Create a new Objective-C class called SceneDirector, which is derived from the SPSprite class, and save it in the Scene group.

Add an instance variable called _dict, which is an NSMutableDictionary type.

Add an instance method that will add a scene to the scene director, as shown in the following code:

-(void) addScene:(Scene *)scene;

Add a second instance method that will add a scene, but this time you are also able to define/overwrite the name of the scene:

-(void) addScene:(Scene *)scene withName:(NSString *)name;

Add an instance method that will show a scene and take NSString as its parameter, as shown in the following code:

-(void) showScene:(NSString *)name;

Let's switch to the implementation. The initializer should initialize the _dict variable.

Implement the addScene:(Scene *)scene withName:(NSString *)name method with the following piece of code:

-(void) addScene:(Scene...