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]
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]