Custom UICollectionView for Dynamic Tag Display

CJCollectionView is a custom implementation of UICollectionView designed specifically for displaying recommendation tags. In iOS development, UICollectionView is a versatile component that allows developers to present scrollable collections of data flexibly. CJCollectionView is optimized for cases with varying text lengths and an unpredictable number of tags, automatically calculating the size of each tag view and wrapping text when necessary to fit the screen. UICollectionView consists of cells (UICollectionViewCell), each of which can display different content. In the case of CJCollectionView, these cells typically represent a tag. Developers can override the UICollectionViewDataSource methods to provide data and customize the appearance of the cells. To handle different text lengths, CJCollectionView dynamically adjusts the size of the cells, typically by implementing the `collectionView(_:layout:sizeForItemAt:)` method, which calculates the width based on the text content of each tag, ensuring complete visibility. Additional logic may be needed to manage line breaks for the last tag when there is insufficient screen space. CJCollectionView supports automatic line breaks by extending and customizing UICollectionViewFlowLayout, calculating the total width of the current row, and moving overflow tags to the next row. Appropriate margin constraints are set to maintain spacing and overall layout aesthetics. Developers may need to create a custom UICollectionViewFlowLayout subclass, overriding methods like `layoutAttributesForElements(in:)` and `shouldInvalidateLayout(for:)` to update layout attributes and re-layout when necessary. CJCollectionView may also include features such as tag click handling, animations, and custom styles. For example, implementing `collectionView(_:didSelectItemAt:)` allows responding to tag clicks with specific actions. Style customization can be achieved by adjusting cell properties such as background color, text color, font, and border to achieve the desired visual effect. Overall, CJCollectionView is a practical component for iOS development, addressing the challenge of displaying a variable number of tags with differing lengths within limited screen space. It provides clear and readable tag display through effective layout calculations and custom layout classes. CJCollectionView's source code is a valuable resource for developers dealing with similar requirements, offering insights into UICollectionView usage and customization.