Recently I face a problem which is rare to appear What I try to do is to get the number of steps per minute.
In my code:
let date = NSDate()
for i in 0...1000 {
dispatch_async(mySerialQueue) {
self.pedoMeter.queryPedometerDataFromDate(date.dateByAddingTimeInterval( Double(i+1) * -60.0 ), toDate: date.dateByAddingTimeInterval( Double(i) * -60.0 ), withHandler: { (data, error) in
if let data = data {
print("\(data.numberOfSteps)")
}
})
}
}
Sometimes, the number of steps would return a big number which can be >1000000. After tracing the device log, I found that there is a error log:
Sep 15 16:42:59 locationd[6315] <Error>: Steps were found to be non monotonically increasing - start:488825.000000, end:488825.000000
and that is the weird step number.
I am trying to avoid the problem. That's why I am using a serial queue to do the query. However, I failed. Is there any way to avoid it?
noice