Ad Banner Content Size crashes device?

Recently I integrated iADs into my project and while setting the size of the adBannerView to portrait or landscape, I used

 [_adBannerView setCurrentContentSizeIdentifier: ADBannerContentSizeIdentifier480x32];

and

 [_adBannerView setCurrentContentSizeIdentifier: ADBannerContentSizeIdentifier320x50];

This worked on the simulator, but I got warnings that the code was deprecated. So I changed the code to

 [_adBannerView setCurrentContentSizeIdentifier: ADBannerContentSizeIdentifierLandscape];

and

 [_adBannerView setCurrentContentSizeIdentifier: ADBannerContentSizeIdentifierPortrait];

and the warnings went away and i worked fine on my simulator. However, when I tested out my app on my device(iOS 4.1), The GDB gives me a EXC_BAD_ACCESS error. When I switched back to the earlier code(480x32), the app works fine on my device.

So in a nutshell, my device can run apps which use deprecated iAD methods, and crashes when the current iAD methods are used.

Anyone know why? Also, will Apple reject my app if I use deprecated methods?

Thanks

if your device iOS version is less then 4.2, it will crash because there is no declaration for ADBannerContentSizeIdentifierLandscape and ADBannerContentSizeIdentifierPortrait. You can do a check and see what version the iOS device has, and add ADBannerContentSizeIdentifierPortrait and ADBannerContentSizeIdentifierLandscape only if the version is 4.2 or higher, however you can safely use ADBannerContentSizeIdentifier480x32 and ADBannerContentSizeIdentifier320x50.

Here's a sample on how you can do that: Check iPhone iOS Version