I am getting a UIColor returned from this method:
- (UIColor *)getUserSelectedColor { return [UIColor colorWithRed:redSlider.value green:greenSlider.value blue:blueSlider.value alpha:1.0]; }
and getting color like this:
UIColor *selectedColor = [(ColorPickerView *)alertView getUserSelectedColor];
Now I want to get red, green, blue from selectedColor, in order to use those values. I want values between 0 and 1.
let swiftColor = UIColor(red: 1, green: 165/255, blue: 0, alpha: 1) println("RGB Value is:"); println(swiftColor.
alpha. The opacity value of the new color object, specified as a value from 0.0 to 1.0.
In Objective-C, we use this code to set RGB color codes for views: #define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] view.
Alpha indicates how opaque each pixel is and allows an image to be combined over others using alpha compositing. rgba(red, green, blue, alpha) The alpha value is declared as a decimal number from 0 to 1, where 0 is fully transparent and 1 is fully opaque.
The reason for the crash when accessing SelectedColor.CGColor
could be that you do not retain the result from getColor
, perhaps what you need is:
SelectedColor = [[(ColorPickerView *)alertView getColor] retain];
You can only get the RGB color component from a UIColor
that is using the RGB color space, since you are using colorWithRed:green:blue:alpha:
that is not a problem, but be vary of this if your code changes.
With this is mind getting the color components is really easy:
const CGFloat* components = CGColorGetComponents(SelectedColor.CGColor); NSLog(@"Red: %f", components[0]); NSLog(@"Green: %f", components[1]); NSLog(@"Blue: %f", components[2]); NSLog(@"Alpha: %f", CGColorGetAlpha(SelectedColor.CGColor));
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