当半径等于高度时，UIBezierPath 拐角显示不正确答案

【问题标题】：UIBezierPath corner didn't show correct when radius equalTo height当半径等于高度时，UIBezierPath 拐角显示不正确
【发布时间】：2020-08-02 10:27:56
【问题描述】：

这里是测试代码，你可以复制测试一下：

override func viewDidLoad() {
    super.viewDidLoad()
    
    let blueView = UIView(frame: .init(x: 20, y: 100, width: 100, height: 40))
    blueView.backgroundColor = .blue
    view.addSubview(blueView)
    let blueViewPath = UIBezierPath.init(roundedRect: blueView.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: .init(width: 20, height: 20))
    let blueViewLayer = CAShapeLayer()
    blueViewLayer.frame = blueView.bounds
    blueViewLayer.path = blueViewPath.cgPath
    blueView.layer.mask = blueViewLayer
    
    let orangeView = UIView(frame: .init(x: 20, y: 150, width: 100, height: 40))
    orangeView.backgroundColor = .orange
    view.addSubview(orangeView)
    let orangeViewPath = UIBezierPath.init(roundedRect: orangeView.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: .init(width: 40, height: 40))
    let orangeViewLayer = CAShapeLayer()
    orangeViewLayer.frame = orangeView.bounds
    orangeViewLayer.path = orangeViewPath.cgPath
    orangeView.layer.mask = orangeViewLayer
}

blueView和orangeView的高度都是40，blueView的半径是20，orangeView的半径是40。

但正如你所见，orangeView 的半径看起来像 20。

为什么？如何解决？

【问题讨论】：

标签： ios swift uibezierpath

【解决方案1】：

根据Apple Documentation，请阅读以了解其这样做的原因

bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:

每个角椭圆的半径。大于一半的值矩形的宽度或高度被适当地限制为一半宽度或高度。

【讨论】：

【解决方案2】：

解决方案：

let orangeView = UIView(frame: .init(x: 150, y: 100, width: 260, height: 40))
orangeView.backgroundColor = .orange
view.addSubview(orangeView)
let orangeViewPath = UIBezierPath.init(roundedRect: .init(x: 0, y: -40, width: 260, height: 80), byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: .init(width: 40, height: 40))
let orangeViewLayer = CAShapeLayer()
orangeViewLayer.frame = orangeView.bounds
orangeViewLayer.path = orangeViewPath.cgPath
orangeView.layer.mask = orangeViewLayer

【讨论】：