Question

在Android中，只要系统配置发生变化（如网络状态变化等），操作系统就会发送广播。广播接收者可以在我们的应用程序中接收这些广播消息，并相应地更改应用程序的行为，尽管我们的应用程序未处于运行状态。我如何在iOS中实现类似的广播接收器行为？

Answer 1

您可以使用NSNotificationCenter来监控更改。

NSNotificationCenter.defaultCenter().addObserver(
    self,
    selector: "batteryLevelChanged:",
    name: NSUserDefaultsDidChangeNotification,
    object: nil)

以下是API参考： https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSNotificationCenter_Class/

编辑1：

对于您的情况，您可以按照步骤进行尝试。

使用库Reachability获取有关更改的通知网络并定义自定义通知功能。

func reachabilityChanged(note: NSNotification) {

  let reachability = note.object as! Reachability

  if reachability.isReachable() {
    if reachability.isReachableViaWiFi() {
      print("Reachable via WiFi")
    } else {
      print("Reachable via Cellular")
    }
  } else {
    print("Network not reachable")
  }
}

在通知功能中，创建相应的本地通知

var notification = UILocalNotification()
notification.alertBody = "Notification message!!!" // text that will be displayed in the notification
notification.alertAction = "open" // text that is displayed after "slide to..." on the lock screen - defaults to "slide to view"
notification.fireDate = NSDate() // todo item due date (when notification will be fired)
notification.soundName = UILocalNotificationDefaultSoundName // play default sound
notification.userInfo = ["UUID": UUID, ] // assign a unique identifier to the notification so that we can retrieve it later
notification.category = "CATEGORY"
UIApplication.sharedApplication().scheduleLocalNotification(notification)

Answer 2

您已使用可达性类来实施网络更改通知，例如：

https://developer.apple.com/library/ios/samplecode/Reachability/Listings/Reachability_Reachability_h.html

如何在iOS运行状态下更改网络时获取通知

2 个答案: