iOS的計步實現

這篇文章是搬遷自我的新浪博客，因爲無法自動搬遷所以就自己動手了
關於ios的計步是要區分版本的，iOS7以下，iOS7，iOS8和之上是要區分的。

關於iOS8和之上是採用​CMPedometer的，要先判斷是否有計步器可用：

[CMPedometerisStepCountingAvailable]​
看代碼

if (IOS8) {

        if ([CMPedometerisStepCountingAvailable]) { //判斷系統的計步器是否可以使用(ios8)

            if (self.setpcount == nil) {

                self.setpcount = [[CMPedometer alloc] init];

            }

   //計步的時候要開個線程   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

​ //開始持續更新

​ [self.setpcountstartPedometerUpdatesFromDate:[NSDatedate] withHandler:^(CMPedometerData *pedometerData, NSError *error) {

                    if (error != nil) {

                       return;

                    }

                    NSNumber *count = pedometerData.numberOfSteps;

                    myStep += [count integerValue]; //步數增加了

                     }];

            });

        }

    }

對於iOS7是採用CMStepCounter來計步的，:

 if ([CMStepCounter isStepCountingAvailable]) { //判斷計步器是否可用(ios7)

            if (_setpcount == nil) {

                _stepCount = [[CMStepCounter alloc] init];

            }

//要開線程​

            NSOperationQueue *queue = [[NSOperationQueuealloc] init];

            [_stepCountstartStepCountingUpdatesToQueue:queue updateOn:1withHandler:^(NSInteger numberOfSteps, NSDate * _Nonnull timestamp, NSError * _Nullable error) {

                myStep += numberOfSteps; //在這裏步數增加了

            }];​

        }

對於iOS7以下是採用計步算法分析陀螺儀數據來統計步數的，

- (void)userCMMotionManagerCountStep {

    motionManager = [[CMMotionManageralloc] init];

    motionManager.showsDeviceMovementDisplay = YES;

    motionManager.deviceMotionUpdateInterval = 1.0 / 60.0;

    [motionManagerstartDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXTrueNorthZVertical];

    px = py = pz = 0;

    NSTimeInterval updateInterval = 0.05; // 每秒採樣20次

    __block NSInteger stepCount = 0; // 步數



    if ([motionManagerisAccelerometerAvailable] == YES) {



        [motionManagersetAccelerometerUpdateInterval:updateInterval];



        [motionManagerstartAccelerometerUpdatesToQueue:[NSOperationQueuecurrentQueue] withHandler:^(CMAccelerometerData *accelerometerData, NSError *error)

         { //以下是計步算法，分析得到的數據的，有更好的算法可用，可以替換這部分代碼

             float xx = accelerometerData.acceleration.x;

             float yy = accelerometerData.acceleration.y;

             float zz = accelerometerData.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;

                       stepCount ++;

                     [NSTimerscheduledTimerWithTimeInterval:0.3target:selfselector:@selector(wakeUp) userInfo:nilrepeats:NO];



                 }

             }

             px = xx; py = yy; pz = zz;

        }];

    }else {

        [ErrorSignViewshowSignText:@"傳感器不可用"andOnParentView:[UIApplicationsharedApplication].keyWindow];



    }

}


- (void)wakeUp {
    isSleeping = NO;
}