There are a few things I don't like about Xcode, but as a whole, it is the best totally free option for iOS development. Better yet, it is totally native. I am an amateur developer, and I have really enjoyed working on Xcode. I recommend giving it a try. The documentation is great and there are a lot of really helpful support videos from non-Apple supported persons, just trying to lend a hand.
I started, knowing nothing about Xcode or Swift, and punched out my first iOS app in less than a month. I was extremely nervous, having all my programmer friends telling me that apple was really strict when reviewing applications. I took the precautions of reading through the Apple documentation before hand, shockingly, my first application went through without a hitch and was on the App Store within 48 hours of submission.
I will admit to using an online class to learn the basics, it was very helpful in getting me familiar with the Xcode environment. I can't provide specifics since I don't know how Apple will feel about promoting someone else's work on a review.