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swift - 使用 Firebase,Swift removeObserver(withHandle 不会删除观察者

在Swift3中使用removeObserver(withHandle,不会在viewDidDisappear上删除观察者varquery=FIRDatabaseQuery()varpostRef:FIRDatabaseReference!varpostRefHandle:FIRDatabaseHandle?overridefuncviewDidLoad(){super.viewDidLoad()postRef=baseRef.child("Posts")}overridefuncviewDidDisappear(_animated:Bool){super.viewDidDisappe