In this chapter, you've learned everything about iMessage apps. This new type of extension, which is very similar to an app, is an exciting, powerful new way for you to integrate your apps further into the iOS ecosystem.

You now know how you can create a sticker pack to provide your users with a fun, refreshing way to share imagery from your app. You saw how to create a standard and custom sticker pack and you even learned how to create interactive experiences that allow your users to compose stickers together by using a messages session and the conversation objects.

Most importantly, you learned that even though iMessage apps can be very complex, they can also be simple. Some iMessage apps will make heavy use of interactive messages, others are simply standard sticker packs, or somewhere in between, like The Daily Quote. The possibilities are endless and you can have a lot of fun with iMessage extensions. Just be aware that during testing you'll only be able to use your extension in the simulator so, unfortunately, you can't surprise your friends by suddenly sending them stickers from a sticker pack you're still developing.

Once you're done creating an awesome sticker pack, skip ahead to the next chapter in which we'll cover Siri and how you can integrate your app with Apple's powerful, voice-activated personal assistant.