UIColor creators

UIColor+fun.m

// UIColor* red = rgb(255,0,0);
// UIColor* steelblue = [UIColor fromHex:0x4682B4];
// UIColor* shade = rgba(150,150,150,0.5);

UIColor* rgba(CGFloat r, CGFloat g, CGFloat b, CGFloat a) {
    return [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:a];
}
UIColor* rgb(CGFloat r, CGFloat g, CGFloat b) {
    return rgba(r, g, b, 1.0);
}
UIColor* hsva(CGFloat h, CGFloat s, CGFloat v, CGFloat a) {
    return [UIColor colorWithHue:h/360.0 saturation:s/100.0 brightness:v/100.0 alpha:a/100.0];
}
UIColor* hsv(CGFloat h, CGFloat s, CGFloat v) {
    return hsva(h, s, v, 100.0);
}

@implementation UIColor (Fun)
+ (instancetype)colorFromHex:(int)num {
    return [self colorFromHex:num alpha:1.0];
}
+ (instancetype)colorFromHex:(int)num alpha:(CGFloat)alpha {
    CGFloat r = (num & 0xFF0000) >> 16;
    CGFloat g = (num & 0x00FF00) >> 8;
    CGFloat b = (num & 0x0000FF) >> 0;
    return rgb(r,g,b);
}
@end