In what cases and when does automatic memory release occur in the system?

In iOS, automatic memory management is performed through the ARC (Automatic Reference Counting) mechanism. ARC automatically tracks the reference count of an object and frees memory when there are no more strong references to the object.

When memory is freed:

• When the reference count of an object drops to zero, the object is destroyed and memory is released.
• This happens automatically when exiting the scope of a variable or when assigning nil to a reference.

It is important to avoid retain cycles, as they prevent objects from being released, leading to memory leaks.