Errata

In chapter 1 the first code sample in the section "creating a component-based game layout" looks like it mistakenly uses code from the Objective-C version of this book. I was expecting to see swift code here.

The Component class is shown by example in Objective-C although this is a Swift text. Also, shouldn't the first class be @class Component as per the explanation (in Obj-C)?


“Solution

First, define a Component class. This class represents components that are attached to game objects—it is a very simple class that, at least initially, only has a single method and a single property:

@class GameObject;
@interface Component : NSObject

- (void) update:(float)deltaTime;

@property (weak) GameObject* gameObject;
@end

Next, define a GameObject class. This class represents game objects:

class Component: NSObject {

// The game object this component is attached to
var gameObject : GameObject?

func update(deltaTime : Float) {
// Update this component
}

}
”

Excerpt From: Jonathon Manning & Paris Buttfield-Addison. “iOS Swift Game Development Cookbook.” iBooks.