Question

我已创建此功能以围绕UIImageView上的特定角落：

func roundCorners(corners: [UIRectCorner], imageView: UIImageView) -> CAShapeLayer {
    let maskPath = UIBezierPath.init(roundedRect: imageView.bounds, byRoundingCorners:[.topLeft], cornerRadii: CGSize.init(width: 7.0, height: 7.0))
    let maskLayer = CAShapeLayer()
    maskLayer.frame = imageView.frame
    maskLayer.path = maskPath.cgPath
    return maskLayer
}

当我将其应用于topLeftImage这样的图像时topLeftImage.layer.mask = roundCorners(corners: [.topLeft], imageView: topLeftImage)，它会使图像消失。以下是我声明图像的方式：

let topLeftImage: UIImageView = {
    let iv = UIImageView()
    iv.image = #imageLiteral(resourceName: "myImage")
    iv.layoutIfNeeded()
    iv.translatesAutoresizingMaskIntoConstraints = false
    iv.contentMode = UIViewContentMode.scaleAspectFill
    iv.layer.masksToBounds = true
    iv.clipsToBounds = true
    return iv
}()

如何应用图层蒙版并仍然在屏幕上显示图像。

Answer 1

我认为图像没有出现在屏幕上，因为你没有用框架初始化UIImageView。请尝试以下代码段：

let iv = UIImageView(frame: CGRect(x: 10, y: 10, width: 100, height: 100))

尝试添加图层蒙版时，UIImage会消失

1 个答案: