SynchronizingALocalStoreToTheCloud

Synchronizing a Local Store to the Cloud

Share data between a user’s devices and other iCloud users.

Overview

• Note: This sample code project is associated with the WWDC21 session 10015: Build Apps that Share Data Through CloudKit and Core Data .

Configure the Sample Code Project

Before you run the sample code project in Xcode:

1. Set your bundle identifier.
   • Select the CoreDataCloudKitDemo project.
   • Select the General tab.
   • In the Identity section, set the Bundle Identifier to your reverse domain name followed by the project name.
2. Set your development team.
   • Select the CoreDataCloudKitDemo project
     • Select the Signing & Capabilities tab.
     • Select your development team from the dropdown list.
3. Update the product bundle identifier for the test targets.
   • Select the CoreDataCloudKitDemoUnitTests target.
     • Select the Signing & Capabilities tab.
     • Select your development team from the dropdown list.
     • Select the Build Settings Tab.
     • Find product bundle identifier and change it to a value appropriate for your team.

Configuration Options

To facilitate testing the application supports the following configuration options parsed in to properties by the AppDelegate class:

• -CDCKDTesting
  • Set to 1 to store files in a special directory, TestStores, so that tests do not overwrite user data.
• -CDCKDAllowCloudKitSync
  • Set to 0 to disable CloudKit sync during testing
• com.apple.CoreData.ConcurrencyDebug
  • Enables Core Data multi-threading assertions to verify the correct queue is used for all Core Data operations.