IOS 远程通知在 IOS 8 的后台不起作用

Posted 2023-02-23

【中文标题】IOS 远程通知在 IOS 8 的后台不起作用

【英文标题】：IOS remote notifications not working in background for IOS 8

【发布时间】：2015-03-10 15:30:56

【问题描述】：

我一直在使用 Xamarin.ios，最近遇到了当 Iphone/Ipad 处于后台时尝试接收远程通知负载的问题。 IOS 7 设备似乎在后台或前台工作。但是，对于 IOS 8 设备，只有在触摸警报横幅时才会调用 DidReceiveRemoteNotification。当未触摸警报横幅并且应用程序处于后台时，我需要能够获取有效负载。为什么 IOS 7 的远程通知在后台工作，而 IOS 8 却不能。我做错了什么？

if (UIDevice.CurrentDevice.SystemVersion [0] >= '8')
    
        UIUserNotificationType types = UIUserNotificationType.Badge | UIUserNotificationType.Sound | UIUserNotificationType.Alert;
        UIUserNotificationSettings settings = UIUserNotificationSettings.GetSettingsForTypes (types, null);
        UIApplication.SharedApplication.RegisterUserNotificationSettings (settings);
    
    else
    
        UIRemoteNotificationType notificationTypes = UIRemoteNotificationType.Alert | UIRemoteNotificationType.Badge |                                                      
        UIRemoteNotificationType.Sound;
        UIApplication.SharedApplication.RegisterForRemoteNotificationTypes (notificationTypes);
     

【参考方案1】：

如果版本是 iOS 8 或更高版本，您需要调用 RegisterForRemoteNotifications 方法，如下所示：

if (UIDevice.CurrentDevice.SystemVersion [0] >= '8')

    UIUserNotificationType types = UIUserNotificationType.Badge | UIUserNotificationType.Sound | UIUserNotificationType.Alert;
    UIUserNotificationSettings settings = UIUserNotificationSettings.GetSettingsForTypes (types, null);
    UIApplication.SharedApplication.RegisterUserNotificationSettings (settings);
    UIApplication.SharedApplication.RegisterForRemoteNotifications();