Question

I create an array with string names as shown below

NSMutableArray *strings = [[NSMutableArray alloc]init];
[string addObject:@"string1"];
[string addObject:@"string2"];
[string addObject:@"string3"];
[string addObject:@"string4"];

and I create a button. Whenever I click the button the strings are exchanged how can I do this?

Answer 1

EDIT:

Looks like you do not really lack basic knowledge. You can call this method in NSArray after you add your objects:

This method is the simplest way to do your job:

NSArray *sortedStrings = [strings sortedArrayUsingSelector:@selector(compare:)];

More about sortedArrayUsingSelector: