Скачать или смотреть How to Dismiss Presenting View Controller when "Ok" Action Tapped in UIAlertController

Learn how to handle dismissal of a presenting view controller after tapping "Ok" in a UIAlertController. We explain common pitfalls and provide solutions for smooth user experiences in iOS apps.
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This video is based on the question https://stackoverflow.com/q/62587109/ asked by the user 'Nilay Neeranjun' ( https://stackoverflow.com/u/13816362/ ) and on the answer https://stackoverflow.com/a/62587238/ provided by the user 'Rahul Umap' ( https://stackoverflow.com/u/3278326/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dismiss Presenting View Controller when "Ok" Action Tapped in UIAlertController

When developing iOS applications, managing view controllers is an essential part of creating a smooth user experience. One common use case is dismissing a view controller after a user confirms an action using UIAlertController. However, many developers encounter challenges when trying to dismiss the presenting view controller upon tapping "Ok" in an alert. This guide will guide you through this issue and provide a clear solution.

The Problem: Dismissal Not Occurring

In the scenario described, a developer aimed to dismiss a loading indicator and present a success alert. However, upon tapping "Ok," the view controller did not dismiss as expected. Everything seemed to work fine regarding printing the Ok selected message, but the view controller remained on screen.

Here’s a part of the developer's code that illustrates the issue:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Dismissing on the Main Thread

The main reason why the view controller did not dismiss properly could be due to threading issues. UIKit must be updated on the main thread. Here’s how to modify the code so that it works correctly:

Update Your Alert Action Handler

In the completion handler of your UIAlertAction, wrap the dismissal call inside a DispatchQueue.main.async block. This ensures that the dismissal is executed on the main thread, leading to the expected behavior.

Here’s the revised code:

[[See Video to Reveal this Text or Code Snippet]]

Additional Considerations

Check the Navigation Hierarchy: If your view controller is pushed onto a navigation stack, instead of dismissing it, use the pop method:

[[See Video to Reveal this Text or Code Snippet]]

View Controller State: Use the property self.isBeingPresented to determine if your view controller is presented modally. This can help debug cases when the dismissal call is not functioning as expected.

Conclusion

By ensuring that you dismiss your view controller on the main thread, along with paying attention to its state in the navigation hierarchy, you can effectively handle alert confirmations and improve your app's user experience. Always remember to test and verify that your alert actions trigger the expected outputs.

Implementing these changes will help you solve the dismissal issue effectively. Now, happy coding with UIKit!