ios - UICollectionView 间距不相等

Question

我有一个具有标准宽度和可变高度单元格的垂直UICollectionView。我对间距有疑问。对于单元格的每个高度，单元格后面的间距不同:

UICollectionView 的屏幕截图

Answer 1

UICollectionView 具有 delegate属性(property)。您应该实现 UICollectionViewDelegateFlowLayout在某些类中，例如 View Controller 。

此方法负责间距:

// 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
}