OC Basic notes-memory management (Guangzhou Black Horse first phase)

Stacks: Local variables: Variables defined inside a method or function
System Management
Heap: Dynamic Storage Area
Generally by the program ape Management

# # Reference count

If memory management is inappropriate
1, no longer use objects are not recycled, memory leaks, resulting in program flash
2, is being used object is released, wild pointer, access to the wild pointer will cause the program to crash


ARC Automatic Reference Counting Auto Reference count
MRC Manual Reference Counting Manual reference count

1. When an object is just born, its reference count is 1
2, when the reference count on the object is 0, the system immediately recycles it

3. Release reference count-1
4, retain reference count +1

# # Memory Management for multiple objects

OC Basic notes-memory management (Guangzhou Black Horse first phase)