如何将 UIView 裁剪为半圆? [英] How to crop the UIView as semi circle?

问题描述

我想将 UIView 裁剪成半圆形

I want to crop UIView in semi circle shape

提前致谢.

推荐答案

一个方便的方法是将 UIView 子类化，在它上面添加一个图层，如果它不是默认的，则使视图颜色透明.

A convenient way is just subclass a UIView, add a layer on it and make the view color transparent if it's not by default.

import UIKit

class SemiCirleView: UIView {

    var semiCirleLayer: CAShapeLayer!

    override func layoutSubviews() {
        super.layoutSubviews()

        if semiCirleLayer == nil {
            let arcCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
            let circleRadius = bounds.size.width / 2
            let circlePath = UIBezierPath(arcCenter: arcCenter, radius: circleRadius, startAngle: CGFloat.pi, endAngle: CGFloat.pi * 2, clockwise: true)

            semiCirleLayer = CAShapeLayer()
            semiCirleLayer.path = circlePath.cgPath
            semiCirleLayer.fillColor = UIColor.red.cgColor
            layer.addSublayer(semiCirleLayer)

            // Make the view color transparent
            backgroundColor = UIColor.clear
        }
    }    
}

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