ios - 渐变不覆盖全帧 SWIFT

Question

我有以下 imageView 扩展:

extension UIImageView {
func addBlackGradientLayer(frame: CGRect){
    let gradient = CAGradientLayer()
    gradient.frame = frame
    gradient.colors = [UIColor.clear.cgColor, UIColor.black.cgColor]
    gradient.locations = [0.0, 1.0]
    self.layer.addSublayer(gradient)
}}

imageView.addBlackGradientLayer(frame: imageView.frame)

将其应用于 imageView 时，我得到以下输出。我尝试设置约束以及自动布局。

执行后的输出如下:

Answer 1

你需要打电话

imageView.addBlackGradientLayer(frame: imageView.bounds)

参见:Cocoa: What's the difference between the frame and the bounds?