16进制转rgb

- (void)colorWithHexString: (NSString *) stringToConvert

 {

         //去掉前后空格换行符

         NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]] uppercaseString];

    

                       

           if ([cString hasPrefix:@"0X"])

                 cString = [cString substringFromIndex:2];

         else if ([cString hasPrefix:@"#"])

                 cString = [cString substringFromIndex:1];

    

        

             

            

    

         // 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];

    

         unsigned int r, g, b;

         [[NSScanner scannerWithString:rString] scanHexInt:&r];

         [[NSScanner scannerWithString:gString] scanHexInt:&g];

         [[NSScanner scannerWithString:bString] scanHexInt:&b];

         NSLog(@"r = %u, g = %u, b = %u",r, g, b);

         

     }

转载于:https://www.cnblogs.com/sgdkg/p/3156682.html