静态指针是强指针吗? [英] Is static pointer a strong pointer?

问题描述

在objective-c中，我知道一个静态变量(应该吗?)在程序的生命周期内保留其值.但是，如果它存储了一个指针，它在ARC中是否算作 strong ?我可以依靠它，并确保一旦将实例分配给静态变量，该实例就不会从不退出?

In objective-c, I know that a static variable (should?) retain its value for the lifetime of the program. But if it stores a pointer, does it count as strong in ARC? Can I depend on it and be assured that that instance will never go out of the heap once I assigned it to a static variable?

static ClassA* shared;

-(id)init
{
   if (self=[super init]) {
       shared=self;
   }
   return self;
}

推荐答案

是的，一旦分配，您就可以依靠它.

Yes you can rely on it, once it's assigned.

过渡到ARC发行说明状态:

在ARC中，对象类型的默认设置为强.

Under ARC, strong is the default for object types.

然后:

__ strong是默认设置.只要有强大的指针可以指向该对象，就保持其活动"状态.

__strong is the default. An object remains "alive" as long as there is a strong pointer to it.

鉴于您的static指针引用了该对象，它将保持活动"状态.指针的范围(无论是全局指针，堆栈上的指针还是实例变量)都没有区别.

Given your static pointer references the object, it will remain "alive". The scope of a pointer (whether global, a pointer on the stack or an instance variable) makes no difference.

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