MVC 模式下setName的时候更新有误

[tekizhong]

FolderViewController.swift 中
if let changeReason = userInfo[Item.changeReasonKey] as? String {
let oldValue = userInfo[Item.newValueKey]
let newValue = userInfo[Item.oldValueKey]
应改为：
if let changeReason = userInfo[Item.changeReasonKey] as? String {
let oldValue = userInfo[Item.newValueKey]
let newValue = userInfo[Item.oldValueKey]