问题
I've seen online rumors from before iOS7's release about keyboards opening up.
I haven't found anything in the documentation.
Is it possible to add a custom keyboard, like emoji, to the system, in iOS 7?
回答1:
You cannot add or change the system keyboard. However, you can implement your own custom keyboard inside your app. All you need to do is overwrite UITextField or UITextView and return a custom view for the inputView property.
来源：https://stackoverflow.com/questions/18901340/in-ios7-is-it-possible-to-add-a-custom-keyboard-to-the-system-or-is-it-still-s