渐变未覆盖全帧 SWIFT [英] Gradient not covering full frame SWIFT

问题描述

我对 imageView 有以下扩展:

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)

在将其应用于 imageView 时，我有以下输出.我尝试设置约束以及自动布局.

on applying this to the imageView, I am having the following output. I tried setting the constraints and also, the autolayout.

以下是执行后的输出:

推荐答案

需要致电

imageView.addBlackGradientLayer(frame: imageView.bounds)

参见:Cocoa:框架和边界?

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