我有各种CAShapeLayers
,每个都有独特的颜色,如下所示:
shape1.strokeColor = UIColor(red: 85/255.0, green: 176/255.0, blue: 112/255.0, alpha: 1.0).
shape2.strokeColor = UIColor(red: 222/255.0, green: 171/255.0, blue: 66/255.0, alpha: 1.0).CGColor
使用touchesBegan
函数,我想确定是否已点击CAShapeLayer
以及它是哪一个,以便进行合适的操作。我知道可以使用hitTest
和CGPathContainsPoint
,但我想使用不同的方法。如何比较点击的点的颜色与CAShapeLayers
的颜色?
任何帮助将不胜感激
答案 0 :(得分:0)
此方法应该用于找出触摸点的像素颜色:
func colorAtPoint(point:CGPoint) -> UIColor
{
var pixels = UnsafeMutablePointer<CUnsignedChar>.alloc(4)
var colorSpace = CGColorSpaceCreateDeviceRGB()
var bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
var context = CGBitmapContextCreate(pixels, 1, 1, 8, 4, colorSpace, bitmapInfo)
CGContextTranslateCTM(context, -point.x, -point.y)
shapeLayer.renderInContext(context)
var color:UIColor = UIColor(red: CGFloat(pixels[0])/255.0, green: CGFloat(pixels[1])/255.0, blue: CGFloat(pixels[2])/255.0, alpha: CGFloat(pixels[3])/255.0)
pixels.dealloc(4)
return color
}