As part of Apple's effort to introduce more and more extension points into the iOS ecosystem, iMessage extensions were added in iOS 10. iMessage extensions allow your users to access and share content from your app with their friends right inside the Messages app. This chapter will show you exactly how to create an iMessage extension.
You will learn about two different extension types: Sticker packs and iMessage apps. Note that these extensions are called apps and not just extensions. This is because iMessage extensions behave a lot like apps even though they're not apps. Also, iMessage apps are distributed through their own iMessage App Store. You will learn more about this later in this chapter.
First, you will gain a broad understanding of iMessage apps and what possibilities they give you as a developer. Once this is established, you will...
