自定义形状可触摸区域 [英] Custom shape touchable area
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问题描述
我的形状如下,我希望将其设置为我的UIButton 的背景,但可触摸区域是一个矩形,
任何改变可触摸区域的建议塑造寄宿生?
I have a shape like below and I want set it as background to my UIButton but touchable area is a rectangle, any suggestion to change touchable area to shape boarders?
推荐答案
实际上我发现它就像并且工作得很好:
Actually I found it on this like and working perfectly:
如何知道如果.png的唯一可见区域是触及XCode(快速或客观C)
但必须更改如下代码:
func alphaFromPoint(point: CGPoint) -> CGFloat {
var pixel: [UInt8] = [0, 0, 0, 0]
let colorSpace = CGColorSpaceCreateDeviceRGB();
let alphaInfo : CGBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(&pixel, 1, 1, 8, 4, colorSpace, alphaInfo.rawValue) //need add .rawValue to alphaInfo
CGContextTranslateCTM(context, -point.x, -point.y);
self.layer.renderInContext(context!)
let floatAlpha = CGFloat(pixel[3])
return floatAlpha
}
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