在Swift 2中安排特定时间的本地通知 | 2中安排特定时间的本地通知

本文介绍了在Swift 2中安排特定时间的本地通知的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我到过所有这些论坛和其他网站，并且得到的答案并没有累加.本质上，我想创建一个通知，例如在每个工作日上午6:28 AM，12:28 PM和5:28 PM触发.

I've been all over these forums and other sites and I keep getting pieces of an answer that don't add up. Essentially, I would like to create a notification that fires, for example, every weekday at 6:28 AM, 12:28 PM, and 5:28 PM.

我有一个解决方案，但是我真的不确定去哪里.我完全可以设置吗?感谢您的帮助.

I have pieces of a solution, but I'm really unsure where to go. Am I setting this up right at all? Any help is appreciated.

let notification: UILocalNotification = UILocalNotification()
notification.category = "News and Sports"
notification.alertAction = "get caught up with the world"
notification.alertBody = "LIVE news and sports on VIC in just a minute!"
UIApplication.sharedApplication().scheduleLocalNotification(notification)

推荐答案

准备显示本地通知需要两个主要步骤:

Preparing to show local notifications requires 2 main steps:

在iOS 8或更高版本上，您的应用必须询问并获得用户的权限才能显示本地通知.可以在您的AppDelegate中按以下步骤进行权限授予.

On iOS 8+ your app must ask and, subsequently, be granted permission by the user to display local notifications. Asking permission can be done as follows in your AppDelegate.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    ...
    if #available(iOS 8, *) {
        application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [.Sound, .Alert, .Badge], categories: nil))
    }

    return true
}

当您的应用程序在iOS 8之前的操作系统上运行时，请勿调用registerUserNotificationSettings(_:).否则，您的应用程序将在运行时崩溃.幸运的是，这不是问题，因为您使用的是Swift 2.

Do not call registerUserNotificationSettings(_:) when your app is running on a pre-iOS 8 operating system. Otherwise, your app will crash at runtime. Luckily, this shouldn't be a problem since you're working with Swift 2.

安排将来的通知fireDate.

let notification:UILocalNotification = UILocalNotification()
...
... // set the notification's category, alertAction, alertBody, etc.
...
notification.fireDate = ... // set to a future date
UIApplication.sharedApplication().scheduleLocalNotification(notification)

不幸的是，根据@aprogrmr的此堆栈溢出答案，

Unfortunately, according to this Stack Overflow answer by @progrmr,

您不能将这些枚举相乘并获得它们的倍数间隔.您最多只能在64个本地通知中设置您的应用.除非触发，否则您不能重新安排通知的时间，除非用户在通知触发时选择运行您的应用(他们可能会不运行它).

You cannot multiply those enumerations and get multiples of those intervals. You cannot have more than 64 local notifications set in your app. You cannot reschedule a notification once it fires unless the user chooses to run your app when the notification fires (they may not run it).

有重复间隔乘数的请求发布在此处. 您可以在其中添加评论.我建议提交错误报告或功能向苹果请求(url?).

There is a request for repeat interval multipliers posted here. You can add comments to it. I suggest filing a bug report or feature request (url?) with Apple.

许多其他Stack Overflow答案也证实了以上引文中的声明.访问指向完整引用的答案的链接，其中包含支持的答案的列表.

Many other Stack Overflow answers confirm the claims in the quotes above. Visit the link to the full quoted answer, which contains a list of supporting answers.

您的情况可能的解决方法是安排3条本地通知.将每一个分别设置为分别在6:28 AM，12:28 PM和5:28 PM开火.然后，将所有3个本地通知的repeatInterval设置为.CalendarUnitWeekday.

A potential workaround for your case would be to schedule 3 local notifications. Set each one to fire at 6:28 AM, 12:28 PM, and 5:28 PM, respectively. Then, set the repeatInterval of all 3 local notifications to .CalendarUnitWeekday.

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