How can I detect which system my App Store application is running on?

I am developing a Cocoa Touch application for Apple's App sto开发者_运维百科re and I want to do some tweaking in the code depending on what device it's running on. How can I tell?

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I've used this in a Universal app to determine if the code is running on an iPad

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{
    // Do iPad only stuff here
}

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Check out the documentation for UIDevice

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Look at UIDevice and it's properties. There is a systemVersion string that will work for what you want.