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  • swift 获取UI上某点点颜色

    extension UIView
    {
        func colorOfPoint (point: CGPoint) -> UIColor
        {
            var pixel = UnsafePointer<CUnsignedChar>.alloc(4)
            let colorSpace = CGColorSpaceCreateDeviceRGB()
            let bitmapInfo = CGBitmapInfo.fromRaw(CGImageAlphaInfo.PremultipliedLast.toRaw())!
            let context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, bitmapInfo)
    
            CGContextTranslateCTM(context, -point.x, -point.y)
    
            self.layer.renderInContext(context)
    
            CGContextRelease(context)
            CGColorSpaceRelease(colorSpace)
    
            return UIColor(red: Float(pixel [0]) / 255.0, green: Float (pixel [1]) / 255.0, blue: Float (pixel [2]) / 255.0 , alpha: Float (pixel [3]) / 255.0)
        }
    }
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  • 原文地址:https://www.cnblogs.com/Free-Thinker/p/5949760.html
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