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I was trying to make a multiplayer Pong iOS app and ended up with this. It is almost good, except for one big bug. The 2nd player's paddle is moving the same way with yours. Basically, you're playing solo with a multiplayer score. I've struggled to see where I've failed, but without success.

the .m: https://gist.github.com/4682875 the .h: https://gist.github.com/4682903

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closed as off topic by palacsint, vikingosegundo, Brian Reichle, Yuushi, Glenn Rogers Feb 4 '13 at 7:40

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This site is a place to get feedback on working code, not a place to find bugs in your code. Also we require code to be contained in your question, not a link to an external source. –  sepp2k Feb 4 '13 at 14:00
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1 Answer 1

up vote 2 down vote accepted

I believe you've got an error here:

    NSData *data3 = [NSData dataWithBytes:gamedata length:(10+sizeof(float))];
    [self mySendDataToPeers:data3];

...you almost certainly want the length to be 10 * sizeof(float) there.

And a minor issue in this method:

- (void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context{

    if(gamedata[2]==1) {
        [data getBytes:gamedata];
        if(gameUniqueID >= gamedata[9]) {
        paddletwox = gamedata[5];
        [self draw];

The [NSData getBytes:] call you are using there was deprecated in iOS 4.0. You should prefer using [NSData getBytes:length:] instead.

Not sure if fixing the first issue will fix the problem of the paddles moving incorrectly, but it's something to start with, at least.

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that damn + was the problem ! I can't believe it and I can't thank you enough :D THANK YOU ! –  Daniel Feb 4 '13 at 8:47
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