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#import "UIColor+MGLAdditions.h"
/* Portions based on Erica Sadun's uicolor-utilities
https://github.com/erica/uicolor-utilities */
@interface UIColor (MGLAdditionsPrivate)
+ (UIColor *)colorWithRGBHex:(UInt32)hex;
- (CGColorSpaceModel)colorSpaceModel;
- (BOOL)canProvideRGBComponents;
- (BOOL)red:(CGFloat *)red green:(CGFloat *)green blue:(CGFloat *)blue alpha:(CGFloat *)alpha;
- (UInt32)rgbHex;
@end
@implementation UIColor (MGLAdditions)
+ (UIColor *)colorWithRGBAString:(NSString *)rgbaString
{
UIColor *color;
NSString *numberString = [rgbaString stringByReplacingOccurrencesOfString:@"rgba("
withString:@""];
numberString = [numberString stringByReplacingOccurrencesOfString:@"rgb("
withString:@""];
numberString = [numberString stringByReplacingOccurrencesOfString:@")"
withString:@""];
NSArray *numbers = [numberString componentsSeparatedByString:@","];
if ([rgbaString hasPrefix:@"rgb("] && [numbers count] == 3)
{
color = [UIColor colorWithRed:[numbers[0] floatValue] / 255
green:[numbers[1] floatValue] / 255
blue:[numbers[2] floatValue] / 255
alpha:1.0];
}
else if ([rgbaString hasPrefix:@"rgba("] && [numbers count] == 4)
{
color = [UIColor colorWithRed:[numbers[0] floatValue] / 255
green:[numbers[1] floatValue] / 255
blue:[numbers[2] floatValue] / 255
alpha:[numbers[3] floatValue]];
}
return color;
}
- (NSString *)rgbaStringFromColor
{
CGFloat r,g,b,a;
[self getRed:&r green:&g blue:&b alpha:&a];
r *= 255;
g *= 255;
b *= 255;
a *= 255;
return [NSString stringWithFormat:@"rgba(%lu,%lu,%lu,%lu)", (unsigned long)r, (unsigned long)g, (unsigned long)b, (unsigned long)a];
}
+ (UIColor *)colorWithRGBHex:(UInt32)hex
{
int r = (hex >> 16) & 0xFF;
int g = (hex >> 8) & 0xFF;
int b = (hex) & 0xFF;
return [UIColor colorWithRed:r / 255.0f
green:g / 255.0f
blue:b / 255.0f
alpha:1.0f];
}
- (CGColorSpaceModel)colorSpaceModel
{
return CGColorSpaceGetModel(CGColorGetColorSpace(self.CGColor));
}
- (BOOL)canProvideRGBComponents
{
switch (self.colorSpaceModel)
{
case kCGColorSpaceModelRGB:
case kCGColorSpaceModelMonochrome:
{
return YES;
}
default:
{
return NO;
}
}
}
- (BOOL)red:(CGFloat *)red green:(CGFloat *)green blue:(CGFloat *)blue alpha:(CGFloat *)alpha
{
const CGFloat *components = CGColorGetComponents(self.CGColor);
CGFloat r,g,b,a;
switch (self.colorSpaceModel)
{
case kCGColorSpaceModelMonochrome:
{
r = g = b = components[0];
a = components[1];
break;
}
case kCGColorSpaceModelRGB:
{
r = components[0];
g = components[1];
b = components[2];
a = components[3];
break;
}
default:
{
return NO;
}
}
if (red) *red = r;
if (green) *green = g;
if (blue) *blue = b;
if (alpha) *alpha = a;
return YES;
}
- (UInt32)rgbHex
{
NSAssert(self.canProvideRGBComponents, @"Must be a RGB color to use rgbHex");
CGFloat r, g, b, a;
if ( ! [self red:&r green:&g blue:&b alpha:&a])
return 0;
r = fminf(fmaxf(r, 0.0f), 1.0f);
g = fminf(fmaxf(g, 0.0f), 1.0f);
b = fminf(fmaxf(b, 0.0f), 1.0f);
return (((int)roundf(r * 255)) << 16) | (((int)roundf(g * 255)) << 8) | (((int)roundf(b * 255)));
}
- (NSString *)hexStringFromColor
{
return [NSString stringWithFormat:@"%0.6X", (unsigned int)(self.rgbHex)];
}
+ (UIColor *)colorWithHexString:(NSString *)hexString
{
NSScanner *scanner = [NSScanner scannerWithString:[hexString stringByReplacingOccurrencesOfString:@"#" withString:@""]];
unsigned hexNum;
if ( ! [scanner scanHexInt:&hexNum])
return nil;
return [UIColor colorWithRGBHex:hexNum];
}
@end
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