swift 中的自定义 UIBezierPath（Arc 麻烦）

Question

我写这段代码：

let leftUpPath = UIBezierPath()
leftUpPath.move(to: CGPoint(x: 40, y: 40))
leftUpPath.addArc(withCenter: CGPoint(x: 40, y: 40),
    radius: 10,
    startAngle: CGFloat(Double.pi),
    endAngle: CGFloat(3*Double.pi),
    clockwise: true)
leftUpPath.addLine(to: CGPoint(x: 30, y: 50))
leftUpPath.addLine(to: CGPoint(x: 90, y: 50))
leftUpPath.addLine(to: CGPoint(x: 80, y: 30))
leftUpPath.addLine(to: CGPoint(x: 40, y: 30))

这在我的故事板中向我展示了这一点：

但我想要这个：

如果有人有解决办法，我想我的问题是我画弧的地方...谢谢你的帮助

Answer 1

第一个点和圆弧不正确。您需要：

let leftUpPath = UIBezierPath()
leftUpPath.move(to: CGPoint(x: 40, y: 30))
leftUpPath.addArc(withCenter: CGPoint(x: 40, y: 40),
                  radius: 10,
                  startAngle: .pi * 3 / 2,
                  endAngle: .pi,
                  clockwise: false)
leftUpPath.addLine(to: CGPoint(x: 30, y: 50))
leftUpPath.addLine(to: CGPoint(x: 90, y: 50))
leftUpPath.addLine(to: CGPoint(x: 80, y: 30))
leftUpPath.addLine(to: CGPoint(x: 40, y: 30))

swift 中的自定义 UIBezierPath（Arc 麻烦）

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