Скачать или смотреть Fixing UISlider Animation Issue in Custom UITableViewCell on Swift 5.5

Learn how to enable and disable UISlider in a custom UITableViewCell without reloading the entire table view in Swift 5.5.
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This video is based on the question https://stackoverflow.com/q/70455422/ asked by the user 'cvld' ( https://stackoverflow.com/u/4722498/ ) and on the answer https://stackoverflow.com/a/70623827/ provided by the user 'cvld' ( https://stackoverflow.com/u/4722498/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting UISlider Animation Issues in UITableViewCell with Swift 5.5

When working with UITableViewCell in Swift 5.5, it’s not uncommon to encounter challenges, especially when integrating UI components like UISlider. One particular issue developers face is how to effectively enable and disable the UISlider when interacting with other UI elements such as buttons. In this guide, we'll explore this problem in detail and provide a clear, step-by-step solution.

The Problem: UISlider Not Updating

Imagine you've built a custom UITableViewCell using a XIB file. Within it, you’ve placed a UISlider that you want to be disabled when the cell first loads. Furthermore, you aim to enable the slider when a button within the same cell is pressed. Surprisingly, while the properties are updated, the UISlider does not visually reflect this change until interacted with again, appearing greyed out. This frustrating scenario can lead to a lack of clarity and poor user experience.

Key points regarding the problem:

UISlider appears disabled despite the isEnabled property being set to true when using a button action.

Traditional approaches such as calling reloadData() are not desirable as they refresh the entire table view.

The Solution: Proper Data Management and Cell Refreshing

1. Rethinking Cell as Data Display

The first step to resolving this issue is re-evaluating how you handle cell data. Cells shouldn't be seen as data storage; instead, they should be considered display units. Create a struct to maintain the cell's state.

Struct Example

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2. Implementing a Delegate

Introduce a delegate protocol that facilitates communication between your UITableViewCell and its parent ViewController.

Protocol Declaration

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3. Custom Cell Class Setup

Within your custom cell class, add a function that detects the button's interaction and communicates with the ViewController using the delegate.

Sample Custom Cell Class

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4. ViewController Configuration

In your ViewController, maintain an array to store the state of each cell. Initialize this array in your viewDidLoad method.

Example ViewController Class

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5. Update Cell Appearance in cellForRowAt

In the cellForRowAt method of your UITableViewDataSource implementation, set the isUserInteractionEnabled and alpha properties of the UISlider based on the stored data.

Example Implementation

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Conclusion

By following this structured approach, you can effectively manage the state of your UISlider within a custom UITableViewCell without experiencing visual glitches. This solution empowers your table cells to reflect dynamic changes immediately upon user interaction, enhancing the overall usability of your application.

Feel free to tweak and expand upon this foundation to fit your specific needs—happy coding!