How to get accelerometer data in IOS?

Question

I am using the UIAccelerotmeterDelegate method accelerometer:didAccelerate: but recently that method has been deprecated in iOS 5.0. So what is the alternative way

Answer 1

I am answering this for Swift 5.x.

@available(iOS, introduced: 2.0, deprecated: 13.0, message: "UIAcceleration has been replaced by the CoreMotion framework") public protocol UIAccelerometerDelegate : NSObjectProtocol { }

Don't conform to UIAccelerometerDelegate and add only CoreMotion framework.

import CoreMotion

If you want to show animation or create game , you can start with following code.

self.motionManager = CMMotionManager()
self.motionManager?.startAccelerometerUpdates()
if motionManager.isAccelerometerAvailable {          
  motionManager.startAccelerometerUpdates(to: .main) { (data, error) in
    if let myData = data {
        let x =  String(format: "%.3f",myData.acceleration.x)
        let y =  String(format: "%.3f",myData.acceleration.y)
        let z =  String(format: "%.3f",myData.acceleration.z)
    DispatchQueue.main.async { 
          var rect = self.anyObject.frame
         let movetoX = rect.origin.x + CGFloat(myData.acceleration.x * stepMoveFactor)
         let movetoY = rect.origin.y - CGFloat(myData.acceleration.y * stepMoveFactor)
         if ( movetoX > 0 && movetoX < SCREEN_WIDTH ) {
            rect.origin.x += CGFloat(myData.acceleration.x * stepMoveFactor)
         }
         if ( movetoY > 1 && movetoY < maxY ) {
           rect.origin.y -= CGFloat(myData.acceleration.y * stepMoveFactor) }
         }
    }
 }

}

use UIView.animate if you want. This method initiates a set of animations to perform on the view. The block object in the animations parameter contains the code for animating the properties of one or more views.

Answer 2

Here is a useful sample code I found for CoreMotion from this link.

    @interface ViewController ()

    @property (nonatomic, strong) CMMotionManager *motionManager; 
    @property (nonatomic, strong) IBOutlet UILabel *xAxis; 
    @property (nonatomic, strong) IBOutlet UILabel *yAxis; 
    @property (nonatomic, strong) IBOutlet UILabel *zAxis; 

    @end

    @implementation ViewController
    - (void)viewDidLoad 
    { 
      [super viewDidLoad];

      self.motionManager = [[CMMotionManager alloc] init]; 
      self.motionManager.accelerometerUpdateInterval = 1;

      if ([self.motionManager isAccelerometerAvailable]) 
      { 
        NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        [self.motionManager startAccelerometerUpdatesToQueue:queue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
            dispatch_async(dispatch_get_main_queue(), ^{ 
              self.xAxis.text = [NSString stringWithFormat:@"%.2f",accelerometerData.acceleration.x]; 
              self.yAxis.text = [NSString stringWithFormat:@"%.2f",accelerometerData.acceleration.y]; 
              self.zAxis.text = [NSString stringWithFormat:@"%.2f",accelerometerData.acceleration.z];
            });
          }]; 
      } else 
      NSLog(@"not active"); 
    }
@end

Answer 3

You should use the Core Motion framework (introduced in iOS 4.0) as a substitue. Create an instance of CMMotionManager and tell it to startAccelerometerUpdatesToQueue:withHandler:, passing it an NSOperationQueue and a block that will be executed on the specified queue whenever new accelerometer data is available.

Answer 4

Its replaced by CoreMotion. See Motion Events.

Answer 5

It seems that UIAccelerometer and UIAccelerometerDelegate were replaced by the CoreMotion framework.

You can find the answer here:

Why is accelerometer:didAccelerate: deprecated in IOS5?

I Hope it helps.

Answer 6

Add CoreMotion framework to the project first. Then:

#import <CoreMotion/CoreMotion.h>

@property (strong, nonatomic) CMMotionManager *motionManager;

- (void)viewDidLoad {
    _motionManager = [CMMotionManager new];
    _motionManager.accelerometerUpdateInterval = 0.01;       // 0.01 = 1s/100 = 100Hz
    if ([_motionManager isAccelerometerAvailable])
    {
        NSOperationQueue *queue = [NSOperationQueue new];
        [_motionManager startAccelerometerUpdatesToQueue:queue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error){
             NSLog(@"X = %0.4f, Y = %.04f, Z = %.04f",
                   accelerometerData.acceleration.x,
                   accelerometerData.acceleration.y,
                   accelerometerData.acceleration.z);
         }];
    }
}