Game Development Reference
In-Depth Information
If this particular class doesn't derive from CCScene, Kobold2D will create the CCS-
cene object automatically behind the scenes.
Moving on to the -(id) init method of the HelloWorldLayer class, that's
where the code starts to deviate between cocos2d, Kobold2D, and each individual pro-
ject template. There are some commonalities though. Listing 2-2 represents a minim-
al init code for a "Hello World" app. The actual code in the project differs, but
you'll definitely see a CCLabelTTF being added in the project you created earlier.
Notice something that might seem odd: self is assigned the return value from the
init message sent to the super object in the call to self = [super init] .
If you come from a C++ background, you'll shudder in pain looking at this. Don't get
too upset; it's all right. It simply means that in Objective-C you have to manually call
the superclass's init method. There's no automatic call to the parent class. And you
do have to assign self the return value of the [super init] message because
it might return nil .
Listing 2-2 . The init Method
Creates and Adds a “Hello World” Label
-(id) init
if ((self = [super init]))
// create and initialize a label
CCLabelTTF* label = [CCLabelTTF labelWithString:@"Hello World"
fontName:@"Marker Felt"
// get the window (screen) size from CCDirector
CGSize size = [[CCDirector sharedDirector] winSize];
// position the label at the center of the screen
label.position = CGPointMake(size.width / 2, size.height / 2);
// add the label as a child to this Layer
[self addChild:label];
return self;
The CCLabelTTF class draws text on the screen using a TrueType font.
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