Oc_4 IOS Memory Management

Source: Internet
Author: User

The main content of Memory Management in IOS is to solve the crash problem !!!

Crash

In iOS, 100% of the reason for crash is memory problems.

1. Memory leakage (open up space, no recycling; keep opening up without releasing)

30 m (a program 3gs, 320x640) greater than 30 m (ios4, 640x960)

2. "Too careful" excessive release (the reason is the wild pointer)

3. Wild pointer

Garbage collection mechanism: a new Java object (no need to worry about memory, the system automatically recycles)

Mac OS has a garbage collection mechanism

IOS does not have a garbage collection mechanism

IOS is 32bit

Person: nsobject

{

Nsstring * _ name, * _ sex;

Int _ age;

}

Alloc is allocated with 12 bytes

Bool isused

Int retaincount

Dealloc force release

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