Time's Up!", message: "What would you like to do now?", preferredStyle: .Alert)
let firstAction = UIAlertAction(title: "Continue", style: .Default) { (alert: UIAlertAction!) -> Void in
// Action when you press button goes here
print("Here you show next storyboard item.")
// Code to push new ViewController. For example :
self.navigationController?.pushViewController(newVCInstance, animated: true)
}
let secondAction = UIAlertAction(title: "Share", style: .Default) { (alert: UIAlertAction!) -> Void in
print("Here you share things.")
// Code to share things.
}
let thirdAction = UIAlertAction(title: "Cancel", style: . Cancel) { (alert: UIAlertAction!) -> Void in
print("Just dismissing the Alert Controller.")
}
alert.addAction(firstAction)
alert.addAction(secondAction)
alert.addAction(thirdAction)
presentViewController(alert, animated: true, completion:nil)
This question already has answers here:
How to show UIAlertController from Appdelegate
(6 answers)
Closed 4 years ago.
I try the next code snippet:
var alert = UIAlertController(title: "Alert", message: "Cannot connect to : \(error!.localizedDescription)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
in my AppDelegate, but it prints me the next error in console:
Warning: Attempt to present <UIAlertController: 0x7ff6cd827a30> on <Messenger.WelcomeController: 0x7ff6cb51c940> whose view is not in the window hierarchy!
How can I fix this error?
This is what i'm using now to do that.
var alertController = UIAlertController(title: "Title", message: "Any message", preferredStyle: .ActionSheet)
var okAction = UIAlertAction(title: "Yes", style: UIAlertActionStyle.Default) {
UIAlertAction in
NSLog("OK Pressed")
}
var cancelAction = UIAlertAction(title: "No", style: UIAlertActionStyle.Cancel) {
UIAlertAction in
NSLog("Cancel Pressed")
}
alertController.addAction(okAction)
alertController.addAction(cancelAction)
self.window?.rootViewController?.presentViewController(alertController, animated: true, completion: nil)
Swift 5:
let alert = UIAlertController(title: "Test", message:"Message", preferredStyle: UIAlertController.Style.alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
// show the alert
self.window?.rootViewController?.present(alert, animated: true, completion: nil)
As per Jorge's answer, updated for Swift 4
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .actionSheet)
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
UIAlertAction in
NSLog("OK Pressed")
}
let cancelAction = UIAlertAction(title: "CANCEL", style: UIAlertActionStyle.cancel) {
UIAlertAction in
NSLog("Cancel Pressed")
}
alertController.addAction(okAction)
alertController.addAction(cancelAction)
self.window?.rootViewController?.present(alertController, animated: true, completion: nil)
Swift 3.0 or above, Working in all condition , like in case of tab bar, in case of presented view etc ..
let alert = UIAlertController(title: "Test", message:"Message", preferredStyle: UIAlertControllerStyle.alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
// show alert
let alertWindow = UIWindow(frame: UIScreen.main.bounds)
alertWindow.rootViewController = UIViewController()
alertWindow.windowLevel = UIWindowLevelAlert + 1;
alertWindow.makeKeyAndVisible()
alertWindow.rootViewController?.present(alertController, animated: true, completion: nil)
I had the similar problem.
I have fixed it by presenting UIAlertController in Main Queue.
Code Looks like following.
let alert = UIAlertController(title: "My Title", message: "My Message", preferredStyle: .alert)
let actionYes = UIAlertAction(title: "Yes", style: .default, handler: { action in
print("action yes handler")
})
let actionCancel = UIAlertAction(title: "Cancel", style: .destructive, handler: { action in
print("action cancel handler")
})
alert.addAction(actionYes)
alert.addAction(actionCancel)
DispatchQueue.main.async {
self.window?.rootViewController?.present(alert, animated: true, completion: nil)
}
Have you tried using UIApplication.shared.keyWindow?.rootViewController?.present(...) ?
I suppose you are calling that code snippet from the applicationDidFinishLunchingWithOptions.
I tried it as a matter of fact because I had to. The thing is: what you are trying to do is correct but the ViewController that the AppDelegate makes and presents is about to be put on screen and before that, the code snippet tries to create an alertView and put in on top of non existent View of the RootViewController.
What I would do is move it to another delegate call which is guaranteed to be called after the RootViewController is presented.
func applicationDidBecomeActive(application: UIApplication) {
//This method is called when the rootViewController is set and the view.
// And the View controller is ready to get touches or events.
var alert = UIAlertController(title: "Alert", message: "Cannot connect to :", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
}
But as always know the responsibility of the AppDelegate. It is to handle the application lifecycle and application wide delegate calls and events. If putting code here makes sense, then do it. But if you will be better off putting the code on the rootViewController or other parts then think about it too.
Anyway, hope it helps. Cheers!
I would suggest NOT doing this in the AppDelegate. The App Delegate it intended to handle Delegate functions from the OS rather than implementing things like alert views.
If you are wanting to present an alert view here to be shown at the start of the app I would do this by implementing it in your first view controller.
I am trying to popViewController to the previous View Controller in the navigation stack after an alertView. As of now, my program will not run the popViewController method, since the alertView is in the way, and brings up the error:
UINavigationController 0x17670900 while an existing transition or presentation is occurring; the navigation stack will not be updated.
How do I go about running the popViewController method after the user clicks OK from the alertView? Do I have to set a delegate which detects when the used clicks OK?
Here is my code:
//alertView after Picture saved
let alertView = UIAlertController(title: "Success!", message: "Record Saved to Database", preferredStyle: .Alert)
alertView.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))
self.presentViewController(alertView, animated: true, completion: nil)
//go to previous controller using popViewController, doesnt work, brings up error message
if let navController = self.navigationController {
navController.popViewControllerAnimated(true)
}
You need to pop the view controller when user presses the Ok button from AlertView.
let alertView = UIAlertController(title: "Success!", message: "Record Saved to Database", preferredStyle: .Alert)
let OKAction = UIAlertAction(title: "Ok", style: .Default) { (action) in
// pop here
if let navController = self.navigationController {
navController.popViewControllerAnimated(true)
}
}
alertView.addAction(OKAction)
self.present(alertView, animated: true, completion: nil)
You can put the "popViewControllerAction" inside an alert action like this.
func alertMethod() {
var okAlertController = UIAlertController(title: NSLocalizedString("Your title", comment: ""), message: "Your message", preferredStyle:
UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(title: NSLocalizedString("Ok", comment: ""), style: UIAlertActionStyle.Default) { (UIAlertAction) -> Void in
// your action - navController.popViewControllerAnimated(true)
}
let cancelAction = UIAlertAction(title: NSLocalizedString("Cancel", comment: ""), style: UIAlertActionStyle.Default) { (UIAlertAction) -> Void in
// your action
}
}
saveAlertController.addAction(okAction)
saveAlertController.addAction(cancelAction)
self.presentViewController(okAlertController, animated: true, completion: nil)
}
That should work, in that case the method gets called after the user presses a button...
I have a view controller which contains a sub-view. And inside the sub-view class, I may need to pop out an alert when some condition is satisfied.
class GameViewController: UIViewController {
#IBOutlet var gameBoardUIView: GameBoardUIView
...
}
class GameBoardUIView: UIView {
...
func move() {
if !gameBoard.checkNextMoveExist() {
var alert = UIAlertController(title: "Game Over", message: nil, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Take Me Back", style: UIAlertActionStyle.Cancel, handler: {(action: UIAlertAction!) in
println("Taking user back to the game without restarting")
}))
alert.addAction(UIAlertAction(title: "New Game", style: UIAlertActionStyle.Destructive, handler: {(action: UIAlertAction!) in
println("Starting a new game")
self.restartGame()
}))
// This is where the question is
// self.presentViewController(alert, animated: true, completion: nil)
}
}
}
As you can see from the code, I cannot call presentViewController function to show the alert because my sub view is not a controller class. Should I somehow create a week reference to the parent controller inside the sub-view? What would be the best practice to implement such reference?
Swift 4
Just present the alert in UIApplication windows in root view controller:
let title = "Some title"
let message = "body message"
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
let action = UIAlertAction(title: "Aceptar", style: .cancel, handler: nil)
alert.addAction(action)
UIApplication.shared.keyWindow?.rootViewController?.present(alert, animated: true, completion: nil)
there are couple of ways how you can catch a UIViewController in your UIView.
you can make any of your view controllers as a delegate to show an alert;
you can pass a view controller's reference to your view; and
in general you can always grab the rootViewController anywhere in your code.
you need to call the dismissViewControllerAnimated(_: completion:) on the same view controller when you'd like to dismiss your alert later.
thus, I'd do such a quick solution for your case:
func move() {
if !gameBoard.checkNextMoveExist() {
let rootViewController: UIViewController = UIApplication.sharedApplication().windows[0].rootViewController
var alert = UIAlertController(title: "Game Over", message: nil, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Take Me Back", style: UIAlertActionStyle.Cancel, handler: {(action: UIAlertAction!) in
rootViewController.dismissViewControllerAnimated(true, completion: nil)
println("Taking user back to the game without restarting")
}))
alert.addAction(UIAlertAction(title: "New Game", style: UIAlertActionStyle.Destructive, handler: {(action: UIAlertAction!) in
rootViewController.dismissViewControllerAnimated(true, completion: nil)
println("Starting a new game")
self.restartGame()
}))
rootViewController.presentViewController(alert, animated: true, completion: nil)
}
}