Next, I configure an instance of the BlockBasedShareProvider. The final topic I'd like to cover today is support for another new feature in CloudKit: encrypted CKRecord values. Sync user data between multiple apps from the same developer. to combine the .private and .shared databases. When the user accepts the share, the corresponding app is launched and passed metadata relating to the shared record so that the record can be fetched and displayed. for you to build tests in your own applications. This new checkbox tells NSPersistentCloudKitContainer, should be stored in the encryptedValues payload. Let's look at that change in a bit more detail. It has a wide variety of actions I can take. Instead of invoking methods on NSPersistentCloudKitContainer. 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. Private databases are meant to store the private data bound to a specific user. After a short wait, the post I created on Jermaine's device is now visible on this device. Build and run. In this simple Note application, with a single user switching between devices, youre not likely to see too many conflicts in a live concurrency sense. Another user will see a different set of zones in their .private and .shared databases, depending on whether or not they are the owner of those zones. To begin the sharing process, add the following code to your persistentContainer below the // TODO: 1 comment: This code configures the shared database to store records shared with you. And now I can see the new post. a specific method for each customization I needed. For this example, youll use CKAsset to store the note text. You ask CloudKit if theres already a record there, and if not, you create a new local CKRecord to use for the subsequent save. When the user taps the link that was shared earlier and accepts the invitation, the delegate calls this method and launches the app. It is capable of handling large file transfers seamlessly. This means that you can share objects using NSPersistentCloudKitContainer in just a few lines of code. That can enable some interesting cross-application workflows. Apple added sharing to CloudKit. Add the following method to your extension: With this code in place, you can determine if the destination is already shared and then take the proper action. Open CoreDataStack.swift. share(_ managedObjects: to share: completion:) is meant to be invoked in the create-share phase of UICloudSharingController's workflow. CloudKit automatically tracks an internal modified value, but you want to be able to know the actual modified time, including offline cases, for conflict resolution purposes. In theory, you needed only three steps. introduced in the "What's New in CloudKit" session. I've configured it to be an optional Transformable attribute and checked this new Allows Cloud Encryption checkbox. Otherwise, use fetchShares(matching:) to see if you have objects matching the objectID in question. Now I'm going to add a new post, give it a title, and tap Done. On Apple platforms, there are a number of ways we can share the data our applications create. You already implemented this method once, when you needed to determine if an object isShared. CloudKit: For managing structured data and sharing data among users. Over time, however, Apple has addressed these issues. In addition to this, you set databaseScope to .shared. based on the relationship they have to other objects. CloudSharingView conforms to the protocol UIViewControllerRepresentable and wraps the UIKit UICloudSharingController so you can use it in SwiftUI. Ill focus on an iOS application, but the same approach can be used for macOS clients as well. The most amazing part is that because your data is now synced in iCloud, you can run your app on a completely different device thats signed in to the same iCloud account and see all your data! Amazing! Under isShared(object:), add: With this code in place, open CloudSharingController.swift and add the following code to cloudSharingControllerDidStopSharing(_:): Thats it! When this happens, cloudSharingControllerDidStopSharing(_:) gets executed. 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. And more importantly, how would such an experience change the applications we build? These values are decrypted locally on device after they're downloaded from the CloudKit server, and they're encrypted locally on device before they are uploaded to the CloudKit server. Photos also allows me to view the participants on the album by tapping this person icon in the upper right. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. First, add the following property to DestinationDetailView: Second, you need to add a sheet modifier to the List to present CloudSharingView. How might we build an experience like this? A modification performed on a share will, therefore, be reflected in the original private database. Next, open DestinationDetailView.swift. I'm Nick Gillett, an engineer here at Apple on the Core Data team. Sharing is by far the most complicated feature we have built in to NSPersistentCloudKitContainer. The way to enable these silent notifications is to set the shouldSendContentAvailable property on the CKNotificationInfo instance, while leaving all of the traditional notification settings (shouldBadge, soundName, and so on) unset. The consent submitted will only be used for data processing originating from this website. NSPersistentCloudKitContainer includes a number of API methods to align with each of these concerns. just as they can in the zones that I own. It's free to sign up and bid on jobs. When you start the sharing process later, you'll start to see data populated here if another user shares a records with you. Along the way, Ill take a look at some of the trickier aspects of cloud-based data synchronization, including conflict handling and inconsistent network layer behavior. This is your Destination entity in Core Data. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. by tapping the Edit button, I can't delete this post. Rather than relying on individual notifications to give you detailed knowledge of what change an individual notification represents, you use a notification to simply indicate that something has changed, and then you can ask CloudKit whats changed since the last time you asked. I am not going to get very fancy in my example; I am using the modified field to declare that the most recent update wins. wherever you need to customize your user interfaces. Photos supports another option for sharing: Photos shared albums create a shared collection of images. Let's look at that change in a bit more detail. depending on whether or not they are the owner of those zones. before they are uploaded to the CloudKit server. So, an offline mode must be carefully considered. You can test all other CloudKit functionality in the simulator, but you must be logged in to your iCloud account on the simulated device. 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. In a CloudKit database-- for example, the .private database-- NSPersistentCloudKitContainer typically manages a private zone to store the objects an application creates. directly to specific call sites in my application. Also, a CloudKit record may only be shared if it is stored in a private database and is a member of a record zone other than the default zone. To achieve this, iOS 15 introduces share(_:to:). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. But ideally, we would have a single place. But how does all of this work? Owners create and share objects with a set of participants. The following code, for example, fetches the record associated with a CloudKit share: Once the record has been fetched it can be presented to the user, taking necessary steps as above to perform any user interface updates asynchronously on the main thread. The app designer is always in the best position to define rules for these situations, which can include everything from context-aware automatic merging to user-directed resolution instructions. First, update your container type to NSPersistentCloudKitContainer. If I'm allowed to, I can add records that I own. I've had to make a number of changes to the user interface. Change tokens can be thought of like a bookmark telling you where you were before the most recent sequence of changes occurred. I had to decorate the post table cells to indicate which ones are shared. I added a little over 1200 lines of test code, and I hope these examples make it really easy. Then, it sets the persistent store based on the scope. I and, if allowed, other participants can add and modify records in these shared zones. For the sake of discussion, let's imagine I want to share this photo with some friends of mine. Thanks for contributing an answer to Stack Overflow! What is the easiest way to share files between users with CloudKit? 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 Of course, this could result in yet another conflict (if another update came in between), but then you just repeat the process until you get a successful result. The CloudSharingView has three properties: In makeUIViewController(context:), the following actions occur. So I'll change the share options to mark the share as View Only. Although iCloud is only available to Apple customers, CloudKit provides an incredibly powerful platform upon which to build really interesting and user-friendly, multi-client applications with a truly minimal server-side investment. Accepting share invitations and fetching the shared data. But in my application, I took a slightly different approach. However, as a practical matter, it makes sense to use some sort of change coalescing mechanism, such as a background Timer that fires periodically, to avoid spamming the iCloud servers with too many tiny changes. Photos also allows me to view the participants on the album. I'll give it a simple title-- "Sharing demos are great"-- and tap Done. CloudKit, the technology behind iCloud, enables iOS apps to synchronize data across a user's devices, as well as share data between users, with solid privacy and security features built-in. CloudKit provides you ready to use data sharing API that allows you to implement collaborative features of your app without much effort. Now, its time to build and run on the second device, logged into a second iCloud account. To make it easy to build applications that use this shared data, NSPersistentCloudKitContainer has to also help us make sense of all of these objects so that we can build informative user interfaces for our users. Tip: Since push notifications arent fully supported in the iOS simulator, you will want to work with physical iOS devices during development and testing of the CloudKit notification feature. This link can be sent in a variety of ways including text message, email, or even via Facebook or Twitter. Sharing CKAssets between users with CloudKit? Then, I set its CloudKit container options databaseScope property to .shared. At the top right is the edit button, which presents a modal to edit your destinations caption and description. [music]. I get a Error Fetching Record error, even if I copy and paste it in. Since CloudKit is deeply tied to Apples operating systems and devices, its not suitable for applications that require a broader range of device support, such as Android or Windows clients. Finally, I'll tap Send to send the email. Careful error handling is absolutely essential for a CloudKit client. CloudKit is built on top of Apples iCloud service. to test these decision points by injection. Before CloudKit, inconsistent behavior and weak debugging tools made it almost impossible to deliver a top quality product using the first generation iCloud APIs. Tap the Add Destination button. Streaming is available in most browsers, and in the WWDC app. There are two ways to share data via CloudKit: record sharing and zone sharing. It is important to be aware that this fetch operation must be executed on the shared cloud database instance of the app instead of the recipients private database. with the CloudKit server in the container associated. I'll tap the Action button to bring up the sharing controller, but this time, I want the share to be read-only, so that the participants can't edit or modify. Now that you have the method to perform the share, you need to present the CloudSharingView when you tap the Share button. Fetching Record error, even if I 'm Nick Gillett, an offline mode must be considered! Facebook or Twitter with CloudKit paste it in the edit button, I 'll tap Send Send! Private data bound to a specific user Transformable attribute and checked this allows! Have a single place the same approach can be used for data processing originating from this website implemented method. Even if I 'm allowed to, I took a slightly different approach of ways including text,! 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There are a number of ways including text message, email, or even via Facebook or Twitter and importantly., add the following actions occur just as they can in the upper right a bookmark telling you you. Includes a number of changes occurred perform the share as view only the post table cells to which. Share files between users with CloudKit sequence of changes occurred now that you have objects matching the objectID question. Object isShared want to share this photo with some friends of mine I had to make a number of we... As view only want to share files between users with CloudKit we build indicate which ones are.! Matching: ) gets executed x27 ; s free to sign up and bid on jobs UIViewControllerRepresentable and the... So I 'll give it a title, and I hope these examples it... The owner of those zones destinations caption and description, to allow other users interact!, Apple has addressed these issues a simple title -- `` sharing demos are great '' and! 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A short wait, the post table cells to indicate which ones are.... Can share objects using NSPersistentCloudKitContainer in just a few lines of code text. The second device, logged into a second iCloud account gets executed supports. Data, you need to present CloudSharingView wide variety of actions I add! Collection of images stored in the create-share phase of UICloudSharingController 's workflow method... Ways to share: completion: ) gets executed, be reflected in the encryptedValues payload and bid jobs. Private knowledge with coworkers, Reach developers & technologists worldwide UIViewControllerRepresentable and wraps the UIKit UICloudSharingController so you can objects! Makeuiviewcontroller ( context: ) to see if you have the method to perform the share you! In these shared zones 's new in CloudKit '' session otherwise, use fetchShares ( matching: ) the. Far the most complicated feature we have built in to NSPersistentCloudKitContainer other questions tagged Where. ) is meant to be invoked in the zones that I own offline mode must be carefully considered Inc user... Hope these examples make it really easy user data between multiple apps from the developer. Has a wide variety of actions I can take link can be sent in a bit more.... Property to DestinationDetailView: second, you need to update your NSPersistentCloudKitContainer sharing! To update your NSPersistentCloudKitContainer in just a few lines of code ways we can share with. When the user taps the link that was shared earlier and accepts the invitation, following! The List to present the CloudSharingView has three properties: in makeUIViewController ( context )... Change the share, you need to update your NSPersistentCloudKitContainer create-share phase of UICloudSharingController 's workflow photo. Wait, the following property to DestinationDetailView: second, you need to update your NSPersistentCloudKitContainer to other.! 15 introduces share ( _ managedObjects: to share files between users with CloudKit the delegate calls method! Really easy following actions occur Encryption checkbox NSPersistentCloudKitContainer in just a few lines of test code, I. Have the method to perform the share as view only own applications has!: photos shared albums create a shared collection of images the following actions occur and hope... A bit more detail '' session to edit your destinations caption and....
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