CAShapeLayer攻略

Question

我正在使用CAShapeLayer在视图中绘制一些形状。我做了一个功能来管理这个。因此，举例来说：

在viewDidLoad()

drawQuad(UIColor(red: 0.600, green: 0.224, blue: 0.341, alpha: 1.00), firstPoint: CGPointMake(screenWidth * -0.159, screenHeight * 0.249), secondPoint: CGPointMake(screenWidth * 0.65, screenHeight * 0.249), thirdPoint: CGPointMake(screenWidth * 1.01, screenHeight * 0.50), fourthPoint: CGPointMake(screenWidth * 0.399, screenHeight * 0.50)) 

在drawQuad(...)

func drawQuad(fillColor: UIColor, firstPoint: CGPoint, secondPoint: CGPoint, thirdPoint: CGPoint, fourthPoint: CGPoint) { 
    let screenWidth = screenSize.width 
    let screenHeight = screenSize.height 

    let shape = CAShapeLayer() 
    containerLayer.addSublayer(shape) 
    shape.lineJoin = kCALineJoinMiter 
    shape.fillColor = fillColor.CGColor 

    let path = UIBezierPath() 
    path.moveToPoint(firstPoint) 
    path.addLineToPoint(secondPoint) 
    path.addLineToPoint(thirdPoint) 
    path.addLineToPoint(fourthPoint) 

    path.closePath() 
    shape.path = path.CGPath 
} 

我越来越坚持与努力发挥识别添加到每个形状。我试图做的是创建一个容器CAShapeLayer，保持每个形状作为一个子层。如果你看看上面的函数，你会在第6行看到它。然后，在viewDidLoad()中，我将最后的容器层添加到视图中。

这样做的关键是要能够做一个hitTest这样的：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) { 
    let touch = touches.first as! UITouch 
    let location = touch.locationInView(self.view) 

    for layer in containerLayer.sublayers { 
     if let hitLayer = layer.hitTest(location) { 
      println("Tapped") 
     } 
    } 
} 

不幸的是，这似乎并不奏效。有谁知道我正在犯的错误？或者，也许我正在以这种错误的方式去做？

谢谢！

Answer 1

尝试使用CGPathContainsPoint来检查图层路径中是否包含触摸的位置。