将UIColor转换为RGB值

//将UIColor转换为RGB值
- (NSMutableArray *) changeUIColorToRGB:(UIColor *)color
{
    NSMutableArray *RGBStrValueArr = [[NSMutableArray alloc] init];
    NSString *RGBStr = nil;
    //获得RGB值描述
    NSString *RGBValue = [NSString stringWithFormat:@"%@",color];
    //将RGB值描述分隔成字符串
    NSArray *RGBArr = [RGBValue componentsSeparatedByString:@" "];
    //获取红色值
    int r = [[RGBArr objectAtIndex:1] intValue] * 255;
    RGBStr = [NSString stringWithFormat:@"%d",r];
    [RGBStrValueArr addObject:RGBStr];
    //获取绿色值
    int g = [[RGBArr objectAtIndex:2] intValue] * 255;
    RGBStr = [NSString stringWithFormat:@"%d",g];
    [RGBStrValueArr addObject:RGBStr];
    //获取蓝色值
    int b = [[RGBArr objectAtIndex:3] intValue] * 255;
    RGBStr = [NSString stringWithFormat:@"%d",b];
    [RGBStrValueArr addObject:RGBStr];
    //返回保存RGB值的数组
    return [RGBStrValueArr autorelease];
}

//16进制颜色(html颜色值)字符串转为UIColor
+(UIColor *) hexStringToColor: (NSString *) stringToConvert
{
     NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
     // String should be 6 or 8 characters
   
     if ([cString length] < 6) return [UIColor blackColor];
     // strip 0X if it appears
     if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];
     if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];
     if ([cString length] != 6) return [UIColor blackColor];
   
     // Separate into r, g, b substrings
   
     NSRange range;
     range.location = 0;
     range.length = 2;
     NSString *rString = [cString substringWithRange:range];
     range.location = 2;
     NSString *gString = [cString substringWithRange:range];
     range.location = 4;
     NSString *bString = [cString substringWithRange:range];
     // Scan values
     unsigned int r, g, b;
   
     [[NSScanner scannerWithString:rString] scanHexInt:&r];
     [[NSScanner scannerWithString:gString] scanHexInt:&g];
     [[NSScanner scannerWithString:bString] scanHexInt:&b];
   
     return [UIColor colorWithRed:((float) r / 255.0f)
                                 green:((float) g / 255.0f)
                                   blue:((float) b / 255.0f)
                                 alpha:1.0f];
}

- (NSMutableArray *) changeUIColorToRGB:(UIColor *)color
{
    size_t  n = CGColorGetNumberOfComponents(color.CGColor);
    const CGFloat *rgba = CGColorGetComponents(color.CGColor);
    NSMutableArray *resultArr = [NSMutableArray arrayWithCapacity:n];
    for (int i=0; i

【OBJC类扩展之Hex值颜色转换】UIColor+Hex
#import 

@interface UIColor (Hex)

+ (UIColor *)colorWithHex:(long)hexColor;
+ (UIColor *)colorWithHex:(long)hexColor alpha:(float)opacity;

@end


#import "UIColor+Hex.h"

@implementation UIColor (Hex)

+ (UIColor*) colorWithHex:(long)hexColor;
{
    return [UIColor colorWithHex:hexColor alpha:1.];    
}

+ (UIColor *)colorWithHex:(long)hexColor alpha:(float)opacity
{
    float red = ((float)((hexColor & 0xFF0000) >> 16))/255.0;
    float green = ((float)((hexColor & 0xFF00) >> 8))/255.0;
    float blue = ((float)(hexColor & 0xFF))/255.0;
    return [UIColor colorWithRed:red green:green blue:blue alpha:opacity];  
}   

@end