August 19, 2015 09:54:45

Object pointer: 1, the object pointer completes the specific function by manipulating the memory it points to

-When the object pointer points to nil, this object is called an empty object

-nil is the default value for the object pointer

-null object without any function or effect

2, gets the memory address that the object pointer points to

-Get through alloc or convenience builder

-Get through the method

* Local Object pointer

-Scope is bounded by curly braces

-{

ID obj;

}

* Global Object pointers

-member variables that are declared manually

-member variables for attribute declarations

* Local Object pointer

-Normal use (default)

-Temporary variables

* Global Object pointers

-Recommended use of all properties

-One object is part of another object

-common data that the entire object needs to use

-External Data Interface for objects

* Strong reference (default)

-pointer to an object with __strong or no identity

-Memory is not freed when used by this type of object pointer

* Return to zero weak references

-pointer to an object identified by __weak

-When memory is used by this type of object pointer, it may be released at any time

-the object pointer using this memory is set to nil after the memory is released

* Weak references

-pointer to an object identified by __unsafe__unretain

-Memory is released at any time and the object pointer is not set to nil

* Automatic release of the pool (can adjust the automatic release time)

[Email protected] {

Ikeuchi

}

is essentially a piece of code area, bounded by curly braces

* Auto-Release type Object

-pointer to an object identified by __autoreleasing

-The memory that is used or used by the object pointer is freed from the auto-free pool, regardless of whether the object pointer exists.

-by cooperating with the auto-release pool and delaying or releasing memory early

* Memory Management Specification

* General Conditions

-Except for special circumstances, it is the general situation

-Use strong type

* Special Type

-Cross Reference//strong reference loops

-reference chain closed loop//strong reference loop

-Returns the amount of memory address created by method

-Create a large number of objects within a loop through methods

———————— when the object is released, go to the Dealloc method

Convenience Builder

+ (Instancetype) student

{

__autoreleasing Student *s = [[Student alloc]init];

return s;

If you return a piece of memory through a method, the memory must be an object that has been used by autoreleasing

Basic data type bool type, int type, double type, with assign

August 19, 2015 09:54:45