Making Compass

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize locationManager;

@synthesize compassImage;

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    

    locationManager=[[CLLocationManager alloc] init];

locationManager.desiredAccuracy = kCLLocationAccuracyBest;

locationManager.delegate=self;

if( [CLLocationManager locationServicesEnabled]

       &&  [CLLocationManager headingAvailable]) {

        [locationManager startUpdatingLocation];

        [locationManager startUpdatingHeading];

        locationManager.headingFilter = 1;

    } else {

        NSLog(@"Can't report heading");

    }

}

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading{

// Convert Degree to Radian and move the needle

float oldRad =  -manager.heading.trueHeading * M_PI / 180.0f;
float newRad =  -newHeading.trueHeading * M_PI / 180.0f;
CABasicAnimation *theAnimation;

theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.rotation"];

theAnimation.fromValue = [NSNumber numberWithFloat:oldRad];
theAnimation.toValue=[NSNumber numberWithFloat:newRad];
theAnimation.duration = 0.5f;

    //theAnimation.removedOnCompletion = NO;

    //theAnimation.fillMode = kCAFillModeForwards;

    //theAnimation.timingFunction =[CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];

[compassImage.layer addAnimation:theAnimation forKey:@"animateMyRotation"];

    

compassImage.transform = CGAffineTransformMakeRotation(newRad);

NSLog(@"%f (%f) => %f (%f)", manager.heading.trueHeading, oldRad, newHeading.trueHeading, newRad);
}

@end