ios - 远程通知未按预期工作

Question

我正在尝试让我的远程通知正常工作，但我遇到了一些问题。

我正在从我的服务器发送通知，并将 content-available 标志设置为 1，这样我的 didReceiveRemoteNotification 就会被触发，我通过在 didReceiveRemoteNotification 中触发以下方法向用户显示通知:

- (void) showPush:(NSString *)message
{

  UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

  UNMutableNotificationContent *content = [UNMutableNotificationContent new];
  content.body = message;
  content.sound = [UNNotificationSound defaultSound];

  NSString *identifier = @"UYLLocalNotification";
  UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier
                                                                        content:content trigger:nil];

  [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
    if (error != nil) {
      NSLog(@"Something went wrong: %@",error);
    }
  }];
}

应用处于挂起状态时发送的通知根本不显示，而是在应用打开并再次关闭后显示，如下所示:

-> App is suspended: notification is sent
-> App is opened and in  the foreground: I can see that the notification has been processed
-> App is closed and in the background: notification is being displayed with a banner

对于为什么这不能按预期工作的任何建议，我们将不胜感激。

Answer 1

我认为您需要从一个略有不同的应用委托(delegate)回调中调用 showPush:

- (void)application:(UIApplication *)application 
didReceiveRemoteNotification:(NSDictionary *)userInfo 
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler;

此回调说明的文档:

Unlike the application(_:didReceiveRemoteNotification:) method, which is called only when your app is running in the foreground, the system calls this method when your app is running in the foreground or background.

参见:https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1623013-application?language=objc