在 iOS 上的应用处于后台时发送 Google Analytics 事件

Question

当您在 iOS 应用程序移至后台时发送事件时，谷歌分析的行为是什么。这些事件是否会影响服务？我们是否必须专门调用 [[GAI sharedInstance] dispatch];在那些情况下？

Answer 1

首先，您绝对可以按照您的建议进行操作：

[[GAI sharedInstance] dispatch];

Google Analytics 后台有第二个 dispatch here，基本上给你这个方法：

// This method sends any queued hits when the app enters the background.
- (void)sendHitsInBackground {
  __block BOOL taskExpired = NO;

  __block UIBackgroundTaskIdentifier taskId =
  [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
    taskExpired = YES;
  }];

  if (taskId == UIBackgroundTaskInvalid) {
    return;
  }

  __weak AppDelegate *weakSelf = self;
  self.dispatchHandler = ^(GAIDispatchResult result) {
    // Send hits until no hits are left, a dispatch error occurs, or
    // the background task expires.
    if (result == kGAIDispatchGood && !taskExpired) {
      [[GAI sharedInstance] dispatchWithCompletionHandler:weakSelf.dispatchHandler];
    } else {
      [[UIApplication sharedApplication] endBackgroundTask:taskId];
    }
  };

  [[GAI sharedInstance] dispatchWithCompletionHandler:self.dispatchHandler];
}

覆盖 applicationDidEnterBackground，像这样：

- (void)applicationDidEnterBackground:(UIApplication *)application {
  [self sendHitsInBackground];
}

并覆盖 applicationWillEnterForeground，如下所示：

- (void)applicationWillEnterForeground:(UIApplication *)application {
  // Restores the dispatch interval because dispatchWithCompletionHandler
  // has disabled automatic dispatching.
  [GAI sharedInstance].dispatchInterval = 120;
}