[英]How to clip a UIView with a bezier path?
我不太確定要理解UIBezierPath
應該如何工作。
我在屏幕中間添加了一個簡單的UIView
,我想通過在其圖層上添加遮罩來對其進行裁剪。 我試了一下,以為我會在視圖中間看到像洛杉磯這樣的東西:
override func viewDidLoad() {
super.viewDidLoad()
viewToClip.backgroundColor = .white
let bezierPath = UIBezierPath()
bezierPath.move(to: viewToClip.center)
bezierPath.addLine(to: CGPoint(x: viewToClip.center.x - 5, y: viewToClip.center.y))
bezierPath.addLine(to: CGPoint(x: viewToClip.center.x, y: viewToClip.center.y - 5))
bezierPath.addLine(to: CGPoint(x: viewToClip.center.x + 5, y: viewToClip.center.y))
bezierPath.addLine(to: CGPoint(x: viewToClip.center.x, y: viewToClip.center.y + 5))
bezierPath.close()
let testLayer = CAShapeLayer()
testLayer.path = bezierPath.cgPath
viewToClip.layer.mask = testLayer
}
但是,相反,視圖只是從屏幕上消失了。 我究竟做錯了什么?
謝謝你的幫助。
你能試一下嗎
import UIKit
class bb: UIView {
var once:Bool = true
override func draw(_ rect: CGRect) {
if(once)
{
once = false
self.backgroundColor = .white
let bezierPath = UIBezierPath()
let cen = CGPoint.init(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
bezierPath.move(to: cen)
bezierPath.addLine(to: CGPoint(x: cen.x - 5, y: cen.y))
bezierPath.addLine(to: CGPoint(x: cen.x, y: cen.y - 5))
bezierPath.addLine(to: CGPoint(x: cen.x + 5, y: cen.y))
bezierPath.addLine(to: CGPoint(x: cen.x, y: cen.y + 5))
bezierPath.close()
let testLayer = CAShapeLayer()
testLayer.path = bezierPath.cgPath
testLayer.lineWidth = 1.0
testLayer.strokeColor = UIColor.blue.cgColor
testLayer.fillColor = UIColor.green.cgColor
self.layer.addSublayer(testLayer)
}
}
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