iOS的计步实现

这篇文章是搬迁自我的新浪博客，因为无法自动搬迁所以就自己动手了
关于ios的计步是要区分版本的，iOS7以下，iOS7，iOS8和之上是要区分的。

关于iOS8和之上是采用​CMPedometer的，要先判断是否有计步器可用：

[CMPedometerisStepCountingAvailable]​
看代码

if (IOS8) {

        if ([CMPedometerisStepCountingAvailable]) { //判断系统的计步器是否可以使用(ios8)

            if (self.setpcount == nil) {

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

            }

   //计步的时候要开个线程   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

​ //开始持续更新

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

                    if (error != nil) {

                       return;

                    }

                    NSNumber *count = pedometerData.numberOfSteps;

                    myStep += [count integerValue]; //步数增加了

                     }];

            });

        }

    }

对于iOS7是采用CMStepCounter来计步的，:

 if ([CMStepCounter isStepCountingAvailable]) { //判断计步器是否可用(ios7)

            if (_setpcount == nil) {

                _stepCount = [[CMStepCounter alloc] init];

            }

//要开线程​

            NSOperationQueue *queue = [[NSOperationQueuealloc] init];

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

                myStep += numberOfSteps; //在这里步数增加了

            }];​

        }

对于iOS7以下是采用计步算法分析陀螺仪数据来统计步数的，

- (void)userCMMotionManagerCountStep {

    motionManager = [[CMMotionManageralloc] init];

    motionManager.showsDeviceMovementDisplay = YES;

    motionManager.deviceMotionUpdateInterval = 1.0 / 60.0;

    [motionManagerstartDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXTrueNorthZVertical];

    px = py = pz = 0;

    NSTimeInterval updateInterval = 0.05; // 每秒采样20次

    __block NSInteger stepCount = 0; // 步数



    if ([motionManagerisAccelerometerAvailable] == YES) {



        [motionManagersetAccelerometerUpdateInterval:updateInterval];



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

         { //以下是计步算法，分析得到的数据的，有更好的算法可用，可以替换这部分代码

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



    }

}


- (void)wakeUp {
    isSleeping = NO;
}