Swift : Merge multiple readings on system time

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device.accelerometer?.sampleFrequency = 50;

device.accelerometer?.dataReadyEvent.startNotificationsAsync(handler: { (obj, error) in

   if let obj = obj {

   let myData = "\(obj.x)," + "\(obj.y)," + "\(obj.z)," + self.self.formatter.string(from: Date()) + ",\(self.totalAccelSample)";

   // do something with the data

   }

});

I am aware that I can do the same for reading the gyro data. However, I cannot figure out how to get both the accelerometer and gyro readings *at the same time*. I understand that the method I am calling above behaves in the way of "when you have data, send it to me". However, I'd rather "poll" for all data I am interested in at once, as opposed to "waiting" for it. Is it possible to poll the accelerometer and gyro data at will?