How to concatenate strings

Let’s assume we have these strings:

    NSString *firstString = @"This is the start";
    NSString *secondString = @"of a great";
    NSString *thirdString = @" sentence that ends here";

The easiest way to concatenate two strings is by using the stringByAppendingString: method.

NSString *concatenatedString = [firstString stringByAppendingString:secondString];

If you would like to concatenate 3 strings then it’s probably easier to construct a new string out of the three by using stringWithFormat: method

    NSString *allThreeStrings = [NSString stringWithFormat:@"%@ %@ and boring %@",
                                 firstString, secondString, thirdString];

Or you could use NSMutableString like this:

    NSMutableString *mutableString = [NSMutableString stringWithString:firstString];
    [mutableString appendFormat:@"%@ %@", secondString, thirdString];

Or like this:

    NSMutableString *anotherOne = [NSMutableString stringWithString:firstString];
    [anotherOne appendString:secondString];
    [anotherOne appendString:thirdString];