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Figure 1-4. The classic Cocoa MVC flowchart
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The views themselves are quite dumb: they just know how to display themselves. Most of them are simple UIImageViews, with one exception the background view draws the circles and knows about their positions. Therefore, it also accepts the taps and translates the coordinates back into the tapped circles. This input is then sent directly to the game object, bypassing the controller. The main view controller is responsible for keeping all the views together and animating them. The game logic is isolated in a model object; it keeps the game running and talks to the view controller to make the state of the game visible. This layout leads to the updated flowchart for Formic s objects shown in Figure 1-5.
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Figure 1-5. The MVC flowchart for Formic
CHAPTER 1: Designing a Simple, Frenzic-Style Puzzle Game
You should always try to keep the game logic and graphics separate, though it is sometimes difficult to keep them 100 percent apart from each other. But keeping these functionalities in different objects will make it easier to adapt and fine-tune the game, which is something that will take a lot of the total development time of your game. Good games are not created on the drawing board; you have to play them to see what s great and what s not, and alter accordingly. In the following sections, you will learn to create Formic. We ll starting from an empty project and create the game object that contains all the game logic, the view controller that keeps all the views together and animates them. Finally, we ll create the custom view that sits in the background of all the views, accepts the player s taps, and converts them into logical taps for the circles that are directly fed into the game object.
Setting Up the Project
Before starting to write code, you need to set up a project. From Xcode s File menu, choose New Project, and chose View-Based Application, as shown in Figure 1-6.
Figure 1-6. The New Project dialog in Xcode
This will create a basic project that has a lot of things already set up for you. This simple command created the complete structure of the application, so the only thing left is to create the game object. In this example, I called the project Formic, so it set up the source files for the application delegate and called them FormicAppDelegate.h and FormicAppDelegate.m. It did the same for the view controller, which it created inside an Interface Builder file that it called FormicViewController.xib. It set up the source files for this too, named FormicViewController.h
CHAPTER 1: Designing a Simple, Frenzic-Style Puzzle Game
and FormicViewController.m. Finally, it set up all the necessary connections in Interface Builder so that you already have a convenient FormicViewController variable inside your application delegate. Although these files are created automatically for you, it s a good idea to take a step back and look at what has been created and where to find it. The FormicApplicationDelegate is the starting point. When the application has started, it will call the applicationDidFinishLaunching: method. This is where the code can get things going like creating the game object. The FormicViewController itself lives inside the XIB file. It will be instantiated by the application at startup. You will find a pointer to your view controller in the application delegate, and you will find empty shells for your view controller source files in your project. Just add your controller logic there. Finally, the view that has been set up for you already lives inside the XIB file. This simple UIView will not display anything. To get something displayed, you will have to create a subclass of UIView. To do this, select the Classes group in the project tree and choose New File from Xcode s File menu, as shown in Figure 1-7.
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