如何将图像视图转换为自定义形状（swift3）

Question

我试图将单个图像转换为在右边的对象中输出。这是与How to make imageview with different shape in swift非常类似的问题。然而，这是迅速2。我试过了，它在swift3中似乎不起作用。

Answer 1

尝试这样的：

extension UIImageView { 
    func addMask(_ bezierPath: UIBezierPath) { 
     let pathMask = CAShapeLayer() 
     pathMask.path = bezierPath.cgPath 
     layer.mask = pathMask 
    } 
} 

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测试操场：

let myPicture = UIImage(data: try! Data(contentsOf: URL(string:"http://i.stack.imgur.com/Xs4RX.jpg")!))! 
let iv = UIImageView(image: myPicture) 

let bezierPath = UIBezierPath() 
bezierPath.move(to: iv.center) 
bezierPath.addLine(to: CGPoint(x: iv.frame.maxX, y: 0)) 
bezierPath.addLine(to: CGPoint(x: iv.frame.maxX, y: iv.frame.maxY)) 
bezierPath.addLine(to: CGPoint(x: 0, y: iv.frame.maxY)) 
bezierPath.addLine(to: .zero) 
bezierPath.close() 

iv.addMask(bezierPath)