Differences between strong and weak in Objective-C

Question

I\'m new to Obj-C, so my first question is:

What are the differences between strong and weak in @property declarations of poin

Answer 1

strong is the default. An object remains “alive” as long as there is a strong pointer to it.

weak specifies a reference that does not keep the referenced object alive. A weak reference is set to nil when there are no strong references to the object.