应用程序在后台Swift 2.0中运行时发送本地通知 [英] Send Local Notifications while App is running in the background Swift 2.0

问题描述

当用户最小化应用程序时（通过单击iPhone的主页按钮或同时锁定手机），我试图向用户发送推送通知样式警报。

I am trying to send the user a 'Push Notification style' Alert when the user minimizes the app (by clicking on the iPhone's Home Button or by locking the phone as well).

我的应用程序不断解析XML文件（每10秒钟），我希望应用程序继续运行，以便在满足某些条件后向用户发送本地通知在我的程序中，即使在用户最小化应用程序或锁定他们的手机之后。

My app continuously parses an XML file (every 10 seconds) and I want the app to continue running so that it sends the user a Local Notification once some condition has been met in my program, even after the user has minimized the app or locked their phone.

我从教程中反弹并且每个人似乎都安排通知，但是这对我不起作用，因为我的通知不是基于时间的，而是基于满足条件。

I've bounced around from tutorials and everyone seems to 'schedule' a Notification, but this isn't going to work for me because my Notification isn't time-based, rather it's based off conditions being met.

到目前为止我做了什么：

What I've done so far:

AppDelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil))
    return true
}

MapViewController.swift

// Some function
func someFunction(delta: Int) {
    if delta < 100 {
        // Send alert to user if app is open
        let alertView = UIAlertController(title: "This is an Alert!", message: "", preferredStyle: UIAlertControllerStyle.Alert)
        alertView.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alertView, animated: true, completion: nil)

        // Send user a local notification if they have the app running in the bg
        pushTimer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("pushNotification"), userInfo: nil, repeats: false)
    }
}

// Send user a local notification if they have the app running in the bg
func pushNotification() {
    let notification = UILocalNotification()
    notification.alertAction = "Go back to App"
    notification.alertBody = "This is a Notification!"
    notification.fireDate = NSDate(timeIntervalSinceNow: 1)
    UIApplication.sharedApplication().scheduleLocalNotification(notification)
}

警报在应用程序打开时效果很好，但是当我最小化手机上的应用程序时，通知永远不会显示。我假设应用程序在后台运行时没有运行，或者我不太了解这个概念。非常感谢任何帮助。

The Alert works great while the app is open, but the notification never shows up when I minimize the app on my phone. I assume the app isn't running while it's in the background or I don't understand this concept that well. Any help is greatly appreciated.

推荐答案

默认情况下，NSTimer仅在模拟器中起作用。尝试将其添加到AppDelegate文件中：

By default NSTimer does work only in simulator. Try to add this to your AppDelegate file:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [.Sound, .Alert, .Badge], categories: nil))

application.beginBackgroundTaskWithName("showNotification", expirationHandler: nil)

        return true
    }

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