UIBezierPath 和 CAShapeLayer

Question

我想得到一个上角圆角的矩形。为此，我使用UIBezierPath 和CAShapeLayer。

问题是左角是正确的，而右角不是，我不明白为什么会这样，我做错了什么。

使当前代码有效对我来说很重要，通过cornerRadius 或其他方式解决问题，不幸的是，我不感兴趣。

当前结果图片

和

必填结果图片 .

import UIKit

func getRadians(from degrees: CGFloat) -> CGFloat {
    return degrees * CGFloat.pi / 180
}

let view = UIView()
view.backgroundColor = .green

let width: CGFloat = 800
let height: CGFloat = 400

view.frame = CGRect(x: 0, y: 0, width: width, height: height)

let cornersRadius: CGFloat = 100
var path = UIBezierPath()

path.move(to: CGPoint(x: 0, y: 0))

path.addLine(to: CGPoint(x: width, y: 0))
path.addLine(to: CGPoint(x: width, y: height))

path.addLine(to: CGPoint(x: 0, y: height))
path.addLine(to: CGPoint(x: 0, y: 0))

path = path.reversing()

let topLeft = UIBezierPath()
topLeft.move(to: CGPoint(x: 0, y: cornersRadius))

topLeft.addLine(to: CGPoint(x: 0, y: 0))
topLeft.addLine(to: CGPoint(x: cornersRadius, y: 0))

topLeft.addArc(withCenter: CGPoint(x: cornersRadius, y: cornersRadius), radius: cornersRadius, startAngle: getRadians(from: 270), endAngle: getRadians(from: 180), clockwise: false)
topLeft

let topRight = UIBezierPath()
topRight.move(to: CGPoint(x: width, y: cornersRadius))

topRight.addLine(to: CGPoint(x: width, y: 0))
topRight.addLine(to: CGPoint(x: width - cornersRadius, y: 0))

topRight.addArc(withCenter: CGPoint(x: width - cornersRadius, y: cornersRadius), radius: cornersRadius, startAngle: getRadians(from: 270), endAngle: getRadians(from: 0), clockwise: true)
topRight

path.append(topLeft)
path.append(topRight)

let layer = CAShapeLayer()
layer.path = path.cgPath

view.layer.mask = layer
view

Answer 1

有一个更简单的方法来实现它。您可以使用以下方法：

init(roundedRect:byRoundingCorners:cornerRadii:) 为UIBezierPath

更多信息请关注Apple documentation

这里的用法示例：

let cornerRadius = CGFloat(10.0)
let roundedCorners = roundedCorners.union([.topLeft, .topRight])

let path = UIBezierPath(roundedRect:maskRect, byRoundingCorners:roundedCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))

let maskLayer = CAShapeLayer()
maskLayer.frame = YOUR_VIEW_TO_MASK.bounds
maskLayer.path = maskPath.cgPath

YOUR_VIEW_TO_MASK.layer.mask = maskLayer

Answer 2

使用单个 UIBezierPath：

let largeRadius: CGFloat = 100.0
let smallRadius: CGFloat = 12.0

let path = UIBezierPath()

// Bottom left
path.move(to: CGPoint(x: 0, y: height - smallRadius)
path.addLine(to: CGPoint(x: 0, y: largeRadius)

// Top left
path.addArc(withCenter: CGPoint(x: largeRadius, y: largeRadius), radius: largeRadius, startAngle: getRadians(from: 270), endAngle: getRadians(from: 0, clockwise: true))

// Top right
path.addLine(to: CGPoint(x: width - largeRadius, y: 0)
path.addArc(withCenter: CGPoint(x: width - largeRadius, y: largeRadius), radius: largeRadius, startAngle: getRadians(from: 0), endAngle: getRadians(from: 90))

// EITHER (rounded bottom corners):
// Bottom right 
path.addLine(to: CGPoint(x: width, y: height - smallRadius)
path.addArc(withCenter: CGPoint(x: width - smallRadius, y: height - smallRadius), radius: smallRadius, startAngle: getRadians(from: 90), endAngle: getRadians(from: 180))

// Bottom left
path.addLine(to: CGPoint(x: smallRadius, y: height - smallRadius))
path.addArc(withCenter: CGPoint(x: smallRadius, y: height - smallRadius), radius: smallRadius, startAngle: getRadians(from: 180), endAngle: getRadians(from: 270))

// OR (square bottom corners):
// Bottom right
path.addLine(to: CGPoint(x: width, y: height))

// Bottom left
path.addLine(to: CGPoint(x: 0, y: height))
path.close()
let layer = CAShapeLayer()
layer.path = path.cgPath

请注意，此代码提供了一种在底部添加较小圆角而不是使用单独的图层蒙版的方法，以及使用方形底角。

我也在对您的 getRadians() 函数做出假设。