iphone-common-codes-ccteam源代码 CCUIColor.m

//
//  CCUIColor.m
//  CCFC
//
//  Created by xichen on 11-12-17.
//  Copyright 2011年 ccteam. All rights reserved.
//


#import "CCUIColor.h"




@implementation UIColor(cc)


// 获取UIColor的RGBA的值
- (void)getRGBAValue:(CGFloat *)red 
               green:(CGFloat *)green 
                blue:(CGFloat *)blue 
               alpha:(CGFloat *)alpha
{
        CGColorRef colorRef = [self CGColor];
        
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        if(red)
                *red = tmComponents[0];


        if(green)
                *green = tmComponents[1];
    
        if(blue)
                *blue = tmComponents[2];


        if(alpha)
                *alpha = tmComponents[3];
}


- (CGFloat)getRedValue
{
        CGColorRef colorRef = [self CGColor];
        
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        return tmComponents[0];
}


- (CGFloat)getGreenValue
{
        CGColorRef colorRef = [self CGColor];
        
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        return tmComponents[1];
}


- (CGFloat)getBlueValue
{
        CGColorRef colorRef = [self CGColor];
        
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        return tmComponents[2];
}


- (CGFloat)getAlphaValue
{
        CGColorRef colorRef = [self CGColor];
        
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        return tmComponents[3];
}


// 由RGB的值获得CGColorRef指针
// you should release the returnValue by your hand.
+ (CGColorRef)createCGColorRefByRGB:(CGFloat)red 
                              green:(CGFloat)green 
                               blue:(CGFloat)blue 
                              alpha:(CGFloat)alpha
{
        CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
        const CGFloat rgbColor[] = {(float)red / 255, (float)green / 255 , (float) blue / 255, (float) alpha / 255};
        CGColorRef color = CGColorCreate(rgb, rgbColor);
        CGColorSpaceRelease(rgb);
        
        return color;
}


// print the RGBA info of the UIColor
- (void)printRGBA
{
        CGColorRef colorRef = [self CGColor];
        const CGFloat *tmComponents = CGColorGetComponents(colorRef);
        NSLog(@"%@ R:%f, G:%f, B:%f, A:%f", 
                  self, tmComponents[0], tmComponents[1], tmComponents[2], tmComponents[3]);
}


@end

可能有更新:

googlecode链接地址：http://code.google.com/p/iphone-common-codes-ccteam/source/browse/trunk/CCFC/files/CCUIColor.m
github地址: https://github.com/cxsjabc/iphone-common-codes-ccteam/tree/master/CCFC/files/CCUIColor.m