在Objective-C中多次调用 [英] Calling -init multiple times in Objective-C

问题描述

当您在一个对象上调用多次时，会发生什么，是否有一些隐藏的副作用？
你能假设没有分配额外的内存吗？

What happens when you call -init multiple times on one object, are there some hidden side effects? Can you assume that no additional memory is allocated? Would anything go against such an idea?

推荐答案

调用 -init 多次未定义，不受支持，会导致错误，崩溃和其他意外行为。

Calling -init multiple times is undefined, unsupported, and will lead to bugs, crashes, and other unexpected behavior.

code> NSString ， NSArray 和 NSDictionary 当调用 + alloc 方法时，实际上不会分配任何 直到各种 -init * 方法之一被调用，对象有足够的上下文，以找出最有效的方式做任何你要求。

Many classes -- NSString, NSArray, and NSDictionary, for example -- don't actually allocate anything when the +alloc method is called. It isn't until one of the various -init* methods are called that the object has enough context to figure out the most efficient means of doing whatever you ask.

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