- (void)dealloc { weak typeof(self)weak_self = self; NSLog(@"%@", weak_self); }代码崩溃问题

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objc[4572]: Cannot form weak reference to instance (0x160f6f890) of class MFChatRoomBoardController. It is possible that this object was over-released, or is in the process of deallocation.(lldb) error: empty command(lldb) bt* thread #1: tid = 0x35914d, 0x0000000182307aac libobjc.A.dylib`_objc_trap(), queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x182307aac)  * frame #0: 0x0000000182307aac libobjc.A.dylib`_objc_trap()    frame #1: 0x0000000182307b24 libobjc.A.dylib`_objc_fatal(char const*, ...) + 88    frame #2: 0x0000000182319890 libobjc.A.dylib`weak_register_no_lock + 316    frame #3: 0x0000000182320688 libobjc.A.dylib`objc_initWeak + 224    frame #4: 0x000000010022bf8c MakeFriends`-[MFChatRoomBoardController dealloc](self=0x0000000160f6f890, _cmd="dealloc") + 36 at MFChatRoomBoardController.m:31
其中，可以在控制台明确看到这样一段描述:
objc[4572]: Cannot form weak reference to instance (0x160f6f890) of class MFChatRoomBoardController. It is possible that this object was over-released, or is in the process of deallocation.
说明不允许在 dealloc 的时候取 weak self.

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- (void)dealloc { __weak __typeof(self)weak_self = self; NSLog(@"%@", weak_self); }代码崩溃问题

- (void)dealloc { weak typeof(self)weak_self = self; NSLog(@"%@", weak_self); }代码崩溃问题