使用iOS 7获取后台步骤

- (void)countSteps {
    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:1.0 / KUPDATEFREQUENCY];
    [[UIAccelerometer sharedAccelerometer] setDelegate:self];

    px = py = pz = 0;
    numSteps = 0;

    self.labelSteps.text = [Nsstring stringWithFormat:@"%d",numSteps];
}

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIacceleration *)acceleration {
    float xx = acceleration.x;
    float yy = acceleration.y;
    float zz = acceleration.z;

    float dot = (px * xx) + (py * yy) + (pz * zz);
    float a = ABS(sqrt(px * px + py * py + pz * pz));
    float b = ABS(sqrt(xx * xx + yy * yy + zz * zz));

    dot /= (a * b);

    if (dot <= 0.82) {
        if (!isSleeping) {
            isSleeping = YES;
            [self performSelector:@selector(wakeUp) withObject:nil afterDelay:0.3];
            numSteps += 1;
            self.labelSteps.text = [Nsstring stringWithFormat:@"%d",numSteps];
        }
    }
    px = xx;
    py = yy;
    pz = zz;
}

- (void)wakeUp {
    isSleeping = NO;
}

当显示器关闭时,您无法访问加速度计,但即使显示屏关闭,您也可以监控位置更改,无论iPhone型号如何.根据我的猜测,Moves应用程序使用基于地理位置的更改来计算步数.在CLLocationmanger文档中,我读到了这个

In iOS 6 and later,you can defer the delivery of location data when
your app is in the background. It is recommended that you use this
feature in situations where your app Could process the data later
without any problems. For example,an app that tracks the user’s
location on a hiking trail Could defer updates until the user hikes a
certain distance and then process the points all at once. Deferring
updates helps save power by allowing your app to remain asleep for
longer periods of time.

- (void)allowDeferredLocationUpdatesUntilTraveled:(CLLocationdistance)distance timeout:(NSTimeInterval)timeout

If your app is in the background and the system is able to optimize
its power usage,the location manager tells the GPS hardware to store
new locations internally until the specified distance or timeout
conditions are met. When one or both criteria are met,the location
manager ends deferred locations by calling the
locationManager:didFinishDeferredUpdatesWithError: method of its
delegate and delivers the cached locations to the
locationManager:didUpdateLocations: method. If your app is in the
foreground,the location manager does not defer the deliver of events
but does monitor for the specified criteria. If your app moves to the
background before the criteria are met,the location manager may begin
deferring the delivery of events.

因此,当您获得一组缓存位置时,您可以计算出发生的大致步骤数.我只是给你所有狂野的想法,由你决定！

看到这一点,似乎很有趣
https://www.cocoacontrols.com/controls/somotiondetector