CMMotionActivityManager在CoreMotion框架下，用于获取用户当前所处的状态，如在自行车、车里或徒步行走等。

1、创建CMMotionActivityManager

var activityManager: CMMotionActivityManager = CMMotionActivityManager.init()

2、获取活动状态是否可用

let isAvailable = CMMotionActivityManager.isActivityAvailable()

3、开始获取活动状态

activityManager.startActivityUpdates(to: OperationQueue.current!) { motionActivity in
    if (motionActivity != nil) {
        if (motionActivity!.stationary) {
            print("静止")
        }
        else if (motionActivity!.walking) {
            print("步行")
        }
        else if (motionActivity!.running) {
            print("跑步")
        }
        else if (motionActivity!.automotive) {
            print("驾车")
        }
        else if (motionActivity!.cycling) {
            print("骑行")
        }
        else if (motionActivity!.unknown) {
            print("未知")
        }
    }
}

4、停止获取活动状态

activityManager.stopActivityUpdates()