Intermediate iOS Programming with Swift: iOS 10 and Swift 3 by Simon Ng

Author:Simon Ng
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2017-06-21T04:00:00+00:00

Understanding How App Extensions Work

Before getting started with the Today Extensions, let's first take a look at how extensions work. To start off, app extensions are not standalone apps. An extension is delivered via the App Store as a part of an app bundle. The app that the extension is bundled with is known as the container app, while the app that invokes the extension is the host app. For example, if you're building a weather app that bundles a weather extension, the weather extension will appear in the Today View of the Notification Center. Here the weather app is the container app and the Notification Center is the extension's host app. Usually, you bundle a single app extension in a container but you're allowed to have more than one extension.

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