Objective-C初始化（静态方法）调用了更多一次？ [英] Objective-C initialize (static method) called more that once?

问题描述

  SubclassOfNSObject * GlobalVariableThatShouldNeverChange; 
 
 @implementation MyClass 
 
 +（void）初始化
 {
 [super initialize]; 
 GlobalVariableThatShouldNeverChange = [[SubclassOfNSObject alloc] init]; 
 //使用GlobalVariableThatShouldNeverChange 
} 
 
 @end 
  

$ b更改更多内容$ b

我在整个代码中引用了这个参数，指向它的指针永远不会改变，因为我在代码中使用它。
问题是，当我使用 GHUnit 运行测试时，我遇到了 GlobalVariableThatShouldNeverChange 的指针被改变（即它正在重新初始化，我通过autorelease池发布的变量有问题，并且已修复，我对此问题有一个解决方法，但我想知道 为什么 ？

谢谢！

解决方案

文档说：b
$ b

运行时发送初始化给程序中的每个类，恰好在该类之前，或者从该类继承的任何类它。

推荐的方法是：

  +（void）初始化
 {
 if（self == [GHUnit class]）{
 
 / * pu t初始化代码* / 
 
} 
} 
  

另外请注意文档中的以下建议：

…你通常不应该在你的实现中发送 initialize 到 super 。

I have code similar to this in Objective-C:

SubclassOfNSObject *GlobalVariableThatShouldNeverChange;

@implementation MyClass

+(void) initialize
{
    [super initialize];
    GlobalVariableThatShouldNeverChange = [[SubclassOfNSObject alloc] init];
    // Change more stuff with GlobalVariableThatShouldNeverChange
}

@end

I have this referenced throughout code, and the pointer to this should never change because I am using it everywhere through my code. The problem is, that when I run my tests using GHUnit, I have odd problems with the GlobalVariableThatShouldNeverChange's pointer being changed (i.e. It is being reinitialized. I had a problem with the variable being released via the autorelease pool and that is fixed, and I have a workaround for this problem, but I would like to know why?

Thank you!

解决方案

The docs say:

The runtime sends initialize to each class in a program exactly one time just before the class, or any class that inherits from it.

The recommended approach is:

+ (void)initialize
{
    if (self == [GHUnit class]) {

        /* put initialization code here */

    }
}

Also note the following recommendation from the documentation:

… you should typically not send initialize to super in your implementation.

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