I put together a tutorial for integrating Game Center with the BT quiz. Note, this is only for iOS. I have not submitted a final app to iTunes yet, so there may be some issues I'm not aware of at this point. I've got it working well in two apps, and I'll submit them to Apple soon. If any adjustments need to be made, I'll correct and let you know. Please let me know if you have any problems or if you find typos, etc. Jeff http://www.jc-evans.com/uploads/Game_Center_Tutorial.pdf

This tutorial and the song I was listening to while reading are what just gave me my second app idea! I'm not even kidding! Thanks :D Edit: Great tutorial too by the way. the screenshots make it so much easier to see what you're doing. Now how can I add custom achievements to the app?

A lot of the info I got was from these two tutorials. They helped a lot. You can implement the achievements, and they work. Just need to add some code and do a little more set up in iTunes Connect. http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-game-center-achievements-and-leaderboards-part-1/ http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-game-center-achievements-and-leaderboards-part-2/

@MGoBlue's awesome tutorial is also added to the How To's page. Good stuff.

@MGoBlue Nice tutorial!

This is amazing!! Loved your urban airship tutorial and this Game Center Tutorial was exactly what I was looking for in a project I abandoned a couple months ago. Gonna try to implement this! Can't wait to see what you do next! ;)

@MGoBlue, I've gone through the whole tutorial. I get errors on one file the viewcontroller.h Take a look at the screenshot. All of the other code seems fine. What am I doing wrong here! http://dl.dropbox.com/u/5432778/Screen%20Shot%202011-12-31%20at%2012.56.30%20PM.png

@mitchellapps -- without having tested it yet. looks like you should have space in the viewcontroller.h after { ... GameCenterManagerDelegate> { perhaps?

Looks like you're missing a comma after AdBannerViewDel. That should fix it.

Apparently a couple of my screenshot graphics were cut off. I've fixed that and corrected a couple of minor typos. New file is uploaded on my server. http://www.jc-evans.com/uploads/Game_Center_Tutorial.pdf

Ok, fixed that and I noticed that anything with quotes copied straight from your pdf caused errors so I fixed that. The app now builds, but Game Center says that this game is not recognized by Game Center. I missed a vital step somewhere. The kLeaderID is the ID we setup on itunes connect right? Is there somewhere else I should have place info?

Interesting about the quotes. My layout program obviously changed everything to smart quotes which don't work. I'll have to find a way to fix that. As for the kLeaderID, it is the 'Leaderboard ID' you set up at the beginning. Also, make sure your Bundle ID matches what you set up in iTunes Connect. Also, did you remember to enable Game Center for the current version of your app? (button changes to green once enabled).

Ok, yes, forgot to enable. Now we are cooking. 2 new issues for you. On my submit score button it says quizSubmitScore and when I tap that it shows Game Center with my app name and all but doesn't submit the score. When I tap show scoreboard the score I tried to submit is not there. How do I change the name of my button from quizSubmitScore and how to I ensure that my scores are being submitted?

Here are screenshots be better show what I'm talking about http://dl.dropbox.com/u/5432778/submit.png and http://dl.dropbox.com/u/5432778/leaderboard.png

For the button name, you missed this step: 6. Select the Localizable.strings file. It’s located in the BT_Config folder. Add the following under the //quiz section: quizSubmitScore = Submit Score; The score should be submitting. It doesn't show immediately. Don't know if that's a bug or how it's supposed to work. If you look at the scoreboard and click on one of the options (Today, This Week, All Time) and it should refresh and show the score.

Make sure to include the quote marks around quizSubmitScore and Submit Score.

It looks like what is going on is when I tap quizsubmitscore it takes me to the leaderboard rather than submits my score.

I think there maybe some incorrect quotes that I may have missed fixing. Your probably right. I'll get back to you

You won't receive a message confirming that your score is submitted. That's why I added the routine to open the leaderboard after you submit the score. I just fixed the tutorial to get rid of the smart quotes.

Ok. Button correctly says Submit Score. I still don't think the score is submitting. When you tap Show Scoreboard it states that there are no scores.

If does take time to show up, I'll give a few hours. I've submitted multiple scores so hopefully they show up soon. I need a break anyway. Xcode makes my eyes hurt

I just remembered that I was having the same issue. When I googled it I found a forum post that said that Game Center won't show scores until there are more than one. I created another Game Center ID from my iPad and posted a score from that, then both scores showed up. I don't know if this is a Game Center bug, or something that's intentional. Check this thread out (see the last comment): http://www.iphonedevsdk.com/forum/iphone-sdk-development/92622-problem-score-reporting-game-center.html

Thanks! I'll check this out tomorrow and let you know! I appreciate everything!

Thanks Jeff. Happy New Year!

@MGoBlue Alright, I created a separate Game Center Account on my iPad! Worked like a charm!!! Awesome tutorial!! I have a question though. I have multiple quiz categories that I'm doing in my app and was wondering if you knew a way to make a leaderboard for each category? That would be cool. Not sure if you've tried that. And oh yes, Happy New Year!

@mitchellapps - glad you got it working. I'm actually trying to tackle the multiple leaderboard question right now. I also have a quiz app with different quiz categories. I'll let you know if I get it worked out.

@MGoBlue Sounds Good! Thanks again!

@mitchellapps - OK. I've got multiple leaderboards working. Not sure if this is the most efficient way or if it will cause other issues, but in my testing it seems to work fine. First, set up several leaderboards in iTunes Connect. Then, in Buzztouch, modify the Screen Nickname of each quiz to match the corresponding LeaderboardID. In Xcode, make the following modifications: BT_screen_quiz.h Add the following at the end of the @property statements: @property (nonatomic, retain) NSString *itemNickname; BT_screen_quiz.m Under quiz properties */ change the last line to this: @synthesize quizButtonFontSizeSmallDevice, quizButtonFontSizeLargeDevice, finishedButtons, itemNickname; Replace the //submit score and //show scoreboard sections with the following: //submit score -(void)submitScore{ NSString *itemNickname = [BT_strings getJsonPropertyValue:screenData.jsonVars:@itemNickname:@]; self.currentLeaderBoard = itemNickname; if(totalPoints > 0) { [self.gameCenterManager reportScore: totalPoints forCategory: self.currentLeaderBoard]; } GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != NULL) { leaderboardController.category = self.currentLeaderBoard; leaderboardController.timeScope = GKLeaderboardTimeScopeWeek; leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } } //show scoreboard -(void)showScoreboard{ NSString *itemNickname = [BT_strings getJsonPropertyValue:screenData.jsonVars:@itemNickname:@]; self.currentLeaderBoard = itemNickname; GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != NULL) { leaderboardController.category = self.currentLeaderBoard; leaderboardController.timeScope = GKLeaderboardTimeScopeWeek; leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } } It's working for me. Let me know how it goes for you. Thanks.

Strike that. Working on simulator but won't compile. More to do.....

Bummer! You had me excited! Lol! You'll figure it out! Your brilliant!

@MGoBlue You around? Got push working this morning and trying to implement game center per your PDF. Getting multiple errors in BT_viewController.m Back to troubleshooting.

@MacApple, what errors? I noticed when you copy/paste one section of code into BT_screen_quiz.m, it splits words leading to errors. If you want to email me direct, it may be easier. I don't get emails when people post to the thread for some reason. jeff at jc-evans.com @mitchellapps - It looks like I got it working great thanks to some advice from David Book. I'll update the pdf and post later today.

You should have mail! Dollars coming your way, as soon as I dry them out!

Sounds great! Awesome job to you and David!

does this work on 1.5? should be able to auto submit scores with the end quiz fuction

users that which to have to auto submit scores at the end of the quiz without the user clicking submit do the following Remove //Submit Score Button [finishedButtons addObject:NSLocalizedString(@quizSubmitScore, @Submit Score)]; and add at //quizEnded //quizEnded -(void)quizEnded{ [BT_debugger showIt:self:@quizEnded]; [self.gameCenterManager reportScore: totalPoints forCategory: self.currentLeaderBoard];

Thanks MGoBlue again for the tutorial. I updated an app with this gamecenter code and it was approved today..Scores are coming in!!

Great tutorial MGoBlue, thank you! I tried to get the achievement working, got no error i the code but I made some mistakes and the achievement are not showing as achieved in game center. Did you have them working? I'll try the multiple leaderboard tonight.

@MGoBlue - First of all awesome tutorial! I have a weird issue - no matter how I try I get a following error: submitScore undeclared (first use in function) Any pointers? BR/Stefan

@MGoBlue - never mind. I did manage to fix that error. BR/Stefan

@Stefan - Glad you got it working. Unfortunately, I don't get email notifications when threads in the BT Forum are updated, so I have to remember to check back occasionally. Hence the slow replies sometimes. Happy its working for you. @Kahuna - I haven't tried achievements yet, but someone got it working and there's a tutorial in the BT help center. @aussiedra - Is that working for you? I'm going to give the code a try.

@MGoBlue I have followed all the step and when i reached the following one i got the following code error in Xcode if (leaderboardController != NULL) { leaderboardController.category = self.currentLeaderBoard; ----------------------expected expression leaderboardController.timeScope = GKLeaderboardTimeScopeWeek; leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; am i missing something here or is it a pdf copy-paste errors? thanks for any help.

@MGoBlue: I also followed your tutorial but I did something wrong. It's a different issue than @Wissam's. Could you help me? My email is clevelandcib [at] aim.com

@wissam, I had the same issue. I think it's where you copy and paste. What I did was....click at the beginning of the second leaderboardController and then press delete all the way back to the ; Then press enter to send it to a new line Repeat that for each line and it seemed to correct the code Worked for me

@shak77 How about telling us what your issue is? We may be able to help ;)

@bonzo: I get the error "Semantic Issue: 'gameCenterManager' not found on object of type 'BT_screen_quiz*'; did you mean 'gameCenterManager'?" It's on the following line of code in the BT_screen_quiz.m: [self.gameCenterManager reportScore: totalPoints forCategory: self.currentLeaderBoard]; Any idea what I did wrong?

Sorry made a typo. After the error it says "did you mean 'gameCenterMangager'?" not "Manager"

Did you copy and paste from the PDF or type it yourself. I would do a search against your whole project. Do a 'find' from the 'edit' menu and search for mangager. If it finds it, change them all to manager.

Searched through and found that I had a typo that had "mangager" in it. I changed it to "manager" and now I have 2 errors. One of them is the same as before. The other says "Semantic Issue: use of undeclared identifier 'KLeaderboardID'; did you mean 'GKLeaderboard'?

I think the best thing to do is step though the guide again to Mae sur you typed it all correctly. Your safer bet is to copy and paste and then fix the issues with the " as yet don't copy well from the PDF.

I used the newer version that @MGoBlue has on his website so all the quotations are right and I did a full project search for anywhere that it says "mangager" and nothing came up.

for the semantic issue i think you are missing some { or } in the area that the error appears. double check your code matches the PDF

Checked it. Everything seems to match. Question about the kleaderboard thing- Do I replace the "kleaderboardID" part in the line of code that says: "self.currentLeaderBoard = kLeaderboardID;" with my game center id for the app?

no. that stays as it is. you only put your leaderboardID in the appspecificvalues.h file #define kLeaderboardID @"YOUR LEADERBOARDID"

Okay I did that. Should I just change the "gamecentermanager" to "gamecentermangager"? Will it mess everything up?

if you like, copy the complete text in bt_viewcontroller.h bt_viewcontroller.m lcalizable.string bt_screen_quiz.h bt_screen_quiz.m intonotepad or worddoc and then upload them somewhere where i can download, or email them to randalsp at sky dot com and i'lltake a look at them

also your appspecificvalues.h

That'd be great! Thanks. I'll put it together now.

Just sent it.

sent you 2 mails back with typo's i found

@MGoBLue Thanks for the great tutorial. I wonder if you get the multiple scoreboard to work? Do you have any pdf for that to?