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Problems with UIViewController Lifecycle Methods and Modal Presentation in Objective-C

๐Ÿ‘€ Views: 2 ๐Ÿ’ฌ Answers: 1 ๐Ÿ“… Created: 2025-06-05
uiviewcontroller modal ios Objective-C

I've been banging my head against this for hours. I'm building a feature where I'm working with a strange scenario with modal presentations in my Objective-C app that relies on `UIViewController`. When I present a modal view controller, I expect the `viewWillAppear:` method of the presenting view controller to be called, but it isn't in some cases. I am using Xcode 14.1 and targeting iOS 16.0. Hereโ€™s the relevant code snippet for presenting the view controller: ```objective-c - (void)presentModalView { UIViewController *modalVC = [[ModalViewController alloc] init]; modalVC.modalPresentationStyle = UIModalPresentationFullScreen; [self presentViewController:modalVC animated:YES completion:nil]; } ``` In my `viewWillAppear:` method, I'm logging a message to see if it gets called: ```objective-c - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; NSLog(@"Presenting view will appear"); } ``` However, when I dismiss the modal view using `dismissViewControllerAnimated:completion:`, the log message doesn't appear consistently. Iโ€™ve checked that the modal view is indeed dismissed properly, and I'm using the delegate pattern to notify the presenting view controller when the modal view is dismissed. Hereโ€™s how I dismiss it: ```objective-c - (void)dismissModal { [self dismissViewControllerAnimated:YES completion:nil]; } ``` I also tried calling `viewWillAppear:` manually after dismissing, but that feels wrong and doesn't seem to help. The scenario seems to occur only when I switch between different modal presentations, and I suspect it might be related to the lifecycle of the view controllers. Has anyone experienced similar behavior, or does anyone know what could cause `viewWillAppear:` to not be triggered in this scenario? Any guidance would be appreciated! Thanks in advance! I'm working with Objective-C in a Docker container on Ubuntu 22.04. How would you solve this? This is my first time working with Objective-C 3.11.