ios - 未为 UIColor UIDeviceRGBColorSpace 定义 CGColor 1 1 0 1

Question

应用程序崩溃，我的 Xcode 控制台出现此错误:

NSInvalidArgumentException', reason: '*** -CIColor not defined for the UIColor UIDeviceRGBColorSpace 1 1 0 1; need to first convert colorspace.

当我尝试显示 RGB 颜色的值时:

 var color:UIColor
 print("color \(color.CIColor.red)  \(color.CIColor.green)  \(color.CIColor.blue)")

Answer 1

来自 CIColor 文档:

var CIColor: CIColor { get }

The Core Image color associated with the receiver. (read-only) This property throws an exception if the color object was not initialized with a Core Image color.

使用getRed方法获取RGB:

var color = UIColor.redColor()
var fRed: CGFloat = 0
var fGreen: CGFloat = 0
var fBlue: CGFloat = 0
var fAlpha: CGFloat = 0
if color.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) {
    print("color \(fRed)  \(fGreen)  \(fBlue)")
} else {
    print("error: color could not be converted")
}