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I want to make an universal build, but I create my UI entirely programmatically.

1) Can I add my different view controller classes to the device-specific resources directories? Or must classes be shared along both devices?

2) If I must share the classes along both devices, what's the safest way to conditionally load classA or classB depending on if it's an iPhone or iPad device?

openfrog
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    Move your UI into xibs. Managing the differences programmatically just seems like a massive overhead, and as you're already facing a lot of work to support the iPad you may as well take the hit and move the UI definitions to somewhere more manageable. Added as a comment as it doesn't answer your specific question. – dannywartnaby Oct 11 '10 at 08:54
  • +1 for providing the problems that we may face, if we ignore the power of xibs. – RK- Oct 11 '10 at 09:07

2 Answers2

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1) You can not add the view controller classes in two places, because at compile time the same symbol (i.e. class name) will be found in two places and the app will not link.

2) I would say that the safest way would be to have different .xib , but if you want to meke it work just from code, you could create a singleton view manager that only does the correct class loading. Then, in the rest of your code, all you need to do is: [MyViewManager sharedInstance] instantiateViewController:kMyDetailsView] and display the view as you desire.

For determining the current device you can use a statement like this: #define iPad [UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad. It can be included in your prefix file making it available to the whole project.

Mihai Timar
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On every view controller you can do a device check to see which device is running your app and accordingly build your UI. ie, use only one set of view controllers and in the *.m files, in an if-else loop, build your UI accordingly.

Refer to this post to do device checks: Determine device (iPhone, iPod Touch) with iPhone SDK

PS: In your if-else, do an if(iPad){} else{} check as a best practice, since, often times than not, people forget to check for iPod Touch if they do if(iPhone){}else{}

Community
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Sid
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  • By the way this is tried and tested and it works, since I have an app on the app store using this technique :) – Sid Oct 11 '10 at 16:27