Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'An instance 0x7fb3ddd0ba80 of class BtnViewController was deallocated while key value observers were still registered with it.

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被關注的對象的生命周期不足！

轉載于:https://www.cnblogs.com/code-Officer/p/6305445.html

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