COCOS2D: ScrollView inside a CCScene blocks animation - iphone

Question

I have a CCScene. In its right side I need to have a UIScrollView with some menu elements. I did it this way as I have explained in this previous question Cocos2d and UIScrollView
here is the method creating my scene
+(id) scene: (int) wld{
CCScene *scene = [CCScene node];
LevelsMenu *layer = [LevelsMenu node];
layer = [layer init:wld];
[scene addChild: layer];
[layer setScrollView:[LevelMenuControlView alloc]];
[[[CCDirector sharedDirector] openGLView] addSubview:layer.scrollView.view];
return scene;
}
notice that LevelMenuControlView is just an UIViewController implemented this way:
- (void)loadView{
LevelMenuView *scrollView = [[LevelMenuView alloc] initWithFrame:[UIScreen
mainScreen].applicationFrame];
scrollView.contentSize = CGSizeMake(862, 480);
scrollView.delegate = scrollView;
[scrollView setUserInteractionEnabled:TRUE];
[scrollView setScrollEnabled:TRUE];
[scrollView setShowsVerticalScrollIndicator:FALSE];
[scrollView setShowsHorizontalScrollIndicator:FALSE];
self.view = scrollView;
[scrollView release];
}
While LevelMenuView is the UIScrollView containing the menu elements
It works quite fine. Now the problem is that in the left side of the scene I have a sprite animation that, If I do not touch the screen fine but as soon as I drag the scroll view up or down stops or goes at the same speed of my scrolling finger!!!
Any idea?

Answer 1

I have found this link where someone already experienced the same problem and posted a solution which actually works
http://www.cocos2d-iphone.org/forum/topic/11645
It basically consists in adding this code to the scroll view:
// This should go in your interface.
NSTimer *timer;
// Override
- (void)setContentOffset:(CGPoint)contentOffset {
// UIScrollView uses UITrackingRunLoopMode.
// NSLog([[NSRunLoop currentRunLoop] currentMode]);
// If we're dragging, mainLoop is going to freeze.
if (self.dragging && !self.decelerating) {
// Make sure we haven't already created our timer.
if (timer == nil) {
// Schedule a new UITrackingRunLoopModes timer, to fill in for
CCDirector while we drag.
timer = [NSTimer scheduledTimerWithTimeInterval:[[CCDirector sharedDirector] animationInterval] target:self selector:#selector(animateWhileDragging) userInfo:nil repeats:YES];
// This could also be NSRunLoopCommonModes
[[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopModes];
}
}
// If we're decelerating, mainLoop is going to stutter.
if (self.decelerating && !self.dragging) {
// Make sure we haven't already created our timer.
if (timer == nil) {
// Schedule a new UITrackingRunLoopMode timer, to fill in for CCDirector while we decellerate.
timer = [NSTimer scheduledTimerWithTimeInterval:[[CCDirector sharedDirector] animationInterval] target:self selector:#selector(animateWhileDecellerating) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopMode];
}
}
[super setContentOffset:contentOffset];
}
- (void)animateWhileDragging {
// Draw.
[[CCDirector sharedDirector] drawScene];
if (!self.dragging) {
// Don't need this timer anymore.
[timer invalidate];
timer = nil;
}
}
- (void)animateWhileDecellerating {
// Draw.
[[CCDirector sharedDirector] drawScene];
if (!self.decelerating) {
// Don't need this timer anymore.
[timer invalidate];
timer = nil;
}
}
Thanks a lot to these guys