Chapter 13Launching, Backgrounding, and Extensions

We’ve been working to make our Twitter app better and better, gradually building out its capabilities and learning new skills along the way. Our users are going to be happy with how they can see their timeline, drill down into details, and send new tweets.

However, ours is just one of many apps on the user’s device. It will come and go as needed, with the typical user spending only a minute or less in our app, or any other. That’s the nature of apps on mobile devices: App A does Thing A, App B does Thing B, and never the twain shall meet. But as iOS has evolved over the years, it has accumulated more and more ways in which apps can work together to increase their mutual usefulness. Apps have ...

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