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Next, we need to build the application executable and prepare it to be uploaded.
Select iPhone Device - 3.1.2 (or the current version of the iPhone OS) from the Active SDK pop up, then select it again and pick Distribution. This should set the target to something like “Device - 3.1.2 | Distribution.”
Select Clean All Targets from the Build menu.
Select Build from the Build menu. You may be prompted to allow the application codesign to access your keychain. Allow it to do this so it can sign the app.
Make sure that you didn’t get any errors.
Reveal the app in the Finder (Figure 8-8).
Compress the app into a ZIP archive (Figure 8-9).