UICollectionView间距不相等

Question

我有一个标准宽度和可变高度单元格的垂直display: inline-block。我的间距有问题。对于单元格的每个高度，单元格之后的间距是不同的：

UICollectionView的截图

Answer 1

UICollectionView具有delegate属性。您应该在某些类中实现UICollectionViewDelegateFlowLayout，例如View Controller。

这种方法负责间距：

// Space around the section.
func collectionView(_ collectionView: UICollectionView, 
                   layout collectionViewLayout: UICollectionViewLayout, 
                   insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
}

// In case of vertical layout this is a vertical space between horizontal rows inside of each section
func collectionView(_ collectionView: UICollectionView, 
                    layout collectionViewLayout: UICollectionViewLayout, 
                    minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 20
}

// Horizontal space between items in row
func collectionView(_ collectionView: UICollectionView, 
                    layout collectionViewLayout: UICollectionViewLayout,  
                    minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 20
}