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Mastering iOS 11 Programming - Second Edition by Donny Wals

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Understanding app extensions

Ever since iOS 8, developers have acquired more and more opportunities to add extensions to their applications. In iOS 11, there are 24(!) different ways for you to integrate with iOS. Not every app can or should integrate on all 24 extension points, but it's good to be aware of the fact that there are many ways for your app to stand out from the crowd and blend in with iOS:

The preceding screenshot captures several names for the 24 extensions that you can integrate into your apps. You'll notice that there's a Spotlight index extension. If you're indexing your app in Spotlight and you want to make sure that Spotlight ...

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