How do I get red green blue (RGB) and alpha back from a UIColor object?

problem ：

I am getting a UIColor returned from this method: I return a from this method UIColor ：

- (UIColor *)getUserSelectedColor {       return [UIColor colorWithRed:redSlider.value green:greenSlider.value blue:blueSlider.value alpha:1.0];}

and getting color like this: And get this color ：

UIColor *selectedColor = [(ColorPickerView *)alertView getUserSelectedColor];

Now I want to get red, green, blue from selectedColor, in order to use those values. Now I want to start from selectedColor Get red in 、 green 、 Blue , To use these values .I want values between 0 and 1. I want 0 To 1 Between the value of the .

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Solution ：

Reference resources ： https://stackoom.com/en/question/6HMa