Among the great new features in iOS 8 are the custom keyboard extensions, and the keyboard predictive text bar that will sit atop the keyboard (last month I mentioned a component based on that new feature called TOMSSuggestionBar.
Here’s a step-by-step tutorial from Tope Abayomi explaining how to create custom keyboards using the iOS 8 custom keyboard extension.
The tutorial explains how to set up your project, using the new keyboard extension, creating a custom keyboard layout, and explains a few of the gotchas along the way.
Here’s an image showing the custom keyboard that you’ll create in the tutorial:
You can find the tutorial over on the App Design Vault.
A nice guide on using the new iOS 8 custom keyboard extension.