cloudkit share data between users

Private databases are meant to store the private data bound to a specific user. The UICloudSharingController class provides a pre-built view controller which handles much of the work involved in gathering the necessary information to send a share link to another user. It brings together a huge amount of domain knowledge about how CloudKit works and how to operate on records and objects. Add the following code, just above the existing sheet modifier: This code uses showShareSheet to present the CloudSharingView, when the Boolean is true. The version held by the server at the time you submitted the request. Heather, Jermaine, Percy, and Mary are all test accounts. Figure 48 2 shows an example share options settings screen: Once a method of communication has been selected by the user from the cloud sharing controller, the completion handler assigned to the controller will be called. When the user taps the link that was shared earlier and accepts the invitation, the delegate calls this method and launches the app. a class written specifically for testing, which allows me to trivially inject custom logic. If you sent the invitation from a real device, that can be a simulator. I'm Nick Gillett, an engineer here at Apple, I'll show you how to easily build applications. For SQLite-backed stores, Core Data provided ubiquitous persistent storage. For these reasons, I am using the operations in these code examples. So be sure to use NSPersistentCloudKitContainer's initializeSchema method to ensure that all your fields are present and correctly typed before deploying your schema to production. This method accepts the share with the CloudKit server in the container associated with the persistent store I provide-- here, the shared store for my application. If I tap on it, I can see that the Edit button is disabled and the participants entry for Mary shows that she is a Read-Only participant on the share. Discover how to create informative experiences around shared data and learn about the CloudKit technologies that support these features in Core Data. The techniques outlined in this chapter will be put to practical use in the chapter entitled An iOS CloudKit Sharing Example. Finally, I'll tap Send to send the email. The simple act of writing a record to the database is straightforward enough, but in my example, with multiple clients, this is where youll face the potential issue of handling a conflict when multiple clients attempt to write to the server concurrently. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. Build and run. Customizations like this necessarily require. These values are stored in a new payload on CKRecord called encryptedValues, introduced in the "What's New in CloudKit" session. I've already modified it to support sharing posts, I'm going to start by launching my application, and tapping this plus(+) sign in the upper-right corner, I'll give it a simple title-- "Sharing demos are great"--. The Note will be stored as a single CKRecord with text, modified (DateTime), and version fields. You would need a unique identifier for that CKRecord. This seems to be a good tool for that: https://github.com/usebutton/ios-deeplink-sdk When you ask CloudKit to save the record, this is where you may have to handle a conflict due to another client updating the record since the last time you fetched it. Youll need to ensure that you have set a unique bundle identifier at this point. However, such conflicts can arise from other circumstances. NSPersistentCloudKitContainer turns those managed objects. 2 Reviews. It is important to be aware that when a share recipient accepts a share they are actually receiving a reference to the original record in the owners private database. Even in this humble sample application, I've had to make a number of changes to the user interface to present information about shared objects. NSPersistentCloudKitContainer automatically syncs. Then, select the CloudKit checkbox to enable the feature. How might we build an experience like this? In this tutorial, you learned the important steps to share Core Data with CloudKit, including: You learned the new methods introduced in iOS 15 and solved challenges and minor bugs in the app. No specific cutoff point is specified (a maximum of 1MB total is recommended for each CKRecord), but as a rule of thumb, just about anything that feels like an independent item (an image, a sound, a blob of text) rather than as a database field should probably be stored as a CKAsset. - Accepting a shared note will now move it to the top level of your notes folder - Fixed a bug where clicking on the month name on macOS shifted the calendar weeks - Improved website titles when pasting a web link in NotePlan - iCloud Drive sync is now hidden as a sync option for new users since Cloudkit provides a better sync experience Sharing CKAssets between users with CloudKit? After the share has been saved to the database, the cloud sharing controller needs to be notified that the share is ready to be sent. Within this container, youre going to use the private database (because you want the users note to be seen only by that user) and within the private database, youre going to use a custom record zone, which enables notification of specific record changes. What's the difference between a power rail and a signal line? The next step of preparing your shared data is to enable storing your data in iCloud. Due to network latency, airplane mode, and such, CloudKit will internally handle retries and such for operations at a qualityOfService of utility or lower. This chapter has covered the basics of CloudKit sharing, a topic which will be covered further in a later chapter entitled An iOS CloudKit Sharing Example. Under isShared(object:), add the following methods: These methods return a Boolean based on the objects permissions. In a CloudKit database-- for example, the .private database-- NSPersistentCloudKitContainer typically manages a private zone to store the objects an application creates. A general guideline is to use com.company_name.bundle_identifier. Jordan's line about intimate parties in The Great Gatsby? Photos also allows me to view the participants on the album. When the app comes up, youll notice the shared journal entry doesnt show up. So, an offline mode must be carefully considered. I had to decorate the post table cells to indicate which ones are shared. Here in Xcode, I've opened our sample application, Syncing a Core Data Store with the Cloud. How might I do that? Sync user data between multiple apps from the same developer. and operate on the objects I share with them. Next, I'll tap Mail and invite Jermaine and Mary. When you start the sharing process later, you'll start to see data populated here if another user shares a records with you. Thankfully, CloudKit is explicitly designed to handle this condition. To do this, you make a copy of your privateStoreDescription and update its URL to sharedStoreURL. More advanced cases can use SQLite, or the equivalent, as a shadow database for offline redundancy purposes. With this code in place, navigate back to DestinationDetailView.swift to present CloudSharingView. Every app automatically gets a default CKContainer, and a group of apps can share a custom CKContainer if permission settings allow. Modern mobile application development requires a well thought-out plan for keeping user data in sync across various devices. Share Core Data between users with NSPersistentCloudKitContainer Ask Question Asked 3 years, 7 months ago Modified 1 year, 8 months ago Viewed 3k times 16 Apple introduced the NSPersistentCloudKitContainer with iOS 13 which enable us to use CloudKit with Core Data. We'll show you how to encourage collaboration between people using your app and support those interactions with Apple frameworks. We and our partners use cookies to Store and/or access information on a device. NSPersistentCloudKitContainer shares objects. rev2023.3.1.43269. Select Private Database. At the moment, when you launch the app, entries in your journal all look the same. This means that you can share objects using NSPersistentCloudKitContainer in just a few lines of code. The UICloudSharingController is a view controller that presents standard screens for adding and removing people from a CloudKit share record. Youll build this action in this tutorial. These are all the changes I had to make for my first demo, but my application also needs to effectively communicate what objects are shared, who they're shared with, and what those participants can do. From the home screen, open Settings. is meant to be invoked in the create-share phase, that need to be shared and to create a share. An object that represents activity in a persistent CloudKit container. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Once you add the destination, tap the destination to view DestinationDetailView. Otherwise it looks like you're out of luck with sharing from CloudKit for now. Ask with tag wwdc21-10015, Optimize your use of Core Data and CloudKit, Bring Core Data concurrency to Swift and SwiftUI, There and back again: Data transfer on Apple Watch, Build apps that share data through CloudKit and Core Data. informative user interfaces for our users. But in my application, I took a slightly different approach. I can see my new album with the photo I shared. What's important is that it's way more complicated than I can easily exercise every time I want to verify a change to the table view, and trying to do so would add a lot of friction to the development process. we need to identify two crucial concepts for sharing. Streaming is available in most browsers, and in the WWDC app. To improve this, go back to HomeView.swift. I might need to know whether or not an object is shared. Once youve completed these steps, the data in your app then automagically sync with iCloud. Open CoreDataStack.swift. to store objects in a specific shared zone. Log in to your iCloud account on a real device. Before an app can take advantage of CloudKit sharing, the CKSharingSupported key needs to be added to the project Info.plist file with a Boolean value of true. Apple has been adding data sharing into many of its first-party apps, including: Files Reminders Notes Calendar Photos Activities Find My Maps Music Health Once set up, operations are passed to the CKDatabase object, where theyll be executed on a background thread. For each participant, NSPersistentCloudKitContainer manages objects in two CloudKit databases, the .private and the .shared database. This is a thorny problem with many gotchas and pitfalls, but users expect the feature and expect it to work well. Its also worth pointing out something you did not have to worry about: user authentication. to NSPersistentCloudKitContainer to support sharing. The first step does a one-time setup in preparation for writing the record, and the second step passes the assembled record down to the singleton CloudKitNoteDatabase class. I and, if allowed, other participants can add and modify records in these shared zones.
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