如何使本地通知操作直接删除 Swift 中的待办事项

Posted 2023-02-24

【中文标题】如何使本地通知操作直接删除 Swift 中的待办事项

【英文标题】：How to make local notification actions directly delete To-Do Items in Swift

【发布时间】：2016-02-11 23:32:01

【问题描述】：

我在 Swift 中有一个 Table View Controller 项目。 我需要 2 个本地通知操作：一个用于完成和删除截止日期的待办事项，另一个用于打开应用程序的视图控制器。 我已经为操作添加了NSNotificationCenter.defaultCenter().addObserver，但我仍然想知道如何从cellForRowAtIndexPath 中删除待办事项。仅使用通知操作。 我希望你能帮助我！提前谢谢！

以下是我的部分代码：

AppDelegate：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool 

    // Actions
    var firstAction:UIMutableUserNotificationAction = UIMutableUserNotificationAction()
    firstAction.identifier = "FIRST_ACTION"
    firstAction.title = "Complete" // "First Action"

    firstAction.activationMode = UIUserNotificationActivationMode.Background
    firstAction.destructive = true
    firstAction.authenticationRequired = false

    var secondAction:UIMutableUserNotificationAction = UIMutableUserNotificationAction()
    secondAction.identifier = "SECOND_ACTION"
    secondAction.title = "Edit" // "Second Action"

    secondAction.activationMode = UIUserNotificationActivationMode.Foreground
    secondAction.destructive = false
    secondAction.authenticationRequired = false

    var thirdAction:UIMutableUserNotificationAction = UIMutableUserNotificationAction()
    thirdAction.identifier = "THIRD_ACTION"
    thirdAction.title = "Third Action"

    thirdAction.activationMode = UIUserNotificationActivationMode.Background
    thirdAction.destructive = false
    thirdAction.authenticationRequired = false


    // category

    var firstCategory:UIMutableUserNotificationCategory = UIMutableUserNotificationCategory()
    firstCategory.identifier = "FIRST_CATEGORY"

    let defaultActions:NSArray = [firstAction, secondAction, thirdAction]
    let minimalActions:NSArray = [firstAction, secondAction]

    firstCategory.setActions(defaultActions as! [UIUserNotificationAction], forContext: UIUserNotificationActionContext.Default)
    firstCategory.setActions(minimalActions as! [UIUserNotificationAction], forContext: UIUserNotificationActionContext.Minimal)

    // NSSet of all our categories

    let categories:NSSet = NSSet(objects: firstCategory)



    let types:UIUserNotificationType = UIUserNotificationType(arrayLiteral: .Alert, .Badge)

    let mySettings:UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, categories: categories as! Set<UIUserNotificationCategory>)

    UIApplication.sharedApplication().registerUserNotificationSettings(mySettings)



func application(application: UIApplication!,
    handleActionWithIdentifier identifier:String!,
    forLocalNotification notification:UILocalNotification!,
    completionHandler: (() -> Void)!)


        if (identifier == "First_Action")


            NSNotificationCenter.defaultCenter().postNotificationName("actionOnePressed", object: nil)




        else  if (identifier == "Second_Action")

            NSNotificationCenter.defaultCenter().postNotificationName("actionTwoPressed", object: nil)


        


        completionHandler()

ToDoTableViewController：

// 
NSNotificationCenter.defaultCenter().addObserver(self, selector: "drawAShape", name: "actionOnePressed", object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "showAMessage", name: "actionTwoPressed", object: nil)

//
let newIndexPath = NSIndexPath(forRow: todoItems.count, inSection: 0)
todoItems.append(todoItem)
tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Bottom)         

//scheduleLocalNotification(todoItem)
let notification:UILocalNotification = UILocalNotification()
notification.category = "FIRST_CATEGORY"
notification.alertBody = "Notification \(todoItem.title)"
notification.fireDate = fixNotificationDate(todoItem.deadline)
notification.userInfo = ["note":todoItem.note, "title": todoItem.title]

         UIApplication.sharedApplication().scheduleLocalNotification(notification)

【参考方案1】：

目前你没有在application:handleActionWithIdentifier:forLocalNotification:completionHandler: 和函数之间传递任何东西来做某事。因此这些函数不知道该做什么。

您传递的identifier 需要提供足够的信息来确定要做什么。例如，删除记录 123 可能是“delete=123”。然后你可以在 postNotification 中传递这个：

     NSNotificationCenter.defaultCenter().postNotificationName("actionTwoPressed",
         object: nil, userInfo: identifier)

现在您想在actionTwoPressed 通知的处理程序中获取它，对您来说是showAMessage，所以它需要一个参数：

    func showAMessage(notification: NSNotification) 
        // notification.userInfo is the identifier
    

这也意味着你需要改变addObserver，包括“:”来显示一个参数被传递：

    NSNotificationCenter.defaultCenter().addObserver(self,
        selector: "showAMessage", name: "actionTwoPressed:", object: nil)

此外，这些代码都不会在cellForRowAtIndexPath 中。

【讨论】：

我已经做到了！但我不知道如何让func showAMessage() 删除indexPath 中的todoItems。我已经尝试过类似：todoItems.removeAtIndex(indexPath.row) 就像 commitEditingStyle 一样，但没有结果。