UIAlert in Swift that automatically disappears?

Question

I have the following code:

    /// Creates Alerts on screen for user.
func notifyUser(title: String, message: String) -> Void
{
    let alert = UIAlertController(title: title,
        message: message,
        preferredStyle: UIAlertControllerStyle.Alert)

    let cancelAction = UIAlertAction(title: "OK",
        style: .Cancel, handler: nil)

    alert.addAction(cancelAction)
    UIApplication.sharedApplication().keyWindow?.rootViewController!.presentViewController(alert, animated: true,
        completion: nil)
}

Which shows the following Alert:

I would prefer the Alert to appear for maybe 1-2 seconds and auto dismiss without having to click ok or dismiss. Is this possible?

Changing the UX of how the UIAlert works is maybe not the best approach, consider a custom view? — will, Jan 31 '16 at 00:16

score 4 · Answer 1 · edited Jan 29 '16 at 22:58

Yes it's completely possible, I think the @Duncan C approach will work very well and it's self explanatory, so I going to explain you in code the @Duncan approach and another approach is using delays with the Grand Central Dispatch(GCD).

First Approach: Using the NSTimer class

// set the UIAlerController property
var alert: UIAlertController!

func notifyUser(title: String, message: String, timeToDissapear: Int) -> Void
{
    alert = UIAlertController(title: title,
        message: message,
        preferredStyle: UIAlertControllerStyle.Alert)

    let cancelAction = UIAlertAction(title: "OK",
        style: .Cancel, handler: nil)

    alert.addAction(cancelAction)
    UIApplication.sharedApplication().keyWindow?.rootViewController!.presentViewController(alert, animated: true,
        completion: nil)

    // setting the NSTimer to close the alert after timeToDissapear seconds.
    _ = NSTimer.scheduledTimerWithTimeInterval(Double(timeToDissapear), target: self, selector: Selector("dismissAlert"), userInfo: nil, repeats: false)
}

Second Approach: Using GCD

// set the UIAlerController property
var alert: UIAlertController! 

func notifyUser(title: String, message: String, timeToDissapear: Int) -> Void
{
    alert = UIAlertController(title: title,
        message: message,
        preferredStyle: UIAlertControllerStyle.Alert)

    let cancelAction = UIAlertAction(title: "OK",
        style: .Cancel, handler: nil)

    alert.addAction(cancelAction)
    UIApplication.sharedApplication().keyWindow?.rootViewController!.presentViewController(alert, animated: true,
        completion: nil)

    // Delay the dismissal by timeToDissapear seconds
    let delay = Double(timeToDissapear) * Double(NSEC_PER_SEC)
    let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
    dispatch_after(time, dispatch_get_main_queue()) { [weak self] in
        self!.alert.dismissViewControllerAnimated(true, completion: nil)
    }
}

And then you can call it in anywhere you want like in the following way :

self.notifyUser("Hello", message: "World", timeToDissapear: 3)

I hope this help you.

score 2 · Answer 2 · answered Sep 28 '18 at 08:27

Here Is the code for Swift 4 Please Refer...Thank you

  let alert = UIAlertController(title: "Success", message: "Record Updated Successfully", preferredStyle: UIAlertController.Style.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)
    DispatchQueue.main.asyncAfter(deadline: .now() + 2) {

        alert.dismiss(animated: true, completion: nil)
    }

Thank you Fansad. This is so simple. – Nov 02 '18 at 09:53 — , Nov 02 '18 at 09:53

score 1 · Answer 3 · answered Jan 29 '16 at 21:52

Sure. A UIAlertController is a special type of UIViewController. You're displaying it using presentViewController:animated:completion:. Just save a pointer to the UIAlertController into an instance variable, start a timer, and when the timer fires, call dismissViewControllerAnimated:completion:. You might want to get rid of the OK button action in that case, and if you leave the OK button you'll need to test and make sure your code works if you click OK before the timer fires.

Tom el Safadi · Answer 4 · 2016-01-29T22:42:25.927

0

Try this code:

var timer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: "dismissAlert", userInfo: nil, repeats: true)


func dismissAlert()
{
     // Dismiss the alert from here
     alert.dismissViewControllerAnimated(false, completion: nil)

}

I tried it and this worked fine. You can set the timer inside

scheduledTimerWithTimeInterval

where the current time is set to 5.0 seconds

edited Jan 29 '16 at 22:42

answered Jan 29 '16 at 22:22

Tom el Safadi

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score 0 · Answer 5 · answered Mar 16 '17 at 10:11

func alert2 (_ dictKey: String){
    if self.presentedViewController == nil {
        let alertController = UIAlertController(title: nil,     message: dictKey, preferredStyle: .alert )
        alertController.addAction(UIAlertAction(title: "START AGAIN", style: UIAlertActionStyle.default, handler: {(action:UIAlertAction!) in self.returnToStart()}))
        alertController.addAction(UIAlertAction(title: "REQUEST PIN", style: UIAlertActionStyle.default, handler:{(action:UIAlertAction!) in self.pinCreate()
        self.dismiss(animated: false, completion: nil)//This dismisses the alert
        }))
        self.present(alertController, animated: true,completion: nil)
    }

}

This proved to be a simple solution

score 0 · Answer 6 · answered Feb 20 '20 at 02:03

 func notifyUser(message: String) -> Void {
  let alert = UIAlertController(title: "", message: message, preferredStyle: UIAlertController.Style.alert)
  present(alert, animated: true, completion: nil)
  DispatchQueue.main.asyncAfter(deadline: .now() + 2) { [unowned self] in
   self.dismiss(animated: true)
  }
 }

To use:

  notifyUser(message: "Image Saved")

UIAlert in Swift that automatically disappears?

6 Answers6

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