If you've got a button that's hooked up to an action in your code, you can change the title without an instance variable.
For example, if the button is set to this action:
-(IBAction)startSomething:(id)sender;
You can simply do this in the method:
-(IBAction)startSomething:(id)sender {
[sender setTitle:@"Hello" forState:UIControlStateNormal];
}
Or if you're wanting to toggle the name of the button, you can create a BOOL named "buttonToggled" (for example), and toggle the name this way:
-(IBAction)toggleButton:(id)sender {
if (!buttonToggled) {
[sender setTitle:@"Something" forState:UIControlStateNormal];
buttonToggled = YES;
}
else {
[sender setTitle:@"Different" forState:UIControlStateNormal];
buttonToggled = NO;
}
}