Reputation: 1652

How to get accelerometer data in IOS?

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 to get the accelerometer data? The documentation does not mention the alternative we are supposed to use.

Upvotes: 11

Answers (6)

Shrikant Phadke

Reputation: 418

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@available(iOS, introduced: 2.0, deprecated: 13.0, message: "UIAcceleration has been replaced by the CoreMotion framework") public protocol UIAccelerometerDelegate : NSObjectProtocol { }

Add CoreMotion framework only. Don't conform to UIAccelerometerDelegate.

import CoreMotion

If you want to show animation or create a game, you can start with the 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.

swift ios

Upvotes: 0

AndrewK

Reputation: 927

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);
         }];
    }
}

Upvotes: 1

user2431285

Reputation: 661

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

Upvotes: 4

hburde

Reputation: 1441

Its replaced by CoreMotion. See Motion Events.

Upvotes: 3

Ole Begemann

Reputation: 135548

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.

Upvotes: 13