There are conflicts over tableView's reload in FolderViewController

[guangmingzizai]

tableView.reloadData in folder.didSet conflicts with tableView.deleteRows or tableView.insertRows, so the app will crash on creating or deleting folders.

Two solutions:

• Only one update strategy. Delete tableView.deleteRows and tableView.insertRows, or call tableView.reloadData() imperatively instead of auto call in folder.didSet.
• Add a condition to tableView.reloadData() in folder.didSet. For example, add a updatingInteractive instance variable, set to true on start of deleteItem(item:) and insert(item:) methods, set to false on end.

Project: Recordings-controller-owned-networking*