Acclerometer problem with scene replace.

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Acclerometer problem with scene replace.

(14 posts) (6 voices)

Started 2 years ago by serveace6
Latest reply from yemibedu

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serveace6
Member

Hi,

I have a single scene with a layer that uses the accelerometer to perform certain tasks. This layer also contains a MenuItem that calls the Director's replaceScene with this same scene, essentially restarting the scene from scratch. However, there appears to be an issue with the accelerometer if I use a transition in the replaceScene because the accelerometer will stop registering. If I do not use the transition, the accelerometer works as expected. At first I thought it was a specific transition type but it occurs on all. I am going to see if this occurs on 0.8.2 as I'm currently using 0.8.1, but has any experienced this problem?

Posted 2 years ago #
crmagicxxx
Member

I had it. Put declarations for accelerometer in onEnter method. That worked for me

Posted 2 years ago #
serveace6
Member

Did you do it directly to the cocos2d source or just your local usage?

Posted 2 years ago #
QcMat
Member
Try to put this in your scene's dealloc method or anywhere else where it would fit:
```
accelerator.delegate = nil;
```
Posted 2 years ago #
serveace6
Member

QcMat: I tried to put [[UIAccelerometer sharedAccelerometer] setDelegate:nil] in my dealloc method and it still has the issue.

crmagicxxx: Can you provide more details?

Posted 2 years ago #
crmagicxxx
Member
Well, I lied to you when I told you I put it in onEnter method. It actually didn't work there when restarting the scene. I ended up with onEnterTransitionDidFinish:
```
-(void) onEnterTransitionDidFinish {
		self.isAccelerometerEnabled = YES;
		[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
		[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0f / 60.0f)];
}
```
setIdleTimerDisabled method is to disable light going off on iphone...

Hope it works for you too...
Posted 2 years ago #
serveace6
Member

It worked for me but but not as expected since it is constantly being called on my layer for some reason and it causing major slowdown issues. What I looked to instead was the Cocos2d's source Layer.m and added a "isRunning" check tot he onExit() method like so,

-(void) onExit
{
if( isTouchEnabled )
[[TouchDispatcher sharedDispatcher] removeDelegate:self];

if( isAccelerometerEnabled && !isRunning)
[[UIAccelerometer sharedAccelerometer] setDelegate:nil];

[super onExit];
}

Not sure if there's any ill effects of this but it appears on the onEnter() method the "isRunning" is checked to figure out if the delegate is set for the accelerometer. Any thoughts?

Posted 2 years ago #
mobilebros
Moderator

This was definitely an issue in 0.8.2rc as well; not sure if the release contained the bug or not. Anyone know if there are plans to fix this, I didnt see an issue recorded on google code.

Posted 2 years ago #
mobilebros
Moderator
I thought about this a little bit more and it seems like Layer should only set the accelerometer's delegate to nil if IT IS the delegate. So for example, the onExit routine would contain a modified "if" statement that would look like this:
```
if (isAccelerometerEnabled && [[UIAccelerometer sharedAccelerometer] delegate] == self)
   [[UIAccelerometer sharedAccelerometer] setDelegate:nil];
```
I'm quite sure this is the right fix, but unsure if it is already a planned fix....
Posted 2 years ago #
serveace6
Member

Yeah, I have not looked into it further since my original change allowed me to continue what I'm working on but you may be right about the delegate check. I'll give it a try and see if it's the fix but I'm wondering if a fixed is already planned or not.

Posted 2 years ago #
mobilebros
Moderator

Ok, I'm going to go ahead and log an issue in the tracker for this.

Posted 2 years ago #
serveace6
Member

Sorry for the delay, been real busy with the other stuff. But I had a chance to make that change and it definitely fixes the issue. Hopefully I'll be a part of the planned fixes.

Posted 2 years ago #
micah
Member

I know this is an older post, but I just want to say that it hasn't been fixed yet in cocos2d 0.99.0. I'm having the exact same problem. I dug up this post trying to find a solution to it. Editing the onExit method in CCLayer.m like stated above fixes it. This fix should probably be included in the next release.

Posted 1 year ago #
yemibedu
Member

Hello,
I am using v0.8.2 and had this trouble initially. I had a seperate class for handling the accelerometer and it made a singleton to be used by any layer. What I needed was to setup a dealloc in that class, use the [[UIAccelerometer sharedAccelerometer] setDelegate:nil] call and call this from the using layers dealloc. Good day.

Posted 1 year ago #

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