c# - Xamarin.iOS 在应用未关闭时处理推送通知

Question

如果应用程序在后台使用方法 didReceiveRemoteNotification，我设法处理推送通知。如果应用程序在前台且未关闭，有没有办法处理推送通知？谢谢

Answer 1

你实现了吗UserNotification ？如果您在 iOS 10+ 上部署项目，您可以尝试在 FinishedLaunching(UIApplication application, NSDictionary launchOptions) 中订阅通知，例如:

if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
{
    var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
    UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) => {
        Console.WriteLine(granted);
    });
    UNUserNotificationCenter.Current.Delegate = new MyNotificationCenterDelegate();
}

然后当通知到来且应用程序在前台时，WillPresentNotification() 将触发，此处理事件返回通知到来时此应用程序将响应的操作。最后你可以在 DidReceiveNotificationResponse() 事件中获取 userInfo:

public class MyNotificationCenterDelegate : UNUserNotificationCenterDelegate
{
    public override void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
    {
        completionHandler();
    }

    public override void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
    {
        completionHandler(UNNotificationPresentationOptions.Sound | UNNotificationPresentationOptions.Alert);

    }       
}

但是，如果您不想实现 UserNotification，或者您只是使用键 content-available true 推送静默远程通知，则 didReceiveRemoteNotification() 即使应用程序在前台也会被触发。