Hi,
I would like to use a singleton to swap different scenes (SPSprites) with tweened transitions and also allocating and releasing them. I can't seem to add a custom juggler to this class because I cannot advance the time on it by adding an onEnterFrame event listener. When I try to do
[self addEventListener@selector(onEnterFrame:) atObject:self forType:SP_EVENT_TYPE_ENTER_FRAME];
it doesn't work. What should I do?
I've been digging through the SPEventDispatcher class to see how it works. From my tests, everything seems to be working correctly on the sparrow side. My guess is that the singleton class doesn't want to play nice.
I got it working, but you have to add the event listener outside of the singleton class. Like so:
Singleton *singleton = [Singleton sharedSingletonInstance]; [self addEventListener:@selector(loop:) atObject:singleton forType:SP_EVENT_TYPE_ENTER_FRAME];
To be honest, singleton classes are really only meant to hold data to be shared between classes, like a SPTextureAtlas. I suggest you rethink your strategy and also do the scene transitions at the end of each scene, and when the transition ends, then you release the last scene or do any clean up you want.
Brian, one thing in which Sparrow differs from the Flash API is that enter frame events are only dispatched by objects that are in the display tree (i.e. connected to the stage).
So when you add the event listener, it has to be done from some display object - e.g. the stage!
[self.stage addEventListener:@selector(loop:) atObject:singleton forType:SP_EVENT_TYPE_ENTER_FRAME];
Is it possible that I can still do tweened transitions and cleanup from a helper class, or is there a better way to do it? I found myself using the same tweens to do menu transitions (sliding left or right) and thought that I might use them somewhere else in my game too. I'd like to be able to do something like this. Thanks in advance.
//Scenes are SPSprites which have variables in the header file. sceneOne = [[Scene One alloc] init]; [self addChild:sceneOne]; //Same as before, but offscreen to the right sceneTwo = [[Scene Two alloc] init]; sceneTwo.x = 320; [self addChild:sceneTwo]; //To transition (code depends on singleton or not) TransitionHelper *sharedHelper = [TransitionHelper sharedHelper]; sharedHelper.currentScene = sceneOne; sharedHelper.nextScene = sceneTwo; [sharedHelper changeScenesWithDirection:@"left"]; //both scenes slide 320 points to the left, so that sceneTwo is showing //helper class releases sceneOne
Yes, I think that's a good way to do it! I guess the problem is that your TransitionHelper does not receive enter frame events to update his juggler (or tweens)?
Then you could e.g. add a method 'advanceTime:' in that transition helper. In your stage (or anywhere else), you then add an enter frame event listener (if you haven't done so already), and advance the TransitionHelper like this:
- (void)onEnterFrame:(SPEnterFrameEvent *)event { [[TransitionHelper sharedHelper] advanceTime:event.passedTime]; }
The transition helper can then update his animations in this method (if he has a juggler for his own, he forwards the passedTime value to this juggler).
Is this what you were asking for?
What I mean't by that is: I wouldn't have the Singleton do actions on it's own, such as performing a transition tween. I would have the scenes handle that and have the singleton just hold data. But you got it working. 
Daniel, good to know!
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