Cocos2d V3 can't switch scenes after using the UIImagePickerController Class - cocoa

Question

I'm having a little trouble switching scenes (or even displaying sprites) on my CCscene UserLevelCreation, but it only happens after i use the UIImagePickerController to take/accept a picture, And then when I try to switch scenes, It crashes with the error:
"Could not attach texture to framebuffer"
this is the code I use to take a picture:
-(void)takePhoto{
AppController *appdel = (AppController*) [[UIApplication sharedApplication] delegate];
#try {
uip = [[UIImagePickerController alloc] init] ;
uip.sourceType = UIImagePickerControllerSourceTypeCamera;
uip.allowsEditing = YES;
uip.delegate = self;
}
#catch (NSException * e) {
uip = nil;
}
#finally {
if(uip) {
[appdel.navController presentModalViewController:uip animated:NO];
}
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSString * LevelImage;
LevelImage=[info objectForKey:UIImagePickerControllerOriginalImage];
AppController *appdel = (AppController*) [[UIApplication sharedApplication] delegate];
[appdel.navController dismissModalViewControllerAnimated:YES];
[NSThread detachNewThreadSelector:#selector(writeImgToPath:) toTarget:self withObject:LevelImage];
}
And the WriteImageToPath function:
-(void)writeImgToPath:(id)sender
{
UIImage *image = sender;
NSArray *pathArr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
CGSize size;
int currentProfileIndex = 1;
NSString *path = [[pathArr objectAtIndex:0]
stringByAppendingPathComponent:[NSString stringWithFormat:#"CustomLevel_%d.png",currentProfileIndex]];
size = CGSizeMake(1136, 640);
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0, 0, 1136, 640)];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
CCLOG(#"saved...");
CGRect r = CGRectMake(0, 0, 1136, 640);
UIGraphicsBeginImageContext(r.size);
UIImage *img1;
[image drawInRect:r];
img1 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(img1, nil, nil, nil);
currentProfileIndex++;
[[CCDirector sharedDirector] replaceScene:[LevelEditor Scene]
withTransition:[CCTransition transitionPushWithDirection:CCTransitionDirectionLeft duration:1.0f]];
}
-UPDATE----------------------------------------------------------------------------------
I just tried switching scenes in different places in the code, and I can switch scenes freely until the Function:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
I think that function might be the problem.
So far, I have tried to:
1.switch scenes before taking the picture, and that works fine
2.I read that it might be because i was resizing the image, but commenting that out made no difference.
3.I've also added breakpoints before the scene switch, and the scene isn't nil
4.Finally i tred dismissing the uip UIImagePickerController, but that made no difference either.
Sorry for the long post /: if anyone knows whats going on any help would be really great.

Answer 1

Ok so I found the problem to be this line:
[NSThread detachNewThreadSelector:#selector(writeImgToPath:) toTarget:self withObject:LevelImage];
}
Apparently some Parts of Uikit are not thread-friendly, so I'm now using just
[self writeImgToPath];
And it works, hope this helps anyone with the same problem.