title: Data flows in after app opening with iOS/Obj-c
body: <p>I started working on an existing app and noticed that the time "fast-forwards" when the app has been in the background for a long time. I shut it down at (example) 09:30 minutes, when I open it at 14:21 it did all of the work but only <em>then</em> it starts updating the UI. In a few seconds, it races through all of the data from five minutes in background.</p>
  
  <p>This is not acceptable behavior for my app, so this is what I have done:</p>
  
  <ul>
  <li>Added background mode (location) to my capabilities</li>
  <li><p>Of course I linked CoreMotion to use the gyro/accelerometer.</p>
  
  <pre><code>self.motionManager = [[CMMotionManager alloc] init];
  
  //Gyroscope
  if([self.motionManager isGyroAvailable])
  {
      // Start the gyroscope if it is not active already
      if([self.motionManager isGyroActive] == NO)
      {
          // Update us 2 times a second
          // [self.motionManager setGyroUpdateInterval:1.0f / 1.0f];
  
          [_motionManager setAccelerometerUpdateInterval:0.1];
          [self.motionManager
           startAccelerometerUpdatesToQueue:[NSOperationQueue mainQueue]
           withHandler:^(CMAccelerometerData  *accelerometerData, NSError *error) {
               if(error){
  
                   NSLog(@"%@", error);
               }
               else {
                   //NSString *x = [[NSString alloc] initWithFormat:@"%.02f",accelerometerData.acceleration.x];
  
                   float g = 9.80665f;
                   float AccelX = accelerometerData.acceleration.x * g;
                   float Accely = accelerometerData.acceleration.y * g;
                   float Accelz = accelerometerData.acceleration.z * g;
  
                   [self getSicknessIndicator:AccelX ay:Accely az:Accelz];
               }
           }];
  
          //Receive the gyroscope data on this block
  
  
      }
  }
  </code></pre></li>
  </ul>
  
  <p>I'm not quite sure why this behavior happens and I also tried out a lot of other questions on StackOverflow but with no result, unfortunately. They mostly tell me to add the background mode.</p>