Question

I believe I have to release an object if I created it with the keywords init, alloc, copy, or move I believe. I may create objects with code that don’t use this keywords so I guess I don’t have to release them right? so take for instance this code:

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Hello" forState:UIControlStateNormal];
button.frame = CGRectMake(40.0, 200.0, 170.0, 40.0);
[self.view addSubview:button];

since I did not use any of those keywords in my code I should not release it right? so when is that object being released? I am little confused with the memory managment stuff.

Answer 1

The only object you created here is the UIButton, and you used the buttonWithType class method. That is returning you autoreleased object, so you don’t have to release it.

Keep in mind though that if you were to need this button at a later time you would need to retain it and eventually release it. Because you add this button to a view, the view retains a copy in this case so again you don’t need to worry about it.