如何在swift中剪切uiview的边缘

Question

我附上了查看图片.我想在购买按钮和上面的航班信息视图之间实现底部的小切.

Answer 1

我认为最简单的方法是创建2个圆作为普通UIView实例,并将它们的中心分别设置为父视图的左右边缘.

由于您设置clipsToBounds为true,它们将被剪裁,并且屏幕上只能显示其中一半.

public class TestView: UIView {

    private let leftCircle = UIView(frame: .zero)
    private let rightCircle = UIView(frame: .zero)

    public var circleY: CGFloat = 0
    public var circleRadius: CGFloat = 0

    public override init(frame: CGRect) {
        super.init(frame: frame)
        clipsToBounds = true
        addSubview(leftCircle)
        addSubview(rightCircle)
    }

    public override func layoutSubviews() {
        super.layoutSubviews()

        leftCircle.frame = CGRect(x: -circleRadius, y: circleY,
                                  width: circleRadius * 2 , height: circleRadius * 2)
        leftCircle.layer.masksToBounds = true
        leftCircle.layer.cornerRadius = circleRadius

        rightCircle.frame = CGRect(x: bounds.width - circleRadius, y: circleY,
                                   width: circleRadius * 2 , height: circleRadius * 2)
        rightCircle.layer.masksToBounds = true
        rightCircle.layer.cornerRadius = circleRadius
    }
}

我已经创建了一个示例项目来证明这一点.以下是它在我的模拟器中的外观(iPhone SE 11.2):