mask的用法
作者:
lieon | 来源:发表于
2020-12-16 13:59 被阅读0次
mask的用法
- mask是遮罩，它会挡住父视图的渲染
- 父视图渲染部分是mask不透明的像素点; mask透明部分，父视图部分就会不显示
let frame = CGRect(x: 0, y: 0, width: 300, height: 500)
let blueView = UIView(frame: frame)
blueView.backgroundColor = .blue
let redView = UIImageView(frame: frame)
redView.image = UIImage(named: "girl")
let mask = UIImageView(frame: frame)
mask.contentMode = .scaleAspectFit
mask.image = UIImage(named: "light")
redView.mask = mask
blueView.addSubview(redView)
view.backgroundColor = .white
view.addSubview(blueView)
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