CCSpriteオブジェクトで実行時にこれらのメソッドを呼び出すことができたので、CCSpriteBatchNodeでバッチ処理することにしたので、もう機能していないようです。
sprt = [CCSprite spriteWithSpriteFrameName:@"sprt.png"];
sprt.anchorPoint = CGPointMake(0.5f, 0.5f);
sprt.position = CGPointMake(40.0f, 60.0f);
[batchNode addChild:sprt z:-1]; // It used to work when I was simply "adding as child" the sprt object, I guess now doesn't set the order anymore because somehow the CCSpriteBatch node doesn't allow the re-ordering of child added to it
CCCallFunc *callback = [CCCallFunc actionWithTarget:self selector:@selector(moveBackwards)];
CCCallFunc *callback2 = [CCCallFunc actionWithTarget:self selector:@selector(moveForward)];
[sprt runAction: [CCRepeatForever actionWithAction: [CCSequence actions: callback2, callback , nil]]];
-(void) moveBackwards
{
[sprt setZOrder:-1];
}
-(void) moveForward
{
[sprt setZOrder:1];
}