16进制颜色(html颜色值)字符串转为UIColor

//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];
}