We have featured a few nice text editors for iPhone and iPad, but if you like shortcut function, the following iOS app FioWriter may be more suitable for you.
FioWriter is a versatile text editor developed by Han Zhao, and designed for both iPhone and iPad. The iOS app features a powerful shortcut function that allows you to utilize its three function keys on the virtual keyboard and existing keys, you can easily edit your text document including copy, paste, jump, fast scrolling, fine-grained cursor move, autosave, and more, while the customizable extended keyboard tab lets you quickly access those frequently used keys. Moreover, the text editor also features built-in dictionary, word count function, iCloud & Dropbox sync and TextExpander support. Apart from that, multiple fonts and adjustable font size help you avoid aesthetic fatigue.
FioWriter with a size of 5.0 MB is compatible with iPhone (optimized for iPhone 5), iPod touch and iPad running iOS 5.0 or later. The iOS app is free for a limited time at present. If you’re interested, jump to App Store for more details.