On the topic of having one IDE that just works for multiple languages/platforms, you should check out srclib (https://srclib.org), an open-source language analysis tool (I'm one of the creators) that abstracts away the language-specific parts of IDE support so that IDEs/editor plugins can hook into one API and automatically get support for a bunch of different languages. This way, you don't have to build MxN plugins (M editors, N languages) to support all combos of editors/languages people might want to use.
The currently supported languages are Go, Java, Python, JavaScript, and Ruby, so this wouldn't work yet for iOS, but Objective-C and Swift are high on our priority list. Editor plugins exist for Emacs, Sublime, and Atom. Would love to hear anyone's feedback from trying it out.