通常使用 weak 引用以避免在应用程序对象图中保留周期。 我理解这部分。 现在我想更进一步,了解它们是如何在引擎盖下工作的。
略微搜索时,我读过,当我使用
当我使用这个代码时:
id _weak myWeakObj = [[NSObject alloc] init];
编译者给我一个警告,我可以解决:
id _strong myStrongObj = [[NSObject alloc] init];
id _weak myWeakObj = myStrongObj;
因此,基于上一个问题, myStrongObj 所引用的对象会怎么样? 如果可能的话,我想知道编译器的代码长什么样?
以下是你的朋友:
以及目标C运行时间的来源:
特别要注意:
如果您在第一个链接下查看 objc_initWeak 和 >objc_destroyweak , 并会看到它是如何“在引擎盖下”操作的。 内脏在 weak_register_no_lock 中,用于登记薄弱的参考,在 weak_unregister_no_lock 中则用于解密薄弱的引用。
我将留给你来研究,看看它是如何运作的:-)。
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