Xcode Objective C Yaw Pitch Roll : I'm trying to display the yaw pitch and roll of the device in a label. I cannot seem to get the values to display, it only shows a '...' where the numbers should be. This is my code, any help is greatly appreciated. 

    #import "ViewController.h"
    #import <CoreMotion/CoreMotion.h>
    
    @interface ViewController (){
        
    }
    @property (strong, nonatomic) CMMotionManager *motionManager;
    @end
    
    @implementation ViewController
    
    @synthesize motionManager;
    @synthesize roll;
    @synthesize pitch;
    @synthesize yaw;
    
    @synthesize xLabel;
    @synthesize yLabel;
    @synthesize zLabel;
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        /** Do any additional setup after loading the view, typically from a nib.
        UIAccelerometer *accelerometer = [UIAccelerometer sharedAccelerometer];
        accelerometer.updateInterval = 1.0f/60.0f;
        accelerometer.delegate = self;
         **/
        //motionManager = [[CMMotionManager alloc] init];
        //motionManager.deviceMotionUpdateInterval = 1.0 / 60.0;
        
        motionManager = [[CMMotionManager alloc] init];
        NSTimer *timer;
        timer = [NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(doGyroUpdate) userInfo:nil repeats:YES];
        
        //CMDeviceMotion *deviceMotion = motionManager.deviceMotion;
        //CMAttitude *attitude = deviceMotion.attitude;
        
        [motionManager startDeviceMotionUpdates];
    }
    
    -(void)doGyroUpdate
    {
        double x = motionManager.deviceMotion.attitude.roll*180/M_PI;
        double y = motionManager.deviceMotion.attitude.pitch*180/M_PI;
        double z = motionManager.deviceMotion.attitude.yaw*180/M_PI;
        
        NSString *myString = [NSString stringWithFormat:@"%g", x];
        xLabel.text = myString;
        myString = [NSString stringWithFormat:@"%f", y];
        yLabel.text = myString;
        myString = [NSString stringWithFormat:@"%f", z];
        zLabel.text = myString;
    }