ios - 我想在 Swift 中的 ScrollView 底部创建 UIView 圆形形状

Question

不在顶部边缘。我想在底部边缘和 ScrollView 内部这样做。如何做到这一点

Answer 1

这应该接近你想要的。如果不完全正确，请使用贝塞尔曲线路径点:

@IBDesignable
class MyRoundBottomView: UIView {

    override func layoutSubviews() {
        super.layoutSubviews()

        let y = bounds.size.height - 80.0

        let p1 = CGPoint(x: 0.0, y: y)
        let p2 = CGPoint(x: bounds.size.width, y: y)

        let cp1 = CGPoint(x: p1.x, y: bounds.size.height)
        let cp2 = CGPoint(x: bounds.size.width, y: bounds.size.height)

        let myBez = UIBezierPath()

        myBez.move(to: CGPoint(x: 0.0, y: y))

        myBez.addCurve(to: p2, controlPoint1: cp1, controlPoint2: cp2)

        myBez.addLine(to: CGPoint(x: bounds.size.width, y: 0.0))
        myBez.addLine(to: CGPoint.zero)

        myBez.close()

        let l = CAShapeLayer()
        l.path = myBez.cgPath
        layer.mask = l

    }

}

它被标记为@IBDesignable，因此您可以添加UIView(在 Storyboard中)并将其自定义类分配给MyRoundBottomView，然后您将在设计时查看它: