保留和复制的区别?

Difference between retain and copy?(保留和复制的区别?)

问题描述

保留和复制之间到底有什么区别?它对引用计数有什么意义?

What exactly is the difference between retain and copy? what is its significance on reference counting?

我知道当使用 alloc/retain 分配对象时，引用计数会增加一.那么如何使用副本?

I know that when an object is allocated using alloc/retain, reference count goes up by one. so how about using copy?

与此相关的另一个问题是，使用之间的区别
@property(nonatomic, retain) 和 @property(nonatomic,copy)?

Another question relating to this is, the difference between using
@property(nonatomic, retain) and @property(nonatomic,copy)?

推荐答案

retain -- 在创建的对象上完成，它只是增加引用计数.

retain -- is done on the created object, it just increase the reference count.

复制——创建一个新对象

copy -- create a new object

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