UICollectionViewLayoutAttributes 和变换

Question

我正在使用以下来修改 UICollectionViewLayoutAttributes。方法一有效，方法二无效，谁能帮忙解释一下区别？

guard let newAttrs = attributes?.copy() as? UICollectionViewLayoutAttributes, 
      let imageViewInfo = imageViewInfo else { return nil }

let center = imageViewInfo.center

//Method 1
newAttrs.transform = CGAffineTransform(scaleX: scale, y: scale)
let x = (newAttrs.center.x-center.x) * scale + igCenter.x
let y = (newAttrs.center.y-center.y) * scale + igCenter.y
newAttrs.center = CGPoint(x: x, y: y)

//Method 2
newAttrs.transform = CGAffineTransform(translationX: -center.x, y: -center.y)
  .scaledBy(x: scale, y: scale)
  .translatedBy(x: igCenter.x, y: igCenter.y)

Answer 1

https://developer.apple.com/documentation/uikit/uiview/1622459-transform

要更改视图/单元格的位置，请改为修改“中心”。