可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
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 are related.
showCameraAction gets called when a button is pressed. I've removed all of the content from the delegate method and still get the leak in the case shown below. Am I using UIActionSheet in some way that I shouldn't? I would appreciate any help in resolving this issue. The same code has no leaks with IOS 7 (in the simulator).
-(IBAction)showCameraAction:(id)sender { UIActionSheet* actionSheet = [[UIActionSheet alloc] initWithTitle:@"Photo From:" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Phone", @"Flickr", nil]; [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]]; //also tried just showInView: self.view }
//empty
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { }
Also tried with UIAlertController, with the same result:
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Photo From:" message:@"" preferredStyle:UIAlertControllerStyleActionSheet]; UIAlertAction *phoneAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"Phone", @"Phone action") style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) { NSLog(@"Phone action"); }]; UIAlertAction *flickrAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"Flickr", @"Flickr action") style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { NSLog(@"Flickr action"); }]; [alertController addAction:phoneAction]; [alertController addAction:flickrAction]; [self presentViewController:alertController animated:YES completion:nil];
Screenshot with trace: https://www.dropbox.com/l/FmnTCd0PvVhuu16BVHZo7p
回答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];
回答2:
This is an iOS bug.
See Apple Bug Reporter issue 21005708, Memory leak in UIAlertController under ARC.
回答3:
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
回答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
