Updated personalization options within SwiftKey version 4.4.5 allow the app to collect typographical data from Google+ public posts and Evernote archives, much in the same way as Google’s most recent Keyboard release.
But when I am creating content, like writing, I usually use my iPad Air, and what many Android users doesn't know is that the iOS keyboard learns how to type too, and can predict words and autocorrections very good too. Even most iOS users doesn't know how good it is. If you type a word wrong just keep typing and the keyboard will autocorrect your words, even words you typed wrong in the beginning of the sentence! Quite incredible really. But most users just stop typing when the first word gets wrong and corrects it manually instead. But as I said, that's not necessary.
Another awesome feature with the iOS keyboard is the support for keyboard shortcuts. I have thousands of them, and they syncs with all your devices, even your Mac's. So you can create your shortcuts on your Mac and they show up automatically on your iOS devices. That means that you can very easy create very advanced shortcuts with quite large snippets of text and code. I have done a lot with links to my web pages and blog posts for example. And some with marked up code ready to be posted in your blog posts.
So I really don't miss Swiftkey or Swype on ios.