我想获得一个UIColor在Swift的RGB值：
@H_403_1@let swiftColor = UIColor(red: 1,green: 165/255,blue: 0,alpha: 1)
println("RGB Value is:");
println(swiftColor.getRGB()); <<<<<< How to do that ?
在Java中，我将这样做：
@H_403_1@Color cnew = new Color(); int iColor = cnew.rgb(1,165/255,0); System.out.println(iColor);我应该如何获得这个值？
没有内置的方法像Java getRGB()，但你可以
定义自己： @H_403_1@extension UIColor { func rgb() -> Int? { var fRed : CGFloat = 0 var fGreen : CGFloat = 0 var fBlue : CGFloat = 0 var fAlpha: CGFloat = 0 if self.getRed(&fRed,green: &fGreen,blue: &fBlue,alpha: &fAlpha) { let iRed = Int(fRed * 255.0) let iGreen = Int(fGreen * 255.0) let iBlue = Int(fBlue * 255.0) let iAlpha = Int(fAlpha * 255.0) // (Bits 24-31 are alpha,16-23 are red,8-15 are green,0-7 are blue). let rgb = (iAlpha << 24) + (iRed << 16) + (iGreen << 8) + iBlue return rgb } else { // Could not extract RGBA components: return nil } } }
原文链接：https://www.f2er.com/swift/320894.html定义自己： @H_403_1@extension UIColor { func rgb() -> Int? { var fRed : CGFloat = 0 var fGreen : CGFloat = 0 var fBlue : CGFloat = 0 var fAlpha: CGFloat = 0 if self.getRed(&fRed,green: &fGreen,blue: &fBlue,alpha: &fAlpha) { let iRed = Int(fRed * 255.0) let iGreen = Int(fGreen * 255.0) let iBlue = Int(fBlue * 255.0) let iAlpha = Int(fAlpha * 255.0) // (Bits 24-31 are alpha,16-23 are red,8-15 are green,0-7 are blue). let rgb = (iAlpha << 24) + (iRed << 16) + (iGreen << 8) + iBlue return rgb } else { // Could not extract RGBA components: return nil } } }
用法：
@H_403_1@let swiftColor = UIColor(red: 1,alpha: 1) if let rgb = swiftColor.rgb() { print(rgb) } else { print("conversion Failed") }注意，这只有在UIColor已定义在“RGB兼容”颜色空间(例如RGB，HSB或GrayScale)。它可能如果颜色是从CIColor或图案创建的，则失败图像，在这种情况下返回nil。
