Question

I have a worker thread doing calculation on the background and I want to send a event/message to call a update function to update the graphics on screen once the worker thread finish calculation.

How do I do that in cocos2d ?

Some demo code:

-(void) updateGraphic
{
//this one update all the graphics/sprite
}

//note workerThreadFunc is being used to start a new thread
-(void) workerThreadFunc
{
//...
//...
//finish calculation here
//since it's in a different thread, I cannot call updateGraphic directly here
//So I need a event to notify update Graphic here somehow

}

Answer 1

Cocos2D calls the -(void) draw {} method on all nodes automatically on the main thread. You do not need to call that method from another thread, and you can not perform custom OpenGL drawing outside the draw method.

In order to call a method that should be performed on the main thread, use the performSelectorOnMainThread method.