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1.ARC When you call the release or retain statement yourself, ARC compiles the file when it is valid, and you can support both arc and non-arc code in the mashup through the-fno-objc-arc and-FOBJC-ARC two compiler flags

a is assigned to B. If a no longer uses this memory, it only needs to subtract the reference count by 1, indicating that it no longer owns the memory. b The reference count is also reduced by 1 when the memory is no longer used. When the reference count becomes 0, the memory is no longer referenced by any pointers, and the system can release it directly.Summary: The above two is actually the difference between assign and retain, assign is the direct assignment, which may cause 1 of the problem,

How to enable ARC in the cocos2d ProjectThe basic idea is not to support the separation of the ARC Code and the support of the ARC. You can set the compilation options in xcode to make the code that supports and does not support the ARC coexist. Cocos2d is the most popular 2d game engine in ios app development. However

Ios arc mechanism and iosarc Mechanism IOS ARC memory automatic management mechanism, currently, almost a lot of projects will use ARC, because it releases the memory to work, but although ARC is good, we still cannot leave memory management alone.How ARC works:

In the 2011 WWDC, Apple mentioned that 90% of the crash were caused by memory management, and ARC ( Automatic Reference Counting ) was the solution given by Apple. With ARC enabled, developers do not need to worry about memory management, and the compiler will handle it for you (note that arc is a compiler feature, not an iOS runtime feature, not a garbage collec

Author: fengsh998 Original address:http://blog.csdn.net/fengsh998/article/details/31824179 Reprint Please indicate the source Suppose that the article is helpful to you. Please support me by leaving a message or following the public account fengsh998 , thank you. Swift uses its own active reference count (ARC) to manage the memory usage of the application. This means that memory management is already part of Swift, and in most cases you do not need

1. arc does not automatically manage memory. Unlike autoreleasepool, arc is a feature provided by the llvm 3.0 compiler. The Compiler automatically inserts retain, release, and autorelease in appropriate places, so it is still manually managing the memory, objects are not stored in the memory for a long time like autoreleasepool. 2. arc can only work on objecti

1. Implementation principle:Wheel ProgressBar (rolling progress bar). In the native android progress bar, there is only an indeterminate scroll progress bar. Now we can implement a determinate progress bar to display the rolling progress bar of a specific progress, shows the effect: We will explain it in three steps:1. How to draw an arc accurately;2. How to accurately draw the progress text;3. How to dynamically simulate the progress process. The

Automatic Reference Counting (ARC) is a compile-time technology that simplifies the memory management of OBJECTIVE-C programming with this technique.Here I translate this technique into automatic memory counter management technology, which is the difference between OBJECTIVE-C code that uses and does not use this technique.Arc technology is released with XCode4.2, and in the default project template, you can specify whether your project supports

Hint: the "instance variable" in this article is "member variable", and "local variable" is "local variable" 0. Introductionarc is a new feature that has been added since iOS 5, eliminating the cumbersome manual management of memory, and the compiler automatically inserts the appropriate retain, release, and autorelease statements where appropriate. You no longer need to worry about memory management, because the compiler handles everything for youNote: ARC