Fixing pushViewController & popViewController Animation Issues in iOS 14

Описание: Learn how to troubleshoot and fix animation issues with `pushViewController` and `popViewController` in iOS 14. Follow this guide for effective solutions!
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This video is based on the question https://stackoverflow.com/q/63994982/ asked by the user 'BITWISE' ( https://stackoverflow.com/u/13222632/ ) and on the answer https://stackoverflow.com/a/63998176/ provided by the user 'BITWISE' ( https://stackoverflow.com/u/13222632/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Animation Issues in iOS 14: pushViewController & popViewController

As developers, we often encounter unexpected behavior when updating to newer versions of iOS. A common issue faced by many is the animation discrepancies when using pushViewController and popViewController methods in iOS 14. If you've recently found that your navigation controller is no longer animating view transitions as it did in iOS 13, you're not alone. Let’s dive into the problem and its solution.

The Problem: Animation Failure

You might have implemented code like this:

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

However, despite using animated: true, the transition occurs without animation, behaving just like this:

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

Identifying the Core Issue

Upon investigation, you may have noticed that the animation properties in the lifecycle methods like viewWillAppear, viewDidDisappear, and viewDidAppear are false. You might try overriding these methods in your view controller, hoping to rectify the situation:

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

However, this doesn't yield the desired effect.

The Cause: Improper Function Override

The root cause of the problem lies in how lifecycle functions are overridden. In your UITabBarController, you might have mistakenly included this line in your viewDidAppear function:

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

Using viewWillAppear instead of the intended viewDidAppear can lead to unintended behavior within nested view controllers, such as your UINavigationController.

The Solution: Correctly Override Lifecycle Methods

To fix the issue, ensure that you correctly override the lifecycle methods. Here's how you should structure your code:

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

Key Takeaways

Always double-check which lifecycle methods you override: This ensures that your animations function as intended.

Test on different iOS versions: What works on one version might not work on another, so always verify your implementation.

Utilize cleanup comments: Keeping notes in your code can help other developers (or future you) understand your design decisions.

With this fix, your pushViewController and popViewController should work correctly, animating transitions properly.

Conclusion

Your experience with navigation controller animations in iOS 14 has provided valuable insight into the importance of proper method overrides in Swift. If you've dealt with this issue, feel free to share your solutions or ask questions. As the iOS development landscape continues to evolve, sharing knowledge is key to mastering the platform!

Keep your code clean, well-documented, and always keep an eye on those lifecycle methods to ensure smooth transitions in your app experience!