Objective-c + cocos2d + accelerometer not working - objective-c

Question

I'm looking for some help integrating UIAccelerometer into my cocos2d based application. My current design is roughly the following:
1 -- My HelloWorldLayer layer has a private variable -- a class called Manager -- that I will refer to as the data manager. It is the primary data management class that provides information to the UI.
2 -- The HelloWorldLayer's update method calls to the data manager's update method.
3 -- The data manger allocates a new object -- a class called accelerationMeter -- that provides accelerometer data and updates a custom data object that I'm using to track the devices current acceleration.
4 -- The accelerationMeter class sets up the accelerometer like so:
-(id) init
{
if (self == [super init])
{
// the below call is only used if this object extends CCLayer. Right now it extends NSObject
// self.isAccelerometerEnabled = YES;
[[UIAccelerometer sharedAccelerometer] setUpdateInterval: 1/60];
[[UIAccelerometer sharedAccelerometer] setDelegate: self];
// my data type to store acceleration information
self.currVector = [[vector alloc] init];
}
return self;
}
// method called when the UIAccelerometer updates
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
[self currVector].x = acceleration.x;
[self currVector].y = acceleration.y;
NSLog([NSString stringWithFormat:#"accelerometer: x = %f, y = %f",self.currVector.x,self.currVector.y]);
}
5 -- After (seemingly exactly) 1 second of successful data collection from the UIAccelerometer, the NSLog line in the "accelerometer" method stoops logging. Therefore, the delegated method stops being called.
6 -- As per request, here is the code I use to integrate the accelerometer:
// source: HelloWorldLayer.mm
// purpose: update scene
-(void) update: (ccTime) dt
{
<snip>
world->Step(dt, velocityIterations, positionIterations);
[self updateData];
<snip>
}
// source: HelloWorldLayer.mm
// purpose: update data and use that for the accelerometer display
-(void) updateData
{
if(dataManager)
{
[dataManager update]
<snip>
float accelX = [dataManager currentAcceleration].x;
float accelY = [dataManager currentAcceleration].y;
<snip>
}
}
// source: Manager.m (the data manager class)
// called by updater method copied above this
-(void) update
{
// replace outdated current accleration with the updated current accel
// right now, the accelMonitor class just returns the value of the current acceleration so I will omit the monitor class
currentAcceleration = [accelMonitor getCurrent];
NSLog(#"Manger: Update called");
}
// source accelerationMeter.m
// called by (through an intermediate class) Manager
// I have verified that this method continues to be called after the accelerometer stops working
-(vector*) getCurrentAcceleration
{
NSLog(#"accelerationMeter: getCurrentAcceleration called");
return self.currVector;
}
Note I am not using the IOS simulator -- I am reading the logs from the console of my device.
My main questions are the following:
A -- Why could the accelerometer's delegated method stop being executed?
B -- How can I resolve this so that I can make use of the accelerometer data for > 1 second?

Answer 1

Solved!
I ended up adding the accelerationMeter as a node to the HelloWorldLayer layer. I think that this had something to do with the runloop going out of scope or switching modes, which would therefore stop the accelerometer from collecting data, though I'm unsure.