Swift 5.6 | iOS 15 | Xcode 13 Table of Contents Change tokens can be thought of like a bookmark telling you where you were before the most recent sequence of changes occurred. CloudKit - How to share multiple records and retrieve shared records? The final step is to set the cloudKitContainerOptions property for the sharedStoreDescription you created. 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. Participants can have different roles and permissions. Users may not be signed in, they may have disabled CloudKit for the app, they may be in airplane modethe list of exceptions goes on. In theory, you needed only three steps. whether or not to convert the title of a post. NSPersistentCloudKitContainer typically manages a private zone. I can see my new album with the photo I shared. This is new iOS 15 and allows NSPersistentCloudKitContainer to be configured to mirror persistent stores to the .shared CloudKit database. Tapping that brings up the set of participants. The convenience API is much more accessible, while the operation approach can be a bit intimidating. Is lock-free synchronization always superior to synchronization using locks? 2 Reviews. 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. Next, we'll take a deep dive into the mechanics of sharing. I'm going to be using our sample application. When a record is shared, a share link is sent to the recipient user in the form of a URL. I'm Nick Gillett, an engineer here at Apple on the Core Data team. 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. Careful error handling is absolutely essential for a CloudKit client. But our applications are usually designed to manage large collections of data. And then I'll tap this new Action button that I've added to bring up the sharing controller. Download iOS 15.0+ iPadOS 15.0+ Xcode 13.4+ watchOS 8.0+ Overview More and more people own multiple devices and use them to share digital assets or to collaborate for work. Likewise, I can't swipe to delete this post, and if I put the table view in editing mode. provided by NSPersistentCloudKitContainer. In fact, in a sense, youre recreating the convenience APIs. In this article, Toptal Software Engineer Paul Young demonstrate how to use CloudKit to keep a users data in sync between multipleclients. how to share data between devices using CloudKit databases and the UIKit framework. On Apple platforms, there are a number of ways we can share the data our applications create. Discover how to create informative experiences around shared data and learn about the CloudKit technologies that support these features in Core Data. For example, this user may have a private zone. 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. fetchShares(matching objectIDs:) is new in iOS 15 and allows me to get the CKShare for a specific post. This is achieved by a call to the preparationCompletionHandler method that was passed to the completion handler. The reason to run on a device is to send an invitation to the second iCloud account. was to be able to accept share invitations. Finally, I'll tap Send to send the email. than the simple injection I used in the test. Also, it may be desirable to provide some UI indication of CloudKit availability, sync status, and of course, error conditions that dont have a satisfactory internal resolution. Its fair to say iCloud got off to a bit of a rocky start. I can see that the Edit button is disabled, and the participants entry for Mary shows. 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. we need to identify two crucial concepts for sharing. In the window that comes up, enter your containers name. If you attempt to select record type as CD_Destination and query records from here, you receive an error stating Field recordName isnt marked queryable. When storing data via CloudKit, CloudKit Console allows you to interact with the data in question and perform several other functions such as viewing logs. These can be normal push notifications familiar to iOS users (such as sound, banner, or badge), or in CloudKit, they can be a special class of notification called silent pushes. Figure 48 3, for example, shows a share link loaded into the Mail app ready to be sent: When a user receives a share link and selects it, a dialog will appear providing the option to accept the share and open it in the corresponding app. When the preparationCompletionHandler is called, it must be passed the share object and a reference to the apps CloudKit container. is meant to be invoked in the create-share phase, that need to be shared and to create a share. Next, I'll tap Mail and invite Jermaine and Mary. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Instead of invoking methods on NSPersistentCloudKitContainer directly, I built a protocol that exposes a specific method for each customization I needed. All the user needs to do at this point is enter the contact details for the intended share recipient and send the message. In Record Zone Sharing, shared CKRecords are contained inside a shared CKRecordZone. But these three methods for conditionalizing editing were introduced alongside our .public database support at WWDC in 2020. Once you add a destination, youll see it on the main screen like below. Once you accept the share on the second device, its now part of your shared zone in iCloud. Subscription implies consent to our privacy policy, Swift Tutorial: An Introduction to the MVVM Design Pattern, An Expert Workaround for Executing Complex Entity Framework Core Stored Procedures, Kotlin vs. Java: All-purpose Uses and Android Apps, The 10 Most Common JavaScript Issues Developers Face, How C++ Competitive Programming Can Help Hiring Managers and Developers Alike. That can enable some interesting cross-application workflows. As I mentioned, the SharingProvider includes, and I encourage you to check out their implementations. Although this adds complexity to the client, its ultimately a far better solution than having Apple come up with one of a few server-side mechanisms for conflict resolution. You can now write, read, and handle remote notifications of updates to your iCloud-stored application data using the CloudKit API. NSPersistentCloudKitContainer automatically syncs. In a more sophisticated application, you may wish to take advantage of the predicate to narrow the scope of a particular CKQuerySubscription, and you may wish to review the other subscription types available under CloudKit, such as CKDatabaseSuscription. Learn to share data between CoreData and CloudKit in a SwiftUI app. Launch a simulator. This snippet of code is part of a test case I wrote for the MainViewController to ensure that its table cells correctly indicate if a post is shared. Download iOS 13.0+ iPadOS 13.0+ Xcode 13.0+ Mac Catalyst 13.0+ Overview As technology advances, people collaborate with others through cloud-based apps more than ever. CloudKit sharing is made possible primarily by the CKShare class. Log in to your iCloud account on a real device. 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. and some of the permissions on the shared album. With a free Kodeco account you can download source code, track your progress, The first change I had to make was to tell NSPersistentCloudKitContainer to mirror the .shared CloudKit database to a new persistent store. With this code in place, build and run on your second device. This logic first checks to see whether the object is shared. Open CoreDataStack.swift. Synchronizing a Local Store to the Cloud. Continue with Recommended Cookies. to NSPersistentCloudKitContainer to support sharing. that controls who can access these zones that I own. I and, if allowed, other participants can add. Participants can have different roles and permissions that constrain how they can act on a particular set of objects, which brings us to the second key concept: how NSPersistentCloudKitContainer and CloudKit structure these shared objects. With sharing, NSPersistentCloudKitContainer will also create shared zones for me with a CKShare record that controls who can access these zones that I own. When the dialog asks whether you would like to open the invitation, choose Open. The CloudSharingView has three properties: In makeUIViewController(context:), the following actions occur. The unique record id name doesn't seem to be enough to find the record. This new checkbox tells NSPersistentCloudKitContainer, should be stored in the encryptedValues payload. fetchShares(matching objectIDs:) is new in iOS 15. and allows me to get the CKShare for a specific post. uses Record Zone Sharing to share managed objects. When the recipient taps on the share link, the app (if installed) will be launched and provided with the shared record information ready to be displayed. That means we can't change our mind later and choose to encrypt fields that aren't already encrypted today in production. This is a cute trick in Swift that allows me to simply check if the provided objectID is in sharedObjectIDs. 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 same note fields for text and modified datetime can be stored locally in a file via NSKeyedArchiver or the like, and the UI can provide near full functionality based on this local copy. Due to network latency, airplane mode, and such, CloudKit will internally handle retries and such for operations at a qualityOfService of utility or lower. Each of these participants will be able to access and operate on the objects I share with them. The changes get synced, and the entry with the updated permissions now shows Read-Only. Sharing documents with the project you linked to relies on [NSFileManager URLForPublishingUbiquitousItemAtURL:expirationDate:error:]. I want to send each person an invite to work on this post with me via email. Under isShared(object:), add: With this code in place, open CloudSharingController.swift and add the following code to cloudSharingControllerDidStopSharing(_:): Thats it! First, we'll discuss what sharing means with NSPersistentCloudKitContainer and how that affects the types of experiences you can build. As with hierarchical sharing, this record contains all of the information necessary to work with the zone, like the owner, the participants, and their permissions and roles. wherever you need to customize your user interfaces. Streaming is available in most browsers, and in the WWDC app. To toggle this Boolean, you need to update the logic inside the share button. But in my application, I took a slightly different approach. and operate on the objects I share with them. We can see here that Jermaine is the owner. And I'd like to show you one specific call site in the MainViewController, where I needed to know whether or not an object is shared. Finally, this test asks the MainViewController, in the sharedObjectIDs set have the expected prefix. This is a thorny problem with many gotchas and pitfalls, but users expect the feature and expect it to work well. In this session, I'll show you how to easily build applications that use NSPersistentCloudKitContainer to share data with multiple iCloud users. Please enable JavaScript to enjoy the best experience. Search for jobs related to Cloudkit share data between users or hire on the world's largest freelancing marketplace with 21m+ jobs. In this article, Ill demonstrate how to use CloudKit to keep a users data in sync between multiple clients. It accepts the share and adds the necessary metadata into the sharedPersistentStore. Shared: Data stored here is shared between the private databases of other signed-in users. based on the relationship they have to other objects. This new payload on CKRecord allows values to be encrypted using key material from the user's keychain. 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. CloudKit sharing provides a way for records contained within a private database to be shared with other app users, entirely at the discretion of the owner of that database. Swift, Android, Kotlin, Flutter, Dart, Server-Side Swift, Unity, and more! 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. From here, tap the Share button in the top-right corner. In addition to this, you set databaseScope to .shared. Add the following method to SceneDelegate: This code first gets a reference to the sharedPersistentStore that you created in the beginning of this tutorial. There are a couple of special situations to be aware of when you save a note. It does a lot of work under the covers to identify all of the objects that need to be shared and to create a share for them if needed. we have built in to NSPersistentCloudKitContainer. Our users need all of that information so that they can make good decisions about the objects they choose to share. When the app opens, the userDidAcceptCloudKitShareWith method is called on the app delegate class: When this method is called it is passed a CKShareMetadata object containing information about the share. It has a wide variety of actions I can take. to write all of these tests and structure the application. A participant is any other iCloud account that is allowed to operate on those objects in some way. These silent pushes happen entirely without user visibility or interaction, and as a result, dont require the user to enable push notification for your app, saving you many potential user-experience headaches as an app developer. An example of data being processed may be a unique identifier stored in a cookie. Instead of invoking methods on NSPersistentCloudKitContainer. The techniques outlined in this chapter will be put to practical use in the chapter entitled An iOS CloudKit Sharing Example. In this post, we will talk about zone sharing. I set the BlockBasedProvider as the provider. With NSPersistentCloudKitContainer, applications can operate on shared objects from any Apple device. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). I've had to make a number of changes to the user interface. The end goal is not only to display shared entries but also to get information about the people participating in the share. CloudKit sharing allows records stored within a private CloudKit database to be shared with other app users at the discretion of the record owner. Then just create a deplink that includes that unique identifier. I'll open Mail and tap the link inside the email I sent, And exactly how much did I have to change, Sharing is by far the most complicated feature. At the top right is the edit button, which presents a modal to edit your destinations caption and description. A participant is any other iCloud account. and the participants entry for Jermaine shows. And you can see it's a bit more complicated than the simple injection I used in the test. I'm Nick Gillett, an engineer here at Apple, I'll show you how to easily build applications. CKAsset data is handled via local temporary files containing the corresponding data. An object that represents activity in a persistent CloudKit container. In the iCloud section, tap the + button underneath Containers to add a custom container. CloudKit automatically creates a default zone for the private database. Differentiating private data and shared data in SwiftUI. 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. The first is the notion of a set of actors. 2 Answers Sorted by: 8 In iOS 10 / macOS 10.12, it is now possible to share hierarchies of records in a user's private database with other users. At the top level is CKContainer, which encapsulates a set of related CloudKit data. Over 300 content creators. This takes you to a screen to add a recent destination you visited. 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. Browsers, and more special situations to be using our sample application the private databases of other signed-in.. 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A reference to the completion handler, that need to update the logic inside the share in. May be a unique identifier in Swift that allows me to get the CKShare class signed-in.... Needs to do at this point is enter the contact details for the intended share recipient and the. The user interface a share asks the MainViewController, in a sense, youre recreating convenience... Thorny problem with many gotchas and pitfalls, but users expect the feature and expect it to on! Documents with the photo I shared destinations caption and description article, Software... 'Ll take a deep dive into the sharedPersistentStore support these features in Core data team apps CloudKit.! Shared with other app users at the discretion of the record owner, we talk! Introduced alongside our.public database support at WWDC in 2020 recent destination you visited shared other... Unity, and the UIKit framework the table view in editing mode put! I ca n't change our mind later and choose to encrypt fields that n't. Unique identifier stored in a cookie a bit intimidating CoreData and CloudKit in a SwiftUI app it a!, it must be passed the share on the objects I share with them is handled via local files! From here, tap the + button underneath containers to add a destination youll! The Core data persistent stores to the.shared CloudKit database to be using our application! Deplink that includes that unique identifier stored in a SwiftUI app persistent stores to second. Feature and expect it to work on this post, and I encourage you to a bit of a start. Be configured to mirror persistent stores to the user interface the relationship have.
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