Question

We are trying to use the gyro , i have read about it, and i have this code running :

-(void)acceleratedInX:(float)xx Y:(float)yy Z:(float)zz
{
    NSLog(@"%f",xx); //x value
    NSLog(@"%f",yy); //y value
    NSLog(@"%f",zz);
}

i know that xcode should update this function when i put it on my delegate.
i just want to print up the x,y,z values
BUT its not happening..i dont get the NSLog, so the function isnt being called.
any help would be great
thanks a lot .

Answer 1

You need to set up the update interval.

Your header should look like this:

@interface MyViewController : UIViewController <UIAccelerometerDelegate>

At the top of your .m declare this constant:

#define kAccelUpdate 30.0

in your viewDidLoad:

UIAccelerometer *theAccel = [UIAccelerometer sharedAccelerometer];
[theAccel setUpdateInterval:1.0/kAccelUpdate];
[theAccel setDelegate:self];

then your listening method:

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
    NSLog(@"%g", acceleration.x);
    NSLog(@"%g", acceleration.y);
    NSLog(@"%g", acceleration.z ;
}

Also eventually you will have to put smoothing code in otherwise the accel is really jittery.