问题
The app I'm working on is used on an iPad in a retail display. The device has auto-lock turned off, and the app will show a video loop as a type of screensaver after a minute of inactivity. We are using the GA iOS SDK 2.0 beta to track sessions, with a session timeout of 60 seconds. The app starts a session on startup, and also when the screensaver is dismissed by a touch. This is all working fine except for the multiple 0-10 second long sessions we get, with average duration of 0:00. We can start the app, go through a couple of 60 sec. sessions, then get those sessions reported along with 2-3 of the 0-10 sec. sessions. From what I can see the app only starts sessions when it is supposed to, so I'm wondering if this is related to how Google calculates a session. I haven't seen anything in the documentation that explains this and I'm stumped.
回答1:
Just found this answer from my friend
http://support.google.com/analytics/bin/answer.py?hl=en&answer=1144430&topic=1011345&ctx=topic
In my app I only have one view controller that uses [tracker trackView:@"my screen name"] and I have this stuck this in the AppDelegate.m for now as I hadn't got around to tracking views/screens yet. According to the linked material, the way GA calculates session duration is based on time between views. Since I only have one view defined (and not properly within the viewController), this may be the reason I'm getting so many 0-10sec sessions. Going to explore.
回答2:
It might possible you are initiating a new session before tracking a event/pageview. Please Ensure that you are not starting new session everytime. Refer this link https://developers.google.com/analytics/devguides/collection/ios/v3/sessions
来源：https://stackoverflow.com/questions/13766486/google-analytics-ios-sdk-v2-0-short-session-durations