在 Objective-c 中，如果不再有指针指向 autoReleased 对象，它们会被释放吗？
只是出于好奇...如果我更改指针以指向其他自动释放实例，则指针指向的前一个自动释放实例是否会正常自动释放？例如...
NSString pStr* = [NSString stringWithString:@"instance One"];
// do sth with pStr
pStr = [NSString stringWithString:@"Instance two"];
// do sth else with pStr
两个实例都是自动释放的吗？
Just from Curiosity... If I alter a pointer to point to an other autoreleased instance, the previous autoreleased instance that the pointer was pointing to, is autoreleased normally ? For example ...
NSString pStr* = [NSString stringWithString:@"instance One"];
// do sth with pStr
pStr = [NSString stringWithString:@"Instance two"];
// do sth else with pStr
Are Both of the instances autoreleased ??
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是的。对象的生命周期并不真正取决于哪些变量指向它们（与垃圾收集的环境不同）。这就是为什么变量可能指向已释放的对象或内存泄漏：对象永远保留而没有对它们的引用。
生命周期取决于对象的创建方式以及如何使用
retain、release和autorelease方法。Cocoa 内存管理指南中有更详细的解释。
Yes. Lifecycle of objects doesn't really depend on which variables point to them (unlike environments with garbage-collection). That's why it's possible to have variable pointing to deallocated object or have memory leaks: objects retained forever with no references to them.
Lifecycle depends on how objects are created and how you use
retain,releaseandautoreleasemethods.It's explained in more details in Cocoa memory management guide.