ios - Swift 使边框 rof uiimageview 在外面

Question

我想为 imageview 添加边框，这是我的代码

    let view = UIImageView()
    view.layer.borderWidth = 4
    view.layer.borderColor = UIColor(red: 1, green: 1, blue: 1, alpha:0.4).cgColor
    view.layer.cornerRadius = 40
    view.layer.masksToBounds = true

但这只会在 imageview 内部添加边框，我怎样才能在外部添加边框？

Answer 1

这可以帮到你。使用 CALayer 添加边框层，您可以自定义边框颜色和边框，以及其他参数。

let borderLayer = CALayer()
let borderFrame = CGRect(x: -1.0, y: -1.0, width: imageView.frame.size.height + 2.0, height: imageView.frame.size.height + 2.0)
borderLayer.backgroundColor = UIColor.clear.cgColor
borderLayer.frame = borderFrame
borderLayer.cornerRadius = 5.0
borderLayer.borderWidth = 2.0
borderLayer.borderColor = UIColor.red.cgColor
imageView.layer.addSublayer(borderLayer)