Programmatically control iPhone OS versions to enable functions for both OS 3.x and 4 - MFMessageComposeViewController problem

Question

In order to support iPhone OS 3.x and 4.0 I programmatically control MFMessageComposeViewController functionality like this (use it only if the OS version is 4.0 or above):

Answer 1

I was having the same problem, and solved it a different way:

On the Left hand-side of your XCode window,

1. If you scroll down to the Bulls Eye with "Targets" and expand that

2. Expand your

3. < control > + < click > on "Link Binary With Libraries"

4. Choose "Add" --> "Existing Frameworks"

5. Choose "MessageUI.framework" and click on "Add"

That should add the Message UI to your app, tell me if it works.