IOS中十六进制的颜色转换为UIColor

    #pragma mark - 颜色转换 IOS中十六进制的颜色转换为UIColor  
    + (UIColor *) colorWithHexString: (NSString *)color  
    {  
        NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];  
          
        // String should be 6 or 8 characters  
        if ([cString length] < 6) {  
            return [UIColor clearColor];  
        }  
          
        // 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 clearColor];  
          
        // Separate into r, g, b substrings  
        NSRange range;  
        range.location = 0;  
        range.length = 2;  
          
        //r  
        NSString *rString = [cString substringWithRange:range];  
          
        //g  
        range.location = 2;  
        NSString *gString = [cString substringWithRange:range];  
          
        //b  
        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];  
    }  

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