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Declaring a class method

suggest change

Header file UIColor+XYZPalette.h: 

@interface UIColor (XYZPalette)

+(UIColor *)xyz_indigoColor;

@end

and implementation UIColor+XYZPalette.m: 

@implementation UIColor (XYZPalette)

+(UIColor *)xyz_indigoColor
{
    return [UIColor colorWithRed:75/255.0f green:0/255.0f blue:130/255.0f alpha:1.0f];
}

@end
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