iOS 8 Only Memory Leak with UIAlertController or UIActionSheet

Question

I\'m seeing a memory leak in iOS 8 in simulator when I do the following with UIActionSheet or UIAlertController. UIActionSheet uses UIAlertController in IOS 8 so the issues

Answer 1

I would suggest to use "UIAlertController" in iOS8. And dismiss the alertController object from the presented controller, while firing any event by "UIAlertAction" block.

UIAlertController  *alertController = [UIAlertController alertControllerWithTitle:@"title"
message:@"message"
preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction  *alertAction = [UIAlertAction actionWithTitle:@"actionTitle"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
//Do ur stuff
[alertController dismissViewControllerAnimated:YES
                                    completion:NULL];
}];
[alertController addAction:alertAction];
[self presentViewController:alertController
                       animated:YES
                     completion:NULL];

Answer 2

This is no answer, but more evidence for the leak, that exceeds a comment. May it help to find a solution or workaround. The leak seems to be device specific on iPad 3/Retina!

I have made some tests myself by overriding retain and release of the view-controller to show the leak in iOS 8.x

See also: https://devforums.apple.com/message/1099577#1099577

• LEAKY Devices: iPad 3 (A1416), iPad Air Simulator
• GOOD Devices: iPhone 6 iOS 8.1.3, iPhone 4s with iOS 8.1.2

AGC is the view-controller. The correct retain count should be 2.

iPad Retina Simulator iOS 8.1 AND real iPad LEAK // second run ... this time with LEAK by selecting an option 12:56:50.929 SimplySolitaire[27643:473670] >>> WILL actionSheet showInView: retain = 2 12:56:50.930 SimplySolitaire[27643:473670] AGC retain == 3 12:56:50.950 SimplySolitaire[27643:473670] AGC retain == 4 12:56:50.951 SimplySolitaire[27643:473670] AGC retain == 5 12:56:50.951 SimplySolitaire[27643:473670] AGC retain == 6 12:56:50.951 SimplySolitaire[27643:473670] <<< DID actionSheet showInView: retain = 6 12:56:50.998 SimplySolitaire[27643:473670] AGC release = 5 12:56:51.042 SimplySolitaire[27643:473670] AGC release = 4 12:56:51.042 SimplySolitaire[27643:473670] AGC release = 3 // USER dismisses the action sheet with tapping a button (delegate is nil) 12:56:53.257 SimplySolitaire[27643:473670] AGC retain == 4 12:56:53.257 SimplySolitaire[27643:473670] AGC retain == 5 12:56:53.258 SimplySolitaire[27643:473670] AGC retain == 6 12:56:53.258 SimplySolitaire[27643:473670] AGC retain == 7 12:56:53.258 SimplySolitaire[27643:473670] AGC release = 6 12:56:53.259 SimplySolitaire[27643:473670] AGC release = 5 12:56:53.612 SimplySolitaire[27643:473670] AGC release = 4 12:56:53.612 SimplySolitaire[27643:473670] AGC release = 3 // <<<<<<<<<< LEAK should be 2 // the last release is missing, but only iOS system code has executed.

iPad Retina Simulator iOS 8.1 AND real iPad, dismiss without LEAK 12:54:54.757 SimplySolitaire[27643:473670] >>> WILL actionSheet showInView: retain = 2 12:54:54.758 SimplySolitaire[27643:473670] AGC retain == 3 12:54:54.798 SimplySolitaire[27643:473670] AGC retain == 4 12:54:54.798 SimplySolitaire[27643:473670] AGC retain == 5 12:54:54.798 SimplySolitaire[27643:473670] AGC retain == 6 12:54:54.798 SimplySolitaire[27643:473670] <<< DID actionSheet showInView: retain = 6 12:54:54.845 SimplySolitaire[27643:473670] AGC release = 5 12:54:54.891 SimplySolitaire[27643:473670] AGC release = 4 12:54:54.891 SimplySolitaire[27643:473670] AGC release = 3 // NOW ... dismiss the action sheet without selection (delegate is nil) 12:55:05.643 SimplySolitaire[27643:473670] AGC retain == 4 12:55:05.644 SimplySolitaire[27643:473670] AGC retain == 5 12:55:05.644 SimplySolitaire[27643:473670] AGC retain == 6 12:55:05.644 SimplySolitaire[27643:473670] AGC retain == 7 12:55:05.645 SimplySolitaire[27643:473670] AGC release = 6 12:55:05.645 SimplySolitaire[27643:473670] AGC release = 5 12:55:05.996 SimplySolitaire[27643:473670] AGC release = 4 12:55:05.997 SimplySolitaire[27643:473670] AGC release = 3 12:55:05.997 SimplySolitaire[27643:473670] AGC release = 2 // this is a correct retain of 2

Answer 3

This is an iOS bug.

See Apple Bug Reporter issue 21005708, Memory leak in UIAlertController under ARC.

Answer 4

I would suggest switching to UIAlertController. UIActionSheet is deprecated in iOS 8, so you might try giving it a shot and see if there's still the leak