对于UIViewController，应该“释放”哪些方法并将其设置为“无”出口/实例变量？

Question

for a UIViewController which methods should a "release" and set to "nil" the outlets/instance variables?

That which of the methods out of "viewDidUnload" and "dealloc" should I be putting:

1. The "release" for outlets or other member variables in the class, and
2. The "xxx = nil" (ie set to nil) in

Answer 1

In viewDidUnload typical practice is to nil, using accessors, any objects embedded in the view controller's view - buttons, views, textfields, any descendant of UIView that could be in the view hierarchy:

self.myButton = nil;

In dealloc you should release ALL retained variables directly, including subviews:

[myButton release];
[someStateObject release];

Answer 2

I believe that in -dealloc , you should use the ivars directly; in other cases as like -viewDidUnload , you'll want to nil the properties.