I’m wondering if I will have compatibility issues with OS4.0 if my app is built with the 4.1 SDK, or is this a non-issue?
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I’m wondering if I will have compatibility issues with OS4.0 if my app is built with the 4.1 SDK, or is this a non-issue?
The short answer to your question is: Use a Base SDK Version of at least 4.0 for your application and a Deployment Target Version of exactly 4.0.
I’ve downvoted both answers because they are wrong or at least incomplete.
When building applications there are two settings that you should be aware of:
There is the Base SDK Version which defines against which version of the SDK your application will be compiled.
There is also the Deployment Target Version which defines the lowest version of the iOS that your application requires. You can set this to as low as 2.2.1 in Xcode but the App Store will not accept versions lower then 3.1.3 at the moment.
The Base SDK Version can be higher then the Deployment Target Version. This simply means that your application is backward compatible with older version of the iOS. This also means that your app needs to make decisions at runtime to be sure not to use newer functionality when running on an older version.
For example, the
MFMessageComposeViewControllerwas introduced in 4.0 so if your app has been configured to also run on 3.1.3 then you should useNSClassFromString()to find if that specific class is actually available before you use it.There are many questions here on Stack Overflow on how to discover available functionality so I will not repeat those techniques here.