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The iOS Game Programming Collection (Collection)
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Integrating Achievements and Leaderboards into Your iOS Game Using Game Center
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Trusted by thousands of developers around the world. Nick Kohrn. Fred A. Time to learn some Android development! Erik S. Vincent Saluzzo. Johannes Fahrenkrug. Richard Hancock. You can then change the elements buttons, labels, pickers, etc. These gizmos are called inspectors, and they govern the properties of each of the elements.
You need the following metrics to properly set everything up — make sure you watch the video! It sets up the application and gives it a starting point for the first interface. First, add this property to the AppDelegate class:. Telling the compiler what variables to use, and which type and which name, is called declaring or declaration.
When nothing happens, you might have made an error somewhere.
Creating a Simple Maze Game for iPhone – Part 1
Feel free to ask a question in the comments of this post. Also, check if you set the right Build Target iPhone Simulator. Pick an iPhone model to use in the Simulator by using the dropdown list on the right of the Play button. When the app runs, you should see your interface pop up on the screen.
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Switch to MainViewController. Do you notice the structure of the file? In order to use the interface elements we created with Interface Builder inside the MainViewController.
Such a connection is called an outlet , and the statement to create an outlet goes like this:. Now, go to MainViewController. Repeat the same step for the score and the textfield.
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Switch back to the MainViewController. See how this is different from a property or an outlet? The viewDidLoad function is overridden with the override statement, just before the func statement. Do you see it? It means that the superclass UIViewController of our class MainViewController has a function with the same name, and we overwrite it with new functionality.
Whenever this function is called in the app lifecycle, our function is called, and not the function of the superclass.
- iOS Programming Tutorial: How To Create a Simple Maze Game.
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This allows us to customize the behaviour of the controller and the interface, and hooking into the view lifecycle that the UIViewController has. The target, MainViewController , is indicated by self. The event will be fired when the text inside the text field changes, so when you type something in it. For each character you type, it fires an event, and so it executes the function we just gave it.
And there you have it, a running game! Run the app by hitting Command-R and see if you can play it. Encounter any errors? Ask for help in the comments, and backtrace your steps in case you missed something. Run the app, and try out the functionality. If you followed closely, your app should do this:. Want to know how you can make the Add 1 game work with numbers from 0 to 9? Read this short guide to learn how. We can download the source code for the framework on GitHub and inspect it ourselves.
You see, in order to work with third-party code, we need to import it in our project as a library. Cocoapods is a dependency manager , a quick way to import and maintain third-party code that we use in our projects. In order to work with it, we just declare a file, write down the names of the libraries we want to use, and Cocoapods takes care of the rest. Now, get back to Xcode and create a new empty file. You do that by right-clicking on the project in the Project navigator on the left, then choosing New file Create the file in the root topmost directory of the project.
Name the file Podfile , without extension. Then, go back to Terminal and cd into the directory of your app. In case you get a No such file or directory error, run this command before running pod install :. We need to work within the Workspace , that contains both projects. Fortunately, we can create a so-called bridging header to use the library from within our Swift code.
Swift and Objective-C can be integrated with one another by creating a connection, a Bridging Header. Both languages work with header files , a certain type of file that describes the functions of a class to the compiler. But, both Swift and Objective-C have different syntax for describing classes and functions.
First, add the following line to the top of MainViewController. Then, add in viewDidLoad the following code, just under super. So, we can deduct that this function must show the HUD, considering the correctness of the answer.
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That last function is kinda special! In short, it makes use of Grand Central Dispatch. It takes 3 parameters: the execution time, the dispatch queue, and a closure with the actual code. It executes the code inside the closure with a delay. Can you figure out which one you need to add where?
See if what you just made is working! You should be able to enter a number, and then see the HUD briefly appear with either a thumbs up or down. Open up Xcode if you have not done so already, and locate the file. Add these two lines at the top of the class, just below the declaration of hud.