Measure the acceleration not the angle

Question

I want to measure the acceleration of the iPhone in the direction of the z-axis. However, the code I use measures the inclination, so the angle in which the device is located. But I want to measure the acceleration when the iPhone for example is lifted. Like some seismograph apps.

My code:

-(void)viewDidLoad
 {
    [super viewDidLoad];
    
    myMotionManager = [[CMMotionManager alloc] init];
    myMotionManager.accelerometerUpdateInterval = 0.1;
    
    if ([myMotionManager isAccelerometerAvailable])
    {
        NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        
        [myMotionManager startAccelerometerUpdatesToQueue:queue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
                
                Label.text = [NSString stringWithFormat:@"%.2f",accelerometerData.acceleration.z];
             
            });
        }];
        
    } else 
        NSLog(@"not active");

    [super viewDidLoad];
}

Answer 1

Okay, i found the answer. I have to use userAcceleration