Question

I’m an absolute beginner, and I need to have a button to invert two text fields:
text1 <—> text2

- (IBAction)swapText {
    name.text = surname.text;
    surname.text = name.text;
}

I know that I have to retain the values and then release them, but I’m not sure how to write it.

Answer 1

This is quite simple: the only text / NSString you have to retain is the one that will stop being hold by the UITextField itself, namely the name.text that you will replace by surname.text.

- (IBAction)swapText {
  NSString* temp = [name.text retain];
  name.text = surname.text;
  surname.text = temp;
  [temp release];
}