CODEWITHSUNDEEP
iosswiftmemory-managementuialertcontroller
Lawrence413
Lawrence413

Reputation: 2016

UIAlertController Gets Deallocated Before Presenting It

I want to make a "rate app" alert, but for some reason it gets deallocated before showing it.

Here's the code:

func showAlert() {
    if #available(iOS 8.0, *)
    {
        let alertController = UIAlertController(title: "Rate App", message: "Rate this app now", preferredStyle: .Alert)
        let neverAction = UIAlertAction(title: "Never Show This Again", style: .Destructive, handler: { (action: UIAlertAction) in
            self.userDefaults.setBool(true, forKey: "rateAlertRejected")
        })
        let rateAction = UIAlertAction(title: "Rate Now", style: .Default, handler: { (action: UIAlertAction) in
            // Rate App
        })
        let remindAction = UIAlertAction(title: "Remind Me Later", style: .Cancel, handler: nil)

        alertController.addAction(rateAction)
        alertController.addAction(neverAction)
        alertController.addAction(remindAction)

        presentViewController(alertController, animated: true, completion: nil)
    }
    else
    {
        // Identical code (using UIAlertView) for iOS 7 which works perfectly
    }
}

The method executes (in certain conditions, but for testing purposes it does it every time) after a custom unwind segue.

Why do I have this problem? I used UIAlertController before but I had no issues.

Upvotes: 0

Views: 179

Answers (1)

Shubhank
Shubhank

Reputation: 21805

According to your comment you show showAlert in a method that executes after a custom unwind segue.

unwind segue dismisses the view heriarchy and therefore your alert does not get reference to a view controller to show from.

To solve this, show your alert in the View controller you unwind to or wait for the alert controller action to be completed before unwinding.

Upvotes: 1

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