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autorelease什么时候实际导致Cocoa Touch发布?

在Cocoa Touch中,autorelease是一种内存管理机制,它允许对象在一定时间后被释放。autorelease的实际导致Cocoa Touch发布的时间取决于具体的实现和使用场景。

通常,当一个对象被创建并分配给一个变量时,它的引用计数会增加。当变量超出作用域或被释放时,引用计数会减少。如果引用计数变为零,对象就会被释放。

在某些情况下,对象可能需要在一定时间后才能被释放。这时,可以使用autorelease机制。autorelease会将对象添加到一个自动释放池中,当自动释放池被释放时,它会释放其中的所有对象。

在Cocoa Touch中,通常有一个主自动释放池,它在应用程序的主循环中被使用。当一个对象被标记为autorelease时,它会被添加到当前的自动释放池中。当主自动释放池被释放时,它会释放其中的所有对象。

因此,autorelease什么时候实际导致Cocoa Touch发布取决于自动释放池何时被释放。在大多数情况下,这是在应用程序的主循环中完成的。但是,在某些情况下,可能需要创建额外的自动释放池,以便在特定的作用域中释放对象。

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