Create a new group called Scene.

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

Add a property called guiLayer, which is a SPSPrite type, as shown in the following code:

@property SPSprite* guiLayer;

Add another property called name, which is an NSString, as shown in the following code:

@property NSString* name;

Add a third property called director, which is an id, as shown in the following code:

@property id director;

Add an initializer that initializes the properties of the class:

-(id) init
{
    if ((self = [super init])) {
        self.guiLayer = [[SPSprite alloc] init];
        self.director = nil;
        self.name = @"scene";
    }
    
    return self;
}

Add a second initializer that sets the name of the scene; this should be called initWithName:

-(id) initWithName:(NSString *) name
{
    self = [self init];
    self.name = name...