Convert RGB to HEX

// Convert the RGB numbers to hex strings
NSString *redHexValue=[NSString stringWithFormat:@"%02x", redIntValue];
NSString *greenHexValue=[NSString stringWithFormat:@"%02x", greenIntValue];
NSString *blueHexValue=[NSString stringWithFormat:@"%02x", blueIntValue];

// Concatenate with a "#"
NSString * hexColor = [NSString stringWithFormat:@"#%@%@%@",
redHexValue,greenHexValue, blueHexValue];