kvc error
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.
被关注的对象的生命周期不足！
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.
被关注的对象的生命周期不足！
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