In a surprise move, Google has released a replacment keyboard for iOS that integrates swipe functionality, access to search, emoji and animated gifs. As Google explains it, "Searching and sending stuff on your phone shouldn’t be that difficult. With Gboard, you can search and send all kinds of things—restaurant info, flight times, news articles—right from your keyboard. Anything you’d search on Google, you can search with Gboard. Results appear as cards with the key information front and center, such as the phone number, ratings and hours. With one tap, you can send it to your friend and you keep the conversation going."
I've been using Goard for few days on my iPhone 6S Plus and my iPad and find it to be more versatile than many third-party keyboards including iOS's stock keyboard. If you already like Google services, this one's a no brainer and worth checking out.