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我正在尝试创建标签流布局。为此，我遵循了一个非常好的教程https://codentrick.com/create-a-tag-flow-layout-with-uicollectionview/

我设法创建和自定义流布局，但有时单元格未正确对齐。这是iphone 4S的截图。我也有两个标题部分

在此处输入图像描述

正如您在第 1 节中看到的，标签放置不正确。我不明白是什么导致了这个问题。

这是我的自定义流布局类

import UIKit

class FlowLayout: UICollectionViewFlowLayout {

    override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        var newAttributesForElementsInRect = [UICollectionViewLayoutAttributes]()        
        // unwrap super's attributes
        guard let attributesForElementsInRect = super.layoutAttributesForElementsInRect(rect) else { return nil }

        // modify attributes

        var leftMargin: CGFloat = 8.0;

        for attributes in attributesForElementsInRect {

            let itemAttributesCopy = attributes.copy() as! UICollectionViewLayoutAttributes

           print("attCopy",itemAttributesCopy.frame.size.width)
            print("left",leftMargin)
            print("collWidth",self.collectionView?.frame.size.width)

            print("sectionInset",self.sectionInset.left)

            if( itemAttributesCopy.frame.size.width + leftMargin > self.collectionView?.frame.size.width)
            {
                leftMargin = 8.0
            }
            if (itemAttributesCopy.frame.origin.x == self.sectionInset.left) {
                leftMargin = self.sectionInset.left
            } else {

                 print("itemAttributeCopy",itemAttributesCopy.frame)

                var newLeftAlignedFrame = itemAttributesCopy.frame
                newLeftAlignedFrame.origin.x = leftMargin
                itemAttributesCopy.frame = newLeftAlignedFrame
                 print("newFrame",newLeftAlignedFrame)
            }
            leftMargin += itemAttributesCopy.frame.size.width + 8
             print("finalleftMargin",leftMargin)



            newAttributesForElementsInRect.append(itemAttributesCopy)
        }

        return newAttributesForElementsInRect
    }
}

所以我需要帮助来解决这个问题。

问候兰吉特

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