Codea Tutorials: Tutorial 30 - Codea v1.5.2: Objective C Add On, Game Center

Figure 0. iOS Dev Center

30.1 Overview

CodeaAddon is an experimental protocol for adding native extensions to exported Codea projects. You must deal with Lua directly to register your functions and globals. This protocol should be considered alpha and is subject to change in future Codea releases.As with the previous tutorial on iAds, we have provided a lot of background on Game Center in these tutorials:

Have a look at the above to refresh your knowledge on what is required from an iTunes Connect perspective as we will only cover that area briefly in this tutorial.

Figure 1. Find out the Bundle Identifier for your App.

30.2 Registering your Application in iTunes Connect

In order to test your app's Game Center functionality you need to register an app ID associated with this app which enables Game Center. The association is done via the bundle identifier of your app (Figure 1). Click on the app title in the top left of the project navigator screen in Xcode to bring up this screen. Make sure that you have selected the "Summary" tab. Write down the bundle identifier shown, we will need this shortly.

Figure 2. Set up a new App ID for your app.

Log into your apple developer account, go to the iOS Dev Center (Figure 0) and select the Certificates, Identifiers & Profiles link on the right hand side of the page. Select a name for your app ID (pick something you can remember e.g. we used AudioDemoAppID) and fill in the App ID Suffix bundle identifier. This is the critical step which will link your app to the configuration in iTunes Connect. Use the bundle identifier that you wrote down earlier. Click "confirm" and then "submit".

Figure 3. Associate your bundle identifier with the App ID.

Head back to the iOS Dev Center (Figure 0) and this time click on iTunes Connect link in the top right of the page. You will be asked to sign in again, do so and then click on the Manage your Apps link (Figure 4).

Figure 4. iTunes Connect

On the Manage your Apps page (Figure 5), click on the "Add New App" button at the top left of the screen. Click on iOS App on the next screen.

Figure 5. Manage your Apps

Fill in the app name, SKU number (this can be any unique identifier, we normally use the date), and then select the App ID that you just created for the bundle identifier (Figure 6). Click "Continue" when you are done.

Figure 6. iTunes Connect App Information.

Fill in all the meta data (have a look at the earlier tutorials if you get stuck) and save the configuration. When you are done (Figure 7), we can enable Game Center for your app. Click on the "Manage Game Center" button on the right hand side of the page (Figure 7).

Figure 7. Metadata addition complete.

Click on the button that says "Enable for Single Game" and then either configure some achievements and leader boards or just click "Done". We can now test our exported app once we have included the Game Center add on.

Figure 8. Adding the GameKit Framework.

30.3 Add the GameKit Framework to Your App

Fire up Xcode and load the exported version of your Codea application (See Tutorial 27). Click on the imported project file at the top of the project navigator then in the Build Phases tab, scroll down to the link binary with libraries area and select the drop down arrow. Click on the "+" button below your existing frameworks to add a new framework. Find GameKit and click on "Add"

30.4 Changes to your Exported AppDelegate Files

All of the source code files are provided at the end of this tutorial. You need to update AppDelegate.h as follows:

//
// AppDelegate.h
// AudioDemo
//
// Used to demonstrate the audio, game center and iAds add on libraries
//
// Created by Reefwing Software on Sunday, 14 April 2013
// Copyright (c) Reefwing Software. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "AudioAddOn.h"
#import "IAdsAddOn.h"
#import "GameCenterAddOn.h"

@class CodeaViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) IAdsAddOn *iAdsAddOn;
@property (strong, nonatomic) AudioAddOn *audioAddOn;
@property (strong, nonatomic) GameCenterAddOn *gameCenterAddOn;
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) CodeaViewController *viewController;

@end

And AppDelegate.mm, should now look like:

//
// AppDelegate.mm
// AudioDemo
//
// Created by Reefwing Software on Sunday, 14 April 2013
// Copyright (c) Reefwing Software. All rights reserved.
//

#import "AppDelegate.h"
#import "CodeaViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[CodeaViewController alloc] init];

// Create and add our AudioAddOn to Codea

self.audioAddOn = [[AudioAddOn alloc] init];
[self.viewController registerAddon: self.audioAddOn];

// Create and add our iAdsAddOn to Codea

self.iAdsAddOn = [[IAdsAddOn alloc] init];
[self.viewController registerAddon: self.iAdsAddOn];

// Create and add our GameCenterAddOn to Codea

self.gameCenterAddOn = [[GameCenterAddOn alloc] init];
[self.viewController registerAddon: self.gameCenterAddOn];

NSString* projectPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"AudioDemo.codea"];

[self.viewController loadProjectAtPath:projectPath];

self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];

return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application
{

}

- (void)applicationDidEnterBackground:(UIApplication *)application
{

}

- (void)applicationWillEnterForeground:(UIApplication *)application
{

}

- (void)applicationDidBecomeActive:(UIApplication *)application
{

}

- (void)applicationWillTerminate:(UIApplication *)application
{

}

@end

Obviously there is no need to register the iAds and Audio add ons if you are just using Game Center. We have just left these in to demonstrate how you can stack add ons.

Figure 9. If you try to show Achievements or Leaderboards with none set up in iTunes Connect, you will see this screen.

30.5 The Game Center Add On

You need to add the GameCenterAddOn.h and GameCenterAddOn.m files to your project (plus the other iAds and Audio add on classes if you are using them). These are available below.

To do this, right click on the Addons folder in the project navigator and select Add files to "YourProjectName"... Navigate to where ever you saved these files and select them.

This Game Center Add On will make four new functions available in your Lua code:

gameCenterStart();

showLeaderBoardWithIdentifier(int ident);

showAchievementsView(); and

playerIsAuthenticated;

You need to call gameCenterStart() first as your game must authenticate a local player before you can use any Game Center classes.

Figure 10. You may need to sign in the first time you try to authenticate a player.

If you want to add more Game Center functionality the just follow the pattern in the add on. For example, if you want to add a save score function then, in GameCenterAddOn.h add:

static int saveScore(struct lua_State *state);

Then in GameCenterAddOn.m add/modify:

// Add to method

- (void)codea:(CodeaViewController*)controller didCreateLuaState:(struct lua_State*)L
{
...
lua_register(L, "saveScore", saveScore);
...
}

// New Objective C method

- (void) saveNewScore: (int) score
{
// INSERT YOUR LEADERBOARD IDENTIFIER IN THE LINE BELOW
// Replace "Easy Difficulty" with your identifier from iTunes Connect

GKScore *scoreReporter = [[GKScore alloc] initWithCategory: @"Easy Difficulty"];

if (scoreReporter)
{
scoreReporter.value = score;

[scoreReporter reportScoreWithCompletionHandler: ^(NSError *error)
{
if (error != nil)
{
// handle the reporting error

NSLog(@"Game Center: Error Saving Score - %@", [error localizedDescription]);
}
}];
}
}

// New C function

static int saveScore(struct lua_State *state)
{
[gameCenterAddOnInstance saveNewScore: lua_tonumber(state, 1)];

return 0;
}

Then in your Lua code you can use saveScore(yourNewScore).

Figure 11. Player Authenticated.

30.6 Download the Code

	//
	// AppDelegate.h
	// AudioDemo
	//
	// Used to demonstrate the audio, game center and iAds add on libraries
	//
	// Created by Reefwing Software on Sunday, 14 April 2013
	// Copyright (c) Reefwing Software. All rights reserved.
	//

	#import <UIKit/UIKit.h>
	#import "AudioAddOn.h"
	#import "IAdsAddOn.h"
	#import "GameCenterAddOn.h"

	@class CodeaViewController;

	@interface AppDelegate : UIResponder <UIApplicationDelegate>

	@property (strong, nonatomic) IAdsAddOn *iAdsAddOn;
	@property (strong, nonatomic) AudioAddOn *audioAddOn;
	@property (strong, nonatomic) GameCenterAddOn *gameCenterAddOn;
	@property (strong, nonatomic) UIWindow *window;
	@property (strong, nonatomic) CodeaViewController *viewController;

	@end

view raw AppDelegate.h hosted with ❤ by GitHub

	//
	// AppDelegate.mm
	// AudioDemo
	//
	// Created by Reefwing Software on Sunday, 14 April 2013
	// Copyright (c) Reefwing Software. All rights reserved.
	//

	#import "AppDelegate.h"
	#import "CodeaViewController.h"

	@implementation AppDelegate

	- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions
	{
	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
	self.viewController = [[CodeaViewController alloc] init];

	// Create and add our AudioAddOn to Codea

	self.audioAddOn = [[AudioAddOn alloc] init];
	[self.viewController registerAddon: self.audioAddOn];

	// Create and add our iAdsAddOn to Codea

	self.iAdsAddOn = [[IAdsAddOn alloc] init];
	[self.viewController registerAddon: self.iAdsAddOn];

	// Create and add our GameCenterAddOn to Codea

	self.gameCenterAddOn = [[GameCenterAddOn alloc] init];
	[self.viewController registerAddon: self.gameCenterAddOn];

	NSString* projectPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"AudioDemo.codea"];

	[self.viewController loadProjectAtPath:projectPath];

	self.window.rootViewController = self.viewController;
	[self.window makeKeyAndVisible];

	return YES;
	}

	- (void)applicationWillResignActive:(UIApplication *)application
	{
	}

	- (void)applicationDidEnterBackground:(UIApplication *)application
	{
	}

	- (void)applicationWillEnterForeground:(UIApplication *)application
	{
	}

	- (void)applicationDidBecomeActive:(UIApplication *)application
	{
	}

	- (void)applicationWillTerminate:(UIApplication *)application
	{
	}

	@end

view raw AppDelegate.mm hosted with ❤ by GitHub

	//
	// AudioAddOn.h
	// AudioDemo
	//
	// Created by David Such on 13/04/13.
	// Copyright (c) 2013 Reefwing Software. All rights reserved.
	//
	// Version: 1.0 - Original (13/04/13)
	// 1.1 - Volume control & monitoring added, metering enabled (14/04/13)
	// 1.2 - Minor refactoring (19/04/13)

	#import <Foundation/Foundation.h>
	#import <AVFoundation/AVFoundation.h>
	#import "CodeaAddon.h"

	id audioAddOnInstance;

	// This class conforms to the CodeaAddon & AVAudioPlayerDelegate Protocols

	@interface AudioAddOn : NSObject<CodeaAddon, AVAudioPlayerDelegate>

	@property (strong, nonatomic) AVAudioPlayer *player;

	// Forward declare our Lua Audio functions. These are static to confine their scope
	// to this file. By default c functions are global.

	static int playMusic(struct lua_State *state);
	static int stopMusic(struct lua_State *state);

	static int getVolume(struct lua_State *state);
	static int setVolume(struct lua_State *state);

	static int peakPowerForChannel(struct lua_State *state);
	static int averagePowerForChannel(struct lua_State *state);

	@end

view raw AudioAddOn.h hosted with ❤ by GitHub

	//
	// AudioAddOn.m
	// AudioDemo
	//
	// Created by David Such on 13/04/13.
	// Copyright (c) 2013 Reefwing Software. All rights reserved.
	//
	// Version: 1.0 - Original (13/04/13)
	// 1.1 - Volume control & monitoring added, metering enabled (14/04/13)
	// 1.2 - Minor refactoring (19/04/13)

	#import "AudioAddOn.h"
	#import "lua.h"

	@implementation AudioAddOn

	#pragma mark - Initialisation

	- (id)init
	{
	self = [super init];
	if (self)
	{
	// Initialise the Audio Player with your mp3 file.

	NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
	pathForResource:@"LunarLander"
	ofType:@"mp3"]];

	NSError *error;

	_player = [[AVAudioPlayer alloc] initWithContentsOfURL: url error: &error];

	if (error)
	NSLog(@"Error initialiasing Audio Add On: %@", [error localizedDescription]);
	else
	{
	// Player initialised, assign delegate to this class

	[_player setDelegate: self];

	// Calling prepareToPlay preloads buffers and acquires the audio hardware needed for playback,
	// which minimizes the lag between calling the play method and the start of sound output.

	[_player prepareToPlay];

	// A value of 0, which is the default, means to play the sound once. Set a positive integer
	// value to specify the number of times to return to the start and play again. For example,
	// specifying a value of 1 results in a total of two plays of the sound. Set any negative
	// integer value to loop the sound indefinitely until you call the stop method.

	[_player setNumberOfLoops: -1];

	// The default value for the meteringEnabled property is off (Boolean NO). Before using metering
	// for an audio player, you need to enable it by setting this property to YES.

	[_player setMeteringEnabled: YES];

	// audioAddOnInstance allows us to access self from within the c functions.

	audioAddOnInstance = self;
	}
	}
	return self;
	}

	#pragma mark - CodeaAddon Delegate

	// Classes which comply with the <CodeaAddon> Protocol must implement this method

	- (void) codea:(CodeaViewController)controller didCreateLuaState:(struct lua_State)L
	{
	NSLog(@"AudioAddon Registering Functions");

	// Register the Audio functions, defined below

	lua_register(L, "playMusic", playMusic);
	lua_register(L, "stopMusic", stopMusic);
	lua_register(L, "setVolume", setVolume);
	lua_register(L, "getVolume", getVolume);
	lua_register(L, "peakPowerForChannel", peakPowerForChannel);
	lua_register(L, "averagePowerForChannel", averagePowerForChannel);
	}

	#pragma mark - Audio Add On Functions and associated Methods

	// Objective C Methods

	- (void)startPlayer
	{
	[self.player play];
	}

	- (void)stopPlayer
	{
	if ([self.player isPlaying])
	[self.player stop];
	}

	- (void)setPlayerVolume: (int)setting
	{
	// The volume property is the playback gain for the AV audio player object,
	// it expects a float ranging from 0.0 through 1.0.
	//
	// Our Codea slider control returns an integer from 0 to 100 so we need to
	// convert this to a float in the appropriate range before applying it to
	// our player. As a defensive measure we will clamp the result between 0.0 and 1.0.

	float floatSetting = MAX(0.0f, MIN((float)setting / 100.0f, 1.0f));

	[self.player setVolume: floatSetting];
	}

	- (int)getPlayerVolume
	{
	return (self.player.volume * 100.0f);
	}

	- (int)getPeakPower: (NSUInteger)channel
	{
	if ([self.player isPlaying])
	{
	// Refresh the average and peak power values for all channels of our audio player.

	[self.player updateMeters];

	// Peak power is a floating-point representation, in decibels, of a given audio channel’s current peak power.
	// A return value of 0 dB indicates full scale, or maximum power while a return value of -160 dB indicates
	// minimum power (that is, near silence).
	//
	// If the signal provided to the audio player exceeds ±full scale, then the return value may exceed 0
	// (that is, it may enter the positive range).
	//
	// Channel numbers are zero-indexed. A monaural signal, or the left channel of a stereo signal, has channel number 0.

	float power = -160.0f; // Initialise to silence

	if (channel <= [self.player numberOfChannels])
	power = [self.player peakPowerForChannel: channel];

	// Our dial is expecting a value between 0 and 100.

	if (power >= 0)
	return 100;
	else
	{
	power += 160.0f; // power is now a +ve float between 0 and 160
	power = (power / 160.0f) * 100.0f; // change to a percentage
	return (int)power;
	}
	}
	else
	return 0;
	}

	- (int)getAveragePower: (NSUInteger)channel
	{
	if ([self.player isPlaying])
	{
	// Refresh the average and peak power values for all channels of our audio player.

	[self.player updateMeters];

	// A floating-point representation, in decibels, of a given audio channel’s current average power.
	// A return value of 0 dB indicates full scale, or maximum power; a return value of -160 dB indicates
	// minimum power (that is, near silence).
	//
	// If the signal provided to the audio player exceeds ±full scale, then the return value may exceed 0
	// (that is, it may enter the positive range).
	//
	// Channel numbers are zero-indexed. A monaural signal, or the left channel of a stereo signal, has channel number 0.

	float power = -160.0f; // Initialise to silence

	if (channel <= [self.player numberOfChannels])
	power = [self.player averagePowerForChannel: channel];

	// Our dial is expecting a value between 0 and 100.

	if (power >= 0)
	return 100;
	else
	{
	power += 160.0f; // power is now a +ve float between 0 and 160
	power = (power / 160.0f) * 100.0f; // change to a percentage
	return (int)power;
	}
	}
	else
	return 0;
	}

	// C Functions
	//
	// Note that the returned value from all exported Lua functions is how many values that function should return in Lua.
	// For example, if you return 0 from that function, you are telling Lua that peakPowerForPlayer (for example) returns 0 values.
	// If you return 2, you are telling Lua to expect 2 values on the stack when the function returns.
	//
	// To actually return values, you need to push them onto the Lua stack and then return the number of values you pushed on.

	static int playMusic(struct lua_State *state)
	{
	[audioAddOnInstance startPlayer];
	return 0;
	}

	static int stopMusic(struct lua_State *state)
	{
	[audioAddOnInstance stopPlayer];
	return 0;
	}

	static int getVolume(struct lua_State *state)
	{
	// Push the integer volume onto the Lua stack

	lua_pushinteger(state, [audioAddOnInstance getPlayerVolume]);

	// Our function returns 1 value = volume

	return 1;
	}

	static int setVolume(struct lua_State *state)
	{
	[audioAddOnInstance setPlayerVolume: lua_tonumber(state, 1)];
	return 0;
	}

	static int peakPowerForChannel(struct lua_State *state)
	{
	// Channel numbers are zero-indexed. A monaural signal,
	// or the left channel of a stereo signal, has channel number 0.

	NSUInteger channel = lua_tonumber(state, 1);

	// Push the integer power onto the Lua stack

	lua_pushinteger(state, [audioAddOnInstance getPeakPower: channel]);

	// Our function returns 1 value = peak power

	return 1;
	}

	static int averagePowerForChannel(struct lua_State *state)
	{
	// Channel numbers are zero-indexed. A monaural signal,
	// or the left channel of a stereo signal, has channel number 0.

	NSUInteger channel = lua_tonumber(state, 1);

	// Push the integer power onto the Lua stack

	lua_pushinteger(state, [audioAddOnInstance getAveragePower: channel]);

	// Our function returns 1 value = peak power

	return 1;
	}

	#pragma mark - AVAudioPlayer Delegate

	// These Audio Player call back methods are not used in this tutorial but provided here
	// for information. There are a number of other delegate methods available. Check the
	// documentation.

	- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
	{

	}

	- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer )player error:(NSError )error
	{
	NSLog(@"Error decoding audio file: %@", [error localizedDescription]);
	}

	-(void)audioPlayerBeginInterruption:(AVAudioPlayer *)player
	{

	}

	-(void)audioPlayerEndInterruption:(AVAudioPlayer *)player
	{

	}

	@end

view raw AudioAddOn.m hosted with ❤ by GitHub

	//
	// GameCenterAddOn.h
	// AudioDemo
	//
	// Created by David Such on 25/04/13.
	// Copyright (c) 2013 Reefwing Software. All rights reserved.
	//
	// Version: 1.0 - Original (25/04/13)

	#import "CodeaAddon.h"
	#import <Foundation/Foundation.h>
	#import <GameKit/GameKit.h>

	// Create a variable which points to the instance of this class so that we can access self
	// from within the Lua c functions.

	id gameCenterAddOnInstance;

	// This class conforms to the CodeaAddon, GKLeaderboardViewControllerDelegate, and GKAchievementViewControllerDelegate Protocols
	// We don't use GKGameCenterViewController since this is only available for iOS 6, and we want to provide this functionality for
	// 1st generation iPads which run iOS 5.

	@interface GameCenterAddOn : NSObject<CodeaAddon, GKLeaderboardViewControllerDelegate, GKAchievementViewControllerDelegate>
	{
	bool hasGameCenter;
	}

	@property (weak, nonatomic) CodeaViewController *codeaViewController;

	// Forward declare our Lua Audio functions. These are static to confine their scope
	// to this file. By default c functions are global.

	static int gameCenterStart(struct lua_State *state);
	static int showLeaderBoardWithIdentifier(struct lua_State *state);
	static int showAchievementsView(struct lua_State *state);
	static int playerIsAuthenticated(struct lua_State *state);

	@end

view raw GameCenterAddOn.h hosted with ❤ by GitHub

	//
	// GameCenterAddOn.m
	// AudioDemo
	//
	// Created by David Such on 25/04/13.
	// Copyright (c) 2013 MyCompany. All rights reserved.
	//

	#import "lua.h"
	#import "GameCenterAddOn.h"

	@implementation GameCenterAddOn

	#pragma mark - Initialisation

	- (id)init
	{
	self = [super init];
	if (self)
	{
	// gameCenterAddOnInstance allows us to access self from within the c functions.

	gameCenterAddOnInstance = self;

	// Initialise our Instance Variables

	hasGameCenter = false;
	}
	return self;
	}

	#pragma mark - CodeaAddon Delegate

	// Classes which comply with the <CodeaAddon> Protocol must implement this method

	- (void)codea:(CodeaViewController)controller didCreateLuaState:(struct lua_State)L
	{
	NSLog(@"gameCenterAddOn Registering Functions");

	// Register the iAd functions, defined below

	lua_register(L, "gameCenterStart", gameCenterStart);
	lua_register(L, "showLeaderBoardWithIdentifier", showLeaderBoardWithIdentifier);
	lua_register(L, "showAchievementsView", showAchievementsView);
	lua_register(L, "playerIsAuthenticated", playerIsAuthenticated);

	// Hook up with the CodeaViewController - don't try to add subviews in this method.

	self.codeaViewController = controller;
	}

	#pragma mark - Game Center Add On Instance Methods

	- (BOOL)isGameCenterAvailable
	{
	// Check for presence of GKLocalPlayer API.

	Class gcClass = (NSClassFromString(@"GKLocalPlayer"));

	// The device must be running running iOS 4.1 or later.

	NSString *reqSysVer = @"4.1";
	NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
	BOOL osVersionSupported = ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending);

	if (gcClass && osVersionSupported)
	NSLog(@"Game Center is Available");
	else
	NSLog(@"Game Center is not Available");

	return (gcClass && osVersionSupported);
	}

	- (void)registerForAuthenticationNotification
	{
	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
	[nc addObserver: self selector: @selector(authenticationChanged) name: GKPlayerAuthenticationDidChangeNotificationName object: nil];
	}

	// Your game must authenticate a local player before you can use any Game Center classes.
	// If there is no authenticated player, your game receives a GKErrorNotAuthenticated error.

	- (bool)isPlayerAuthenticated
	{
	return hasGameCenter;
	}

	- (void)authenticateLocalPlayer
	{

	if(![self isGameCenterAvailable])
	{
	hasGameCenter = false;
	return;
	}

	[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error)
	{
	if (error == nil)
	{
	[self registerForAuthenticationNotification];
	hasGameCenter = true;
	NSLog(@"Game Center - local player authenticated.");
	}
	else
	{
	hasGameCenter = false;
	NSLog(@"Game Center - failed to authenticate, error: %@", [error localizedDescription]);
	}
	}];
	}

	- (void)authenticationChanged
	{
	if([self isGameCenterAvailable])
	{
	return;
	}

	if ([GKLocalPlayer localPlayer].isAuthenticated)
	{
	hasGameCenter = true;
	}
	else
	{
	hasGameCenter = false;
	}
	}

	#pragma mark - Game Center C Functions

	// C Functions
	//
	// Note that the returned value from all exported Lua functions is how many values that function should return in Lua.
	// For example, if you return 0 from that function, you are telling Lua that function returns 0 values.
	// If you return 2, you are telling Lua to expect 2 values on the stack when the function returns.
	//
	// To actually return values, you need to push them onto the Lua stack and then return the number of values you pushed on.

	static int gameCenterStart(struct lua_State *state)
	{
	[gameCenterAddOnInstance authenticateLocalPlayer];

	return 0;
	}

	static int showLeaderBoardWithIdentifier(struct lua_State *state)
	{
	[gameCenterAddOnInstance showLeaderboard: lua_tonumber(state, 1)];

	return 0;
	}

	static int showAchievementsView(struct lua_State *state)
	{
	[gameCenterAddOnInstance showAchievements];

	return 0;
	}

	static int playerIsAuthenticated(struct lua_State *state)
	{
	lua_pushboolean(state, [gameCenterAddOnInstance isPlayerAuthenticated]);

	return 1;
	}

	#pragma mark - GKLeaderboardViewControllerDelegate Methods

	- (void)showLeaderboard: (int)ident
	{
	NSString *identifier;

	// INSERT YOUR ACHIEVEMENT IDENTIFIERS BELOW - These are set up in iTunes Connect

	switch (ident)
	{
	case 1:
	identifier = @"Easy Difficulty";
	break;
	case 2:
	identifier = @"Medium Difficulty";
	break;
	case 3:
	identifier = @"Hard Difficulty";
	break;
	default:
	NSLog(@"Warning Unknown Leader Board");
	break;
	}

	GKLeaderboardViewController *leaderBoardCont = [[GKLeaderboardViewController alloc] init];

	if (leaderBoardCont)
	{
	leaderBoardCont.category=identifier;
	leaderBoardCont.timeScope=GKLeaderboardTimeScopeToday;
	leaderBoardCont.leaderboardDelegate=self;
	self.codeaViewController.paused = YES;
	[self.codeaViewController presentModalViewController: leaderBoardCont animated: YES];
	}
	}

	- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
	{
	// Dismiss the Game Center Leader Board view

	[self.codeaViewController dismissViewControllerAnimated: YES completion:^
	{
	self.codeaViewController.paused = NO; // Unpause Codea
	}];
	}

	#pragma mark - GKAchievementViewControllerDelegate Methods

	- (void)showAchievements
	{
	GKAchievementViewController *achievements = [[GKAchievementViewController alloc] init];

	if (achievements != nil)
	{
	achievements.achievementDelegate = self;
	self.codeaViewController.paused = YES;
	[self.codeaViewController presentViewController: achievements animated: YES completion: nil];
	}
	}

	- (void)achievementViewControllerDidFinish:(GKAchievementViewController *)viewController
	{
	// Dismiss the Game Center Achievement view

	[self.codeaViewController dismissViewControllerAnimated: YES completion:^
	{
	self.codeaViewController.paused = NO; // Unpause Codea
	}];
	}

	@end

view raw GameCenterAddOn.m hosted with ❤ by GitHub

	//
	// IAdsAddOn.m
	// AudioDemo
	//
	// Created by David Such on 19/04/13.
	// Copyright (c) 2013 Reefwing Software. All rights reserved.
	//
	// Version: 1.0 - Original (19/04/13)
	// 1.1 - Minor refactoring (25/4/13)

	#import "lua.h"
	#import "IAdsAddOn.h"

	@implementation IAdsAddOn

	#pragma mark - Initialisation

	- (id)init
	{
	self = [super init];
	if (self)
	{
	// audioAddOnInstance allows us to access self from within the c functions.

	iAdsAddOnInstance = self;

	// Initialise our Instance Variables

	_isBannerVisible = NO;
	_showBannerFromTop = YES;

	// Initialise our iAd Banner View

	CGRect frame = CGRectZero;
	frame.size = [ADBannerView sizeFromBannerContentSizeIdentifier: ADBannerContentSizeIdentifierPortrait];

	_bannerView = [[ADBannerView alloc] initWithFrame: frame];
	_bannerView.requiredContentSizeIdentifiers = [NSSet setWithObject: ADBannerContentSizeIdentifierPortrait];
	_bannerView.delegate = self;
	}
	return self;
	}

	#pragma mark - CodeaAddon Delegate

	// Classes which comply with the <CodeaAddon> Protocol must implement this method

	- (void) codea:(CodeaViewController)controller didCreateLuaState:(struct lua_State)L
	{
	NSLog(@"iAdAddOn Registering Functions");

	// Register the iAd functions, defined below

	lua_register(L, "showAdFromTop", showAdFromTop);
	lua_register(L, "showAdFromBottom", showAdFromBottom);
	lua_register(L, "hideAd", hideAd);

	// Hook up with the CodeaViewController - don't try to add subviews in this method.

	self.codeaViewController = controller;
	}

	#pragma mark - iAds Add On Functions and associated Methods

	// Objective C Methods

	- (void)showBannerViewAnimated:(BOOL)animated
	{
	if ([self.bannerView isBannerLoaded])
	{
	// We only display the banner View if it has ads loaded and isn't already visible.
	// Set the banner view starting position as off screen.

	CGRect frame = _bannerView.frame;

	if (_showBannerFromTop)
	frame.origin.y = 0.0f - _bannerView.frame.size.height;
	else
	frame.origin.y = CGRectGetMaxY(self.codeaViewController.view.bounds);

	_bannerView.frame = frame;

	// Set banner View final position to animate to.

	if (_showBannerFromTop)
	frame.origin.y = 0;
	else
	frame.origin.y -= frame.size.height;

	if (animated)
	[UIView animateWithDuration: 0.5 animations: ^{self.bannerView.frame = frame;}];
	else
	self.bannerView.frame = frame;

	_isBannerVisible = YES;
	}
	else
	NSLog(@"showBannerViewAnimated: Unable to display banner, no Ads loaded.");
	}

	- (void)hideBannerViewAnimated:(BOOL)animated
	{
	if (_isBannerVisible)
	{
	CGRect frame = self.bannerView.frame;

	if (_showBannerFromTop)
	frame.origin.y -= frame.size.height;
	else
	frame.origin.y = CGRectGetMaxY(self.codeaViewController.view.bounds);

	if (animated)
	[UIView animateWithDuration: 0.5 animations: ^{self.bannerView.frame = frame;}];
	else
	self.bannerView.frame = frame;

	_isBannerVisible = NO;
	}
	}

	// C Functions
	//
	// Note that the returned value from all exported Lua functions is how many values that function should return in Lua.
	// For example, if you return 0 from that function, you are telling Lua that function returns 0 values.
	// If you return 2, you are telling Lua to expect 2 values on the stack when the function returns.
	//
	// To actually return values, you need to push them onto the Lua stack and then return the number of values you pushed on.

	static int showAdFromTop(struct lua_State *state)
	{
	[iAdsAddOnInstance setShowBannerFromTop: YES];
	[iAdsAddOnInstance showBannerViewAnimated: YES];

	return 0;
	}

	static int showAdFromBottom(struct lua_State *state)
	{
	[iAdsAddOnInstance setShowBannerFromTop: NO];
	[iAdsAddOnInstance showBannerViewAnimated: YES];

	return 0;
	}

	static int hideAd(struct lua_State *state)
	{
	[iAdsAddOnInstance hideBannerViewAnimated: YES];

	return 0;
	}

	#pragma mark - iAd Banner View Delegate

	// Your application implements this method to be notified when a new advertisement is ready for display.

	- (void)bannerViewDidLoadAd:(ADBannerView *)banner
	{
	NSLog(@"Banner View loaded Ads for display.");
	NSLog(@"Active View Controller: %@", self.codeaViewController.class);

	// Add our banner view to the CodeaViewController view, if we haven't already.

	if (![self.codeaViewController.view.subviews containsObject: _bannerView])
	[self.codeaViewController.view addSubview: _bannerView];

	[self showBannerViewAnimated: YES];
	}

	// This method is triggered when an advertisement could not be loaded from the iAds system
	// (perhaps due to a network connectivity issue).

	- (void)bannerView:(ADBannerView )banner didFailToReceiveAdWithError:(NSError )error
	{
	NSLog(@"bannerview failed to receive iAd error: %@", [error localizedDescription]);

	[self hideBannerViewAnimated: YES];
	}

	// This method is triggered when the banner confirms that an advertisement is available but before the ad is
	// downloaded to the device and is ready for presentation to the user.

	- (void)bannerViewWillLoadAd:(ADBannerView *)banner
	{

	}

	// This method is triggered when the user touches the iAds banner in your application. If the willLeave argument
	// passed through to the method is YES then your application will be placed into the background while the user is
	// taken elsewhere to interact with or view the ad. If the argument is NO then the ad will be superimposed over your
	// running application.

	- (BOOL)bannerViewActionShouldBegin:(ADBannerView *)banner willLeaveApplication:(BOOL)willLeave
	{
	self.codeaViewController.paused = YES;
	NSLog(@"Ad being displayed - Codea paused.");

	return YES;
	}

	// This method is called when the ad view removes the ad content currently obscuring the application interface.
	// If the application was paused during the ad view session this method can be used to resume activity.

	- (void)bannerViewActionDidFinish:(ADBannerView *)banner
	{
	self.codeaViewController.paused = NO;
	NSLog(@"Ad dismissed - Codea running.");
	}

	@end

view raw iAddsAddOn.m hosted with ❤ by GitHub

	//
	// IAdsAddOn.h
	// AudioDemo
	//
	// Created by David Such on 19/04/13.
	// Copyright (c) 2013 Reefwing Software. All rights reserved.
	//
	// Version: 1.0 - Original (19/04/13)
	// 1.1 - Minor refactoring (25/4/13)

	#import "CodeaAddon.h"
	#import <iAd/iAd.h>
	#import <Foundation/Foundation.h>

	// Device Detection Macros - can be used to position the banner advertisement based on device.
	// Not used in this tutorial.

	//#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
	//#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
	//#define IS_IPHONE_5 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 568.0f)
	//#define IS_IPHONE_4 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 480.0f)

	// Create a variable which points to the instance of this class so that we can access self
	// from within the Lua c functions.

	id iAdsAddOnInstance;

	// This class conforms to the CodeaAddon & ADBannerViewDelegate Protocols

	@interface IAdsAddOn : NSObject<CodeaAddon, ADBannerViewDelegate>

	@property BOOL isBannerVisible;
	@property BOOL showBannerFromTop;
	@property (strong, nonatomic) ADBannerView *bannerView;
	@property (weak, nonatomic) CodeaViewController *codeaViewController;

	// Forward declare our Lua iAd functions. These are static to confine their scope
	// to this file. By default c functions are global.

	static int showAdFromTop(struct lua_State *state);
	static int showAdFromBottom(struct lua_State *state);
	static int hideAd(struct lua_State *state);

	@end

view raw iAdsAddOn.h hosted with ❤ by GitHub

	-- AudioDemo
	-- Main.lua

	-- Uses Cider Controls v1.6 from @Mark and @aciolino
	-- make sure you add this as a Dependency


	function setup()

	displayMode(FULLSCREEN)
	setInstructionLimit(0)
	ctlFrame = Control("Audio Player", 20, HEIGHT - 600, 450, HEIGHT - 20)
	ctlFrame.background = color(181, 141, 203, 255)
	ctlFrame.textAlign = CENTER
	ctlFrame.fontSize = 24

	-- Initialise the Cider Controls

	playBtn = TextButton("Play", 70, 480, 225, 520)
	stopBtn = TextButton("Stop", 245, 480, 400, 520)
	sldVolume = Slider("Volume Control", 70, HEIGHT - 450, 400, HEIGHT - 420, 0, 100, 50)

	-- Initialise the Cider Volume Indicators

	dial = Dial("Left", 70, 780, 220, 930, 0, 100, 0)
	doughnut = Doughnut("Right", 250, 780, 400, 930, 0, 100, sldVolume.val)
	doughnut.intervals = 25
	doughnut.warm = 9
	doughnut.hot = 13

	-- Show Banner Ad using iAdsAddOn

	showAdFromTop()

	-- Start Game Center using gameCenterAddOn

	gameCenterStart()

	end

	function draw()

	-- This sets a dark background color

	background(178, 173, 173, 255)

	-- Draw the Cider Controls

	ctlFrame:draw()
	playBtn:draw()
	stopBtn:draw()
	sldVolume:draw()
	dial:draw()
	doughnut:draw()

	-- Update the dB Meter Dials
	--
	-- The iPad should have 2 channels, left = 0 and right = 1

	dial.val = averagePowerForChannel(0) or 0
	doughnut.val = averagePowerForChannel(1) or 0

	end

	function touched(touch)

	if sldVolume: touched(touch) then
	-- call AudioAddOn function
	setVolume(sldVolume.val)
	end

	if playBtn:touched(touch) then
	-- call AudioAddOn and iAdsAddOn function
	playMusic()
	hideAd()
	if playerIsAuthenticated() then
	showAchievementsView()
	else
	print("Player not authenticated")
	end
	end

	if stopBtn:touched(touch) then
	-- call AudioAddOn and iAdsAddOn function
	stopMusic()
	showAdFromBottom()
	if playerIsAuthenticated() then
	showLeaderBoardWithIdentifier(1)
	else
	print("Player not authenticated")
	end
	end

	end

view raw Main.lua hosted with ❤ by GitHub

Codea Tutorials

Contents

Thursday, April 25, 2013

Tutorial 30 - Codea v1.5.2: Objective C Add On, Game Center