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I'm using xcode 4 and making the build for ios4 and ios3.1.3 . I'm able to make the build for ios4 but when i made a build for ios3.1.3 it gives me "signcode error" at the time of sync can any one suggest me the proper way of making the build for ios3.1.3 through xcode 4 . As far as i know entitlements.plist is not required in Xcode 4.

Thanks In Advance

user972990
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You can't build app for iOS 3.* in XCode4, you can however set the deployment target of you project to iOS 3.*.

Setting the deployment target will make your app run on iOS 3., but you will have to make sure that you are not calling nay methods that are not available on iOS 3..

Also user classes introduced in iOS 4 will not work.

rckoenes
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  • I have done this and have created the build but now when im syncing my app then it is giving me the error that "the signer is not valid". What should i do with this error. – user972990 Sep 30 '11 at 13:33
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    My first hit on google: http://stackoverflow.com/questions/1857414/signer-not-valid-error – rckoenes Sep 30 '11 at 14:19
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First you need to set the deployment target to 3.* like rckoenes say.

The second, and more important is set in your target->Build Phases tab->Link Binary With Libraries the framework you need with weak link. This mean configure it from Required to Optional.

This can make you use it in old iOS. Now is obvious you can't use function of new iOS in the older iOS. This mean you can check like respondToSelector or only use function that run in your old iOS.

If you run a function that don't exist in old iOS, it will crash. But, at least, will run until it.

Rodrigo
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