How to Concatenate String in Objective-C (iPhone)? [duplicate]

Try this:

NSMutableString* theString = [NSMutableString string];for (int i=0; i<=10;i++){    [theString appendString:[NSString stringWithFormat:@"%i ",i]];}label.text = theString;

Since you're using a loop, do be somewhat careful with both Tom and Benjie's solutions. They each create an extra autoreleased object per iteration. For a small loop, that's fine, but if the size of the loop is unbounded or if the strings are large, this can lead to a very large memory spike and performance hit. Particularly on iPhone, this is exactly the kind of loop that can lead to surprising memory problems due to short-lived memory spikes.

The following solution has a smaller memory footprint (it's also slightly faster and takes less typing). Note the call to -appendFormat: rather than -appendString. This avoids creating a second string that will be thrown away. Remember that the final string has an extra space at the end that you may want to get rid of. You can fix that by either treating the first or last iteration differently, or by trimming the last space after the loop.

NSMutableString* theString = [NSMutableString string];for (int i=0; i<=10;i++){    [theString appendFormat:@"%i ",i];}label.text = theString;

Don't forget [NSArray componentsJoinedByString:]. In this case you don't have an NSArray, but in the common cases where you do, this is probably the best way to get what you're looking for.

//NSArray *chunks   string = [chunks componentsJoinedByString: @","];