Xcode 4: My iPhone projects have become Mac OS projects.. and I can't change this

Question

I have two iOS projects that under Xcode 3 built properly and these iPhone been on sale in the app store for some time. After upgrading to Xcode 4, Xcode now thinks these are Ma

Answer 1

You need to change your build settings. Fortunately, this is really easy to do.

Start by clicking on your project's name in the Project Navigator.

Now, click on your Project Name as it comes up in the list. (You may need to do this for your build as well.)

Next, click on Build Settings. Finally, you should be able to change your Base SDK to the appropriate one.

Note that you might need to repeat steps 3 and 4 after selecting your Target in the screen shown below.