我认为最简单的方法是创建两个圆,作为普通的UIView
实例,并将它们的中心设置为父视图的左右边缘。
由于您将clipsToBounds
设置为true
,因此它们会被剪切,只有它们的一半会在屏幕上可见。
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
}
}
func setShadowPath() {
let path = UIBezierPath()
path.move(to: bounds.origin)
path.addLine(to: CGPoint(x: cutoutView.frame.minX, y: bounds.minY))
path.addArc(withCenter: CGPoint(x: cutoutView.frame.midX, y: bounds.minY),
radius: cutoutView.bounds.width/2, startAngle: .pi, endAngle: 0, clockwise: false)
path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
path.addLine(to: CGPoint(x: bounds.minX, y: bounds.maxY))
path.close()
layer.shadowPath = path.cgPath
}
func setupBackground() {
let backgroundLayer = CAShapeLayer()
backgroundLayer.path = layer.shadowPath
backgroundLayer.fillColor = UIColor.white.cgColor
layer.insertSublayer(backgroundLayer, at: 0)
}