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

我的应用程序不断解析一个 XML 文件(每 10 秒),我希望应用程序继续运行,以便在我的程序中满足某些条件时向用户发送本地通知,即使用户已最小化应用程序或锁定他们电话。

我已经从教程中反弹,每个人似乎都在“安排”通知,但这对我不起作用,因为我的通知不是基于时间的,而是基于满足的条件。

到目前为止我所做的:

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)
}

应用程序打开时警报效果很好,但是当我最小化手机上的应用程序时,通知永远不会出现。我假设应用程序在后台运行时没有运行,或者我不太理解这个概念。任何帮助是极大的赞赏。

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1 回答 1

13

默认情况下 NSTimer 只在模拟器中工作。尝试将此添加到您的 AppDelegate 文件中:

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
    }
于 2016-01-27T05:57:35.547 回答