iOS Accelerometer Sensor (Accelerometer)

Introduction

The accelerometer detects changes in the device's position along the x, y, and z axes.

Using the accelerometer, you can determine the device's current position relative to the ground.

The following example code needs to be run on a real device; it will not work on a simulator.

Example Steps

1. Create a simple view application.
2. Add three labels in ViewController.xib and create ibOutlets for them: xlabel, ylabel, and zlabel.

3. Update ViewController.h as shown below:

   #import <UIKit/UIKit.h>
   
   @interface ViewController : UIViewController<UIAccelerometerDelegate>
   {
       IBOutlet UILabel *xlabel;
       IBOutlet UILabel *ylabel;
       IBOutlet UILabel *zlabel;
   }
   @end
   

4. Update ViewController.m as shown below:

   #import "ViewController.h"
   
   @interface ViewController ()
   
   @end
   
   @implementation ViewController
   
   - (void)viewDidLoad
   {
       [super viewDidLoad];
       [[UIAccelerometer sharedAccelerometer]setDelegate:self];
       // Do any additional setup after loading the view, typically from a nib
   }
   
   - (void)didReceiveMemoryWarning
   {
       [super didReceiveMemoryWarning];
       // Dispose of any resources that can be recreated.
   }
   - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:
     (UIAcceleration *)acceleration{
       [xlabel setText:[NSString stringWithFormat:@"%f", acceleration.x]];
       [ylabel setText:[NSString stringWithFormat:@"%f", acceleration.y]];
       [zlabel setText:[NSString stringWithFormat:@"%f", acceleration.z]];
   }
   
   @end
   

Output

When we run this application on an iPhone device, the output will be as shown below.