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Editorial Team
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Asked: 2026-05-12T14:43:53+00:00

I want to add the MessageUI Framework to my project. The first time I

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I want to add the MessageUI Framework to my project.

The first time I did it, I selected

 /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1sdk/System/Library/Frameworks/MessageUI.framework

After I did that my project would no longer build – lots of syntax errors, and wouldn’t build even after I told Xcode to delete the framework – still had syntax errors, just not quite as many.

So I went back to a back up of the project I’d made just before doing the add – thank goodness I had one – and tried again. This time I selected the MessageUI framework from

 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneOS3.1sdk/System/Library/Frameworks

Now the project builds fine.

I also noticed there was a MessageUI framework in the folder

 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneOS3.0sdk/System/Library/Frameworks

Why would I choose one over the other?

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1 Answer

  1. Editorial Team

    3.1 one is the latest development kit for iPhone OS 3.1 that has to be supported for a submission to the App Store. Anything built using the 3.0 framework may possibly not (but more than likely will) be compatible with iPhone OS 3.1.

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