Cocos2d创建场景Scene方法

下面是一个通用的例子

+(id) scene
{
	// 'scene' is an autorelease object.
	CCScene *scene = [CCScene node];
	
	// 'layer' is an autorelease object.
	//HelloWorld *layer = [HelloWorld node];
	id layer = [HelloWorld node];
	
	// add layer as a child to scene
	[scene addChild: layer];
	
	// return the scene
	return scene;
}