How to call a selector in a different class

Question

How would this code be different if the method was in a different class?

[saveButton addTarget:self action:@selector(saveArray) forControlEvents:UIControlEventTouchUpInside];

Answer 1

Pass the object (which responds to the method) as the target parameter.

[saveButton addTarget:targetObj action:@selector(saveArray) forControlEvents:UIControlEventTouchUpInside];