如何在iPhone中获得加速时间和加速幅度

Question

Currently I'm trying to use CMAcceleration to get accelerometer values for x,y& z axis is it possible to get Acceleration Time & Acceleration Magnitude with this x,y & z values.When i checked the developer forum i can't find any delegates / methods to get this two.Guide me to find the values. Using the following code:

    int updatesensorFrequencyInterval = [sensorFrequencySliderTxt.text intValue];
self.motionManager.accelerometerUpdateInterval = updatesensorFrequencyInterval;
self.motionManager.gyroUpdateInterval = updatesensorFrequencyInterval;
[self.motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue]
                                         withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
                                             [self outputAccelertionData:accelerometerData.acceleration];
                                             if(error){
                                                 NSLog(@"%@", error);
                                             }
                                         }];

Answer 1

The x,y,z values of CMAccelerometerData acceleration struct are magnitudes in m/s^2.

CMAccelerometerData is a subclass of CMLogItem , so it inherits the timestamp property which provides the NSTimeInterval since the phone was booted. This can be used to measure elapsed time between any pair of samples.