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 and weak, these keywords revolves around Object Ownership in Objective-C

What is object ownership ?

Pointer variables imply ownership of the objects that they point to.

• When a method (or function) has a local variable that points to an object, that variable is said to own the object being pointed to.
• When an object has an instance variable that points to another object, the object with the pointer is said to own the object being pointed to.

Anytime a pointer variable points to an object, that object has an owner and will stay alive. This is known as a strong reference.

A variable can optionally not take ownership of an object that it points to. A variable that does not take ownership of an object is known as a weak reference.

Have a look for a detailed explanation here Demystifying @property and attributes