Скачать или смотреть Creating an Infinite Horizontal CollectionView in iOS: How to Display Cells with Ease

Discover how to implement an infinite horizontal `UICollectionView` in iOS using Swift while enabling the first cell to scroll left.
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This video is based on the question https://stackoverflow.com/q/76617991/ asked by the user 'Louiza A' ( https://stackoverflow.com/u/21418531/ ) and on the answer https://stackoverflow.com/a/76621026/ 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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Creating an Infinite Horizontal CollectionView in iOS

If you’re a developer working with iOS and Swift, you may have stumbled upon a challenge: implementing an infinite horizontal UICollectionView. You might want a carousel-like effect where users can scroll through content seamlessly. The twist? You want the first cell to be able to scroll left, revealing the last item from your database.

In this guide, we will guide you through this problem step-by-step, ensuring that even beginners can understand and apply these principles.

Understanding the Problem

To design a collection view that behaves like a carousel, we start with six items in our data set. When users scroll to the right, they can see the sequence:

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However, the goal is to make it so that when the user scrolls left from the first item, the collection view seamlessly reveals the last item from the dataset, resulting in:

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Step-by-Step Solution

Step 1: Set Up Your Data Source

Let's define our data source using a simple string array:

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Step 2: Implement cellForItemAt

This method will allow us to configure each cell in our collection view. Create a custom cell class and set it up as follows:

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Step 3: Set Large Total Cells

To allow for an infinite scroll effect, we will set the total number of cells to a very high number which users are unlikely to reach:

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Step 4: Configure viewDidLayoutSubviews

In this method, we need to ensure our collection view scrolls to the halfway mark of our total cells and set up the item size based on the collection view's width.

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Step 5: Create Your UICollectionViewCell

Define a simple UICollectionViewCell as follows:

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Step 6: Full Example of the ViewController

Finally, wrap everything up in your view controller, keeping in mind to register your cell class, and implement the required delegate and data source methods.

Here’s how your complete view controller might look:

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Conclusion

By following these steps, you can create an infinite horizontal scrolling UICollectionView in your iOS application, which not only displays items as intended but also allows the first and last items to be accessible easily. This technique adds a professional touch to your app's UI and improves the overall user experience. Happy coding!