Cocoa 中的单例和内存管理
我有一个单例作为类方法：
+(WordsModel *) defaultModel{
static WordsModel *model = nil;
if (!model) {
model = [[[self alloc] init] autorelease];
}
return model;
}
方法内对模型的静态引用会发生什么？它会被释放吗？
I have a singleton as class method:
+(WordsModel *) defaultModel{
static WordsModel *model = nil;
if (!model) {
model = [[[self alloc] init] autorelease];
}
return model;
}
What happens with the static reference to model inside the method? Will it ever get released?
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它不仅会被释放（因为您向它发送了
-autorelease消息），您下次尝试使用它可能会导致崩溃，因为model指针没有被释放。当对象被释放时设置为零。因此，它将指向垃圾内存，或者（如果该内存已被重新使用）指向与您预期不同的对象。Not only will it get released (because you sent it an
-autoreleasemessage), your next attempt to use it will probably lead to a crash because themodelpointer wasn't set to nil when the object was released. So, it will then point to memory that's either garbage, or (if that memory has been re-used) to a different object than the one you expected.当您自动释放类的实例时，它将不起作用...
在下一个运行循环中，它将被释放...
看看标准的单例模式：
http://www.cocoadev.com/index.pl?SingletonDesignPattern
静态实例应该是一个全局变量，当您的应用程序退出时它将被释放......
It won't work as you are autoreleasing your instance of your class...
On the next runloop, it will be released...
Take a look at the standard singleton patterns:
http://www.cocoadev.com/index.pl?SingletonDesignPattern
The static instance should be a global variable, that will be freed when your app exits...