Uicollectionview单元格仅在文本周围换行

UICollectionView是iOS开发中常用的视图容器，用于展示多个可滚动的单元格。每个单元格可以包含不同类型的内容，包括文本、图像、按钮等。

在UICollectionView中，单元格的布局由UICollectionViewLayout决定。UICollectionViewLayout定义了单元格的大小、位置和排列方式。常用的布局包括UICollectionViewFlowLayout和UICollectionViewCompositionalLayout。

对于需要在文本周围换行的UICollectionView单元格，可以通过自定义单元格的布局来实现。一种常见的做法是使用自定义的UICollectionViewFlowLayout，并在单元格的布局中设置文本的换行方式。

以下是一个示例的UICollectionViewFlowLayout的子类，用于实现在文本周围换行的效果：

class WrapTextFlowLayout: UICollectionViewFlowLayout {
    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)
        
        for attribute in attributes ?? [] {
            if attribute.representedElementKind == nil {
                let indexPath = attribute.indexPath
                if let cellAttributes = layoutAttributesForItem(at: indexPath) {
                    attribute.frame = cellAttributes.frame
                }
            }
        }
        
        return attributes
    }
    
    override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
        let currentItemAttributes = super.layoutAttributesForItem(at: indexPath)?.copy() as? UICollectionViewLayoutAttributes
        
        guard let collectionView = collectionView else {
            return currentItemAttributes
        }
        
        let sectionInset = evaluatedSectionInsetForItem(at: indexPath.section)
        let isFirstItemInSection = indexPath.item == 0
        let layoutWidth = collectionView.frame.width - sectionInset.left - sectionInset.right
        
        if isFirstItemInSection {
            currentItemAttributes?.leftAlignFrame(withSectionInset: sectionInset)
            return currentItemAttributes
        }
        
        let previousIndexPath = IndexPath(item: indexPath.item - 1, section: indexPath.section)
        guard let previousFrame = layoutAttributesForItem(at: previousIndexPath)?.frame else {
            return currentItemAttributes
        }
        
        let previousFrameRightPoint = previousFrame.origin.x + previousFrame.width
        let currentFrame = currentItemAttributes?.frame ?? CGRect.zero
        let strecthedCurrentFrame = CGRect(x: sectionInset.left,
                                           y: currentFrame.origin.y,
                                           width: layoutWidth,
                                           height: currentFrame.size.height)
        
        let isFirstItemInRow = !previousFrame.intersects(strecthedCurrentFrame)
        
        if isFirstItemInRow {
            currentItemAttributes?.leftAlignFrame(withSectionInset: sectionInset)
            return currentItemAttributes
        }
        
        var frame = currentItemAttributes?.frame ?? CGRect.zero
        frame.origin.x = previousFrameRightPoint + evaluatedMinimumInteritemSpacingForSection(at: indexPath.section)
        currentItemAttributes?.frame = frame
        return currentItemAttributes
    }
    
    private func evaluatedSectionInsetForItem(at index: Int) -> UIEdgeInsets {
        if let delegate = collectionView?.delegate as? UICollectionViewDelegateFlowLayout,
           let inset = delegate.collectionView?(collectionView!, layout: self, insetForSectionAt: index) {
            return inset
        } else {
            return sectionInset
        }
    }
    
    private func evaluatedMinimumInteritemSpacingForSection(at index: Int) -> CGFloat {
        if let delegate = collectionView?.delegate as? UICollectionViewDelegateFlowLayout,
           let spacing = delegate.collectionView?(collectionView!, layout: self, minimumInteritemSpacingForSectionAt: index) {
            return spacing
        } else {
            return minimumInteritemSpacing
        }
    }
}

extension UICollectionViewLayoutAttributes {
    func leftAlignFrame(withSectionInset sectionInset: UIEdgeInsets) {
        var frame = self.frame
        frame.origin.x = sectionInset.left
        self.frame = frame
    }
}

使用上述自定义布局类，可以实现在UICollectionView单元格中文本周围换行的效果。在实际使用时，可以将该布局类应用于UICollectionView，并设置相应的文本内容。

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