ios - Swift 中基于位置的通知

Question

我想创建一个基于位置的通知。像这样:

Create local location based notifications in swift

那么如果我使用UILocalNotification，我如何将alertBody设置为仅当用户进入特定区域时才执行的函数的结果？

基本上，当用户进入特定区域时，我想执行 GET 请求并获取一些数据，如果需要，这些数据将显示在通知中。

此外，当您注册地理位置时，您是否需要让 locationManager 一直运行，以便您获得 didLocationUpdate 调用？

Answer 1

您想使用 Core Location 并创建一个 CLCircularRegion。有关详细信息，请参阅 Xcode 帮助系统。

编辑:

具体来说，您要使用 CLLocationManager。查看 startMonitoringForRegion 方法。我建议在 Xcode 帮助系统中搜索“CLLocationManager 类引用”并阅读整个介绍部分，直至并包括“使用区域监视边界交叉点”部分，然后阅读 startMonitoringForRegion 和相关的类和方法。

以下是“使用区域监控边界交叉点”部分介绍部分的简短摘录:

To start region monitoring, configure the appropriate region objectand pass it to the startMonitoringForRegion: method of your locationmanager. In iOS, registered regions persist between launches of yourapp. If a region boundary crossing occurs while your iOS app is notrunning, the system automatically wakes it up (or relaunches it) inthe background so that it can process the event. In this case, theoptions dictionary passed to theapplication:didFinishLaunchingWithOptions: method of your app delegatecontains the key UIApplicationLaunchOptionsLocationKey to indicatethat your app was launched because of a location-related event. Duringthe relaunch process, you must recreate your location manager objectand assign a delegate capable of handling region-related events. Afteryou do that, the system delivers the region notification for whichyour app was launched. All of the regions you configured previouslyare made available in the monitoredRegions property of any locationmanager objects you create.

Once you set up the location manager to monitor a circular region, you will get called when the user enters or exits the region.You can then perform your network request and generate a localnotification if your app is not running in the foreground.

请注意，如果您在后台进行网络操作，您需要请求后台时间，否则您可能会在响应到来之前被暂停。