Is it possible to create an iPhone app without access to a physical Apple computer?

Sorry for the newbie question.

I know for Android Play Store apps, the Median website generates everything for you.

Is it the same situation for Apple iPhone apps? Or do I need to sign the binaries on a real, physical Apple Mac computer?

I've created the signing stuff for testing Apple iPhone apps and tested the app on my iPhone. How do I do the same for a real app to be delivered to the Apple App Store.