OC Base Note--ARC

ARC Automatic Reference counting Auto Reference count

ARC Compiler Features
The compiler will add memory-managed code at the appropriate time

Strong pointer: All pointers by default are strong pointers
As long as there is a strong pointer pointing to an object, then this object will not be released
As long as there is no strong pointer pointing to an object, then this object is immediately recycled
__strong strong pointer, but the default all pointers are strong pointers, so he doesn't use
Weak pointers: Objects pointed to by weak pointers do not affect object recycling
Note: Do not use the weak pointer to point to a newly created object

When a circular reference occurs, it must be a weak pointer at one end

OC Base Note--ARC