Whoops! beta5 has a new protocol for CMSensorRecorder...

I guess my earlier post noting that the batch based fetch could use an inclusive/exclusive flag is moot. Apple have removed that method call in beta5. Here are the sensor interfaces in beta5:

• public func accelerometerDataFromDate(fromDate: NSDate, toDate: NSDate) -> CMSensorDataList?
• public func recordAccelerometerForDuration(duration: NSTimeInterval)

Lovely. This means now, in addition to dealing with the 'up to 3 minutes' delay in retrieving data, we now need to keep NSDate fences for iterative queries. The documentation is a little ambiguous as to what data values should be used. I'll guess they are actual sample dates (document hints at 'wall time'). We'll see.

Anyway the beta5 upgrade is going ok, I'll port to a new style next (to also see if fromDate is inclusive or exclusive for returned samples). I'll also check to see if the CMSensorDataList needs to be extended to include generate().