Main App Project SetupĬreate a new single view project in Xcode. You can use an embedded framework to share code, use a database in the shared container, or use NSURLSession with the shared container so that both the main app and the extension can access downloaded data. To share more data or to reuse code between your main app and your extension, see Apple’s documentation in the App Extension Programming Guide (which you should probably read anyway). Apple recommends using Core Data, SQLite, or Posix locks. If you need to have both apps write to the data, Atomic Bird’s has a great blog post explaining approaches and potential issues. ![]() ![]() In our example this isn’t a concern because only the main app will write the data. Since different processes are sharing the same data you need to be careful not to corrupt your data. We’ll use the simplest way: adding both apps to an App Group and using a set of shared NSUserDefaults to pass the timestamp from the main app to the extension. Since the extension and the main app are separate programs, communication between them isn’t trivial. Behind the scenes the extension gets compiled to a binary that gets included in the main app’s bundle so they can be submitted to the App Store as a single entity. So we’ll need two targets in our project: our main app and our extension app. How Extensions WorkĪ widget is a separate program from your main app even though it can’t exist without the main app. At least I think you do, I couldn’t get it to work without one but if anyone manages to please let me know and I’ll update this tutorial. In order to set up the data sharing between the extension and the main app you’ll need an Apple Developer account. This tutorial has been updated for Swift 2.0 and Xcode 7. and a data store that’s shared between the two apps.a main app that saves the time it’s run.Since extensions aren’t part of the app they’re associated with that’ll require: It’ll just tell you the last time you ran the main app. ![]() Today we’ll create a simple app with a today widget. This view is called a Today extension or just a widget. In Xcode 11, we can also perform the above setup using the File > New > Swift Package menu command. As of iOS 8 your app can add a section to the Notification Center that users see when they swipe down from the top of the screen. To get started, we’ll create a new folder (with a name that matches what we want our package to be called), and we’ll then run swift package init within it to create our package: mkdir TodoKit cd TodoKit swift package init.
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