Resolving UICollectionView Selection Issues in UINavigationItem Title View

Описание: Discover how to ensure `UICollectionView` is responsive to selection within `UINavigationItem` title view in your iOS app.
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This video is based on the question https://stackoverflow.com/q/64652434/ asked by the user 'nick' ( https://stackoverflow.com/u/14197140/ ) and on the answer https://stackoverflow.com/a/64653926/ provided by the user 'DonMag' ( https://stackoverflow.com/u/6257435/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving UICollectionView Selection Issues in UINavigationItem Title View

If you're an iOS developer, you might come across situations where your UICollectionView, embedded within the UINavigationItem's title view, behaves oddly. One common issue is that the collection view does not respond to selections when it's placed in the title view. This can be frustrating but luckily, it's often a fixable issue. Let's delve into why this happens and how you can solve it.

Understanding the Problem

When you embed a UICollectionView inside the title view of a UINavigationItem, it’s easy to assume that it will behave like any other UICollectionView. However, many developers report that their collection view cells remain unresponsive to touch events. The fundamental reason for this is usually related to the layout constraints and bounds of the view.

The Symptoms

Tap on collection view items does not trigger any action within the didSelectItemAt method.

Other UI elements in the navigation bar might be overlapping or interfering with touch events.

The Solution: Correcting Layout Constraints

To address the unresponsiveness of your collection view, we need to ensure that it properly fits within its parent view's bounds. The following steps outline how to modify your create() method to fix the layout constraints of your UICollectionView.

Step-by-Step Fix

Remove Old Layout Code: Get rid of the existing anchor method you were using to add the collection view, which may lead to overlaps or bounds issues.

Modify the create() Method: Below is the revised version of the method that applies correct constraints on the UICollectionView:

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

Why This Works

Adjusting Constraints: By explicitly defining your constraints to the title view’s boundaries, any interactions should properly register without interference.

Flexible Layout: By using NSLayoutConstraint, you make sure your collection view resizes correctly based on its parent view, maintaining both usability and aesthetics.

Conclusion

Incorporating UICollectionView into your UINavigationItem title view can be beneficial for your app’s user experience. However, addressing issues like unresponsive selections is crucial for ensuring smooth functionality. By applying correct layout constraints, as detailed above, you can enhance interaction with your collection view and improve overall app responsiveness.

Keep exploring, and happy coding! If you encounter any additional issues, don’t hesitate to share them.