Xamarin Forms iOS如何将应用程序带到前台-其他应用程序做到了

Question

I'm working on my Xamarin Forms app. It needs to bring itself to the foreground once its been backgrounded using location services (background mode) after a while. How can this be achieved?

I notice other apps do it in the app store.

Any help would be much appreciated! Thanks

Answer 1

You can use startMonitoringSignificantLocationChanges to achieve this.

In the apple document https://developer.apple.com/documentation/corelocation/cllocationmanager/1423531-startmonitoringsignificantlocati it writes:

If you start this service and your app is subsequently terminated, the system automatically relaunches the app into the background if a new event arrives. In such a case, the options dictionary passed to the application( :willFinishLaunchingWithOptions:) and application( :didFinishLaunchingWithOptions:) methods of your app delegate contains the key location to indicate that your app was launched because of a location event. Upon relaunch, you must still configure a location manager object and call this method to continue receiving location events. When you restart location services, the current event is delivered to your delegate immediately. In addition, the location property of your location manager object is populated with the most recent location object even before you start location services.

After relaunch, you can do something in FinishedLaunching in AppDelegate:

 public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
        {
            // Override point for customization after application launch.
            // If not required for your application you can safely delete this method

            if (launchOptions.ContainsKey(UIApplication.LaunchOptionsLocationKey))
            {
                // do something here after the app awaked
            }

            return true;
        }