Choose different enum for different Devices

[mavrik5150]

Hello everyone, got a question here since I'm stumped on trying to get it setup. I wanted to see if there's a way to choose a different set of enums when using a different device. Basically what I have is some object movement speeds defined in a "type enum" and if the device is an iPad I want those values doubled since the larger screen has more room. I tried using the UIUserInterfaceIdiom option to check if it's an iPad or not, but I can't seem to figure out how to use those in a if statement to choose a different typedef enum list. I don't know what code to supply, so if you want me to show what I've tried here's what I have below:

 
//Setup Movement Speeds
typedef enum { 
#if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone  
    NormalSpeed = 2, 
    SlowSpeed = 1,
    FastSpeed = 4,
    ConfusedSpeed = -2
#elif UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad
    NormalSpeed = 4, 
    SlowSpeed = 2,
    FastSpeed = 8,
    ConfusedSpeed = -4
#endif
} MovementSpeeds;

This code above doesn't work but is essentially what I'm trying to achieve. I get a "Token [ is not valid in preprocessor expressions" which doesn't really make sense since I'm not using a bracket anywhere but I'm sure it's probably something else that I'm trying to do incorrectly but can't figure out how to fix this. I wanted to do it this way so I don't have to constantly check for device type when changing speeds throughout the level.

[mavrik5150]

Bump, I know this may be a painfully simple answer I just need someone to slap me in the back of the head and let me know where I'm going wrong here. Thanks.

[iAppDev]

are you putting it in the ViewDidLoad section?
so when the app loads, your desired enum for desired device loads.

[iAppDev]

here's a good tut that might get you on the right path

http://www.youtube.com/watch?v=n7aNHzPPmzo

[mavrik5150]

Thanks iApp, I did see that video before but was trying to see if there was any other way besides doing that in viewdidload (or in my case the init method since this is a Cocos2d game). I was declaring this right after the @implementation along with a few other enum's that will be used throughout the code so I thought there was a way to do an if statement to a enum but maybe not. Looks like I may just have to declare all the values as ivars and then do the check in my init for now. Thanks again.

[fiftysixty]

Originally Posted by mavrik5150

Thanks iApp, I did see that video before but was trying to see if there was any other way besides doing that in viewdidload (or in my case the init method since this is a Cocos2d game). I was declaring this right after the @implementation along with a few other enum's that will be used throughout the code so I thought there was a way to do an if statement to a enum but maybe not. Looks like I may just have to declare all the values as ivars and then do the check in my init for now. Thanks again.

The main problem you have now is that you're using preprocessor statements, which by definition happen before the code is compiled. It is impossible to do it the way you're trying: your compiled executable will only contain one set of enums no matter what device it's run on.

Regarding the error message you get, the UI_USER_INTERFACE_IDIOM() is a macro that the preprocessor will expand into actual code to be compiled. So you're basically mixing preprocessor if statements with compiled code, and they don't mix too well.