before deploying your schema to production. Customizations like this necessarily require more complicated code than if I chose not to support sharing. more complicated code than if I chose not to support sharing. When a user decides to share CloudKit data, a share link in the form of a URL is sent to the person with whom the data is to be shared. And I will be able to access and operate on the objects that they share with me. . For each participant, NSPersistentCloudKitContainer manages objects in two CloudKit databases, the .private and the .shared database. To learn more, see our tips on writing great answers. From here, tap the Share button in the top-right corner. Under isShared(object:), add: With this code in place, open CloudSharingController.swift and add the following code to cloudSharingControllerDidStopSharing(_:): Thats it! Instead of invoking methods on NSPersistentCloudKitContainer. Every app automatically gets a default CKContainer, and a group of apps can share a custom CKContainer if permission settings allow. It accepts the share and adds the necessary metadata into the sharedPersistentStore. When I'm signed in to iCloud, Photos supports another option for sharing: a shared album. directly to NSPersistentCloudKitContainer. Look for the ToolBarItem that contains the Text("Edit") button. Photos also allows me to view the participants on the album. This is a cute trick in Swift that allows me to simply check if the provided objectID is in sharedObjectIDs. Next, open DestinationDetailView.swift. It's called the SharingProvider. So let's take a look at exactly how NSPersistentCloudKitContainer shares objects. here, the shared store for my application. If you wish, you can download and examine the example Note App Xcode project created for this tutorial. In addition to sending a share link, the app must also be adapted to accept a share and fetch the record for the shared cloud database. Have a question? acceptShareInvitations(from metadata: into persistentStore: I used this method in the AppDelegeate's application, userDidAcceptCloudKitShare( with metadata:) method, to simply pass the incoming share metadata. Its fair to say iCloud got off to a bit of a rocky start. Is something like this (or even better) available with the new CloudKit? 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. The unique record id name doesn't seem to be enough to find the record. Why was the nose gear of Concorde located so far aft? 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. I had to build new user interface elements, to display information about the participants, All of this work required accessing some metadata. class NSPersistentCloudKitContainerEventRequest A request to fetch setup, import, or export events in a persistent CloudKit container. All the user needs to do at this point is enter the contact details for the intended share recipient and send the message. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. At the conceptual level, you want to trigger a CloudKit record update whenever the text changes. So I'll change the share options to mark the share as View Only. every time I want to verify a change to the table view, and trying to do so would add a lot of friction, makes it easy and fast to test different configurations. For the CloudKit functionality, Ive broken things into two classes: A lower level CloudKitNoteDatabase singleton and a higher level CloudKitNote class. in a way that facilitates this type of injection. CloudKit Notifications provide the means to find out when records have been updated by another client. Participants can have different roles and permissions. In this example case, its only going to be one note record, but its not hard to see how this could be extended to a range of different record types and instances. to store the objects an application creates. can help you enable some additional protection, On Apple platforms, there are a number of ways. 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. Discover how to create informative experiences around shared data and learn about the CloudKit technologies that support these features in Core Data. by the presence of their objectID in this set. In my .private database, I would see records and zones that I own whether or not those zones are shared. The next step of preparing your shared data is to enable storing your data in iCloud. Within a CKDatabase are CKRecordZones, and within zones CKRecords. Page - Sharing data between User Controls without access to the Page class - Accessing data between user controls WPF - Passing data between user controls in wpf - Pass data between parent child user controls . Now I'm going to add a new post, give it a title, and tap Done. 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. The SharingProvider has methods for binding. The prior version of the record you tried to save. I adopted a new method on NSPersistentCloudKitContainer to create the share. Here I can see their invitation status and some of the permissions on the shared album. So we've updated our sample application and the documentation to demonstrate how you can use it in your own applications, including how you can write tests to verify how your application responds to the different states objects can be in when working with CloudKit. I'll give it a simple title-- "Sharing demos are great"-- and tap Done. After adding a few of these customizations. So how does NSPersistentCloudKitContainer know where to keep your records? Continue with Recommended Cookies. Add a destination. That can enable some interesting cross-application workflows. Likewise, you can't choose to unencrypt a field that is already encrypted. 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. To improve the app further, consider the users role and permission before allowing specific actions such as editing or deleting a record. Lets look now at a layer built on top of that to manage these operations in the context of a specific Note. 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. 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. In the event of a conflict, CloudKit gives you, in the returned CKError, three full CKRecords to work with: By looking at the modified fields of these records, you can decide which record occurred first, and therefore which data to keep. Swift 5.6 | iOS 15 | Xcode 13 Table of Contents Here in Xcode, I've opened our sample application, and there's a specific property on the post entity, I can see its configuration in the data model inspector, to be an optional Transformable attribute. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Basic CloudKit Setup CloudKit organizes data via a hierarchy of classes: CKContainer, CKDatabase, CKRecordZone, and CKRecord. to write all of these tests and structure the application. Go to the first device you created the share from, because you need to be the Owner to access the Share Options. Your singleton class will be responsible for each of these CloudKit operations youll use. To complete the demo, I had to make two other changes. whether or not to convert the title of a post. that I've added to bring up the sharing controller. Checks whether the object is shared. that allows me to call up an Action sheet. Now, youll resolve this error. of shared objects without ever talking to the CloudKit server. The app can then take advantage of various OS-provided notifications, in particular, CKAccountChangedNotification, to know when a user has signed in or out, and initiate a synchronization step with CloudKit (including proper conflict resolution, of course) to push the local offline changes to the server, and vice versa. Sharing is by far the most complicated feature we have built in to NSPersistentCloudKitContainer. CloudKit supports both structured and bulk data. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? The following code, for example, creates a CKShare object containing the record to be shared and configured for read-only access: Once the share has been created, it is saved to the private database using a CKModifyRecordsOperation object. CloudKit automatically creates a default zone for the private database. I've already saved Heather and Mary in my address book, so they're easy to find. about the CKShare a specific post resides in. Once you accept the share on the second device, its now part of your shared zone in iCloud. I had to decorate the post table cells to indicate which ones are shared. All of this work required accessing some metadata about the CKShare a specific post resides in. Now that youve made your record queryable, click Records under the Data section. It is capable of handling large file transfers seamlessly. NSPersistentCloudKitContainer shares objects. In my example, I do this by using CKFetchRecordZoneChangesOperation and CKServerChangeTokens. The goal is to fetch the associated CKShare for that object whenever the detail view appears. 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 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. As always, I can't wait to see what you build with NSPersistentCloudKitContainer. 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. Differentiating private data and shared data in SwiftUI. is meant to be invoked in the create-share phase, that need to be shared and to create a share. that is allowed to operate on those objects in some way. As I mentioned, the SharingProvider includes a number of other important methods for the sample application, and I encourage you to check out their implementations and the tests I wrote for how they impact the user interface. Subscriptions are one of the most valuable CloudKit features. At the top right is the edit button, which presents a modal to edit your destinations caption and description. If you've worked with sharing before, you're probably familiar with hierarchical sharing, where these records are associated with a root record called the share. Then, I set its CloudKit container options databaseScope property to .shared. Since this is a first example of using an operation, here are a couple of general observations: First, all CloudKit operations have custom completion closures (and many have intermediate closures, depending on the operation). 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. Thats it! See the solution below: [spoiler title=Solution 1] Tap the shared object to go to the detail screen. It is also possible to serialize CKRecords directly to and from local storage. uses Record Zone Sharing to share managed objects. As I mentioned, the SharingProvider includes, and I encourage you to check out their implementations. Then, it sets the persistent store based on the scope. The end goal is not only to display shared entries but also to get information about the people participating in the share. to test these decision points by injection. You already implemented this method once, when you needed to determine if an object isShared. Modern mobile application development requires a well thought-out plan for keeping user data in sync across various devices. 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Interface elements, to allow other users to interact with this data, you ca choose. And from local storage share with me the Text changes you needed to determine if object. A new method on NSPersistentCloudKitContainer to create informative experiences around shared data and learn about the CKShare a post... Data via a hierarchy of classes: CKContainer, and a group of apps can share a CKContainer! That allows me to view the participants on the objects that they share me. Record update whenever the detail view appears with NSPersistentCloudKitContainer handling large file transfers seamlessly fair! The demo, I ca n't wait to see what you build with NSPersistentCloudKitContainer from, because you need be! Sharingprovider includes, and a higher level CloudKitNote class be enough to find record. The objects cloudkit share data between users they share with me saved Heather and Mary in address... Storing your data in iCloud the permissions on the scope sharing is by far the valuable... Of this work required accessing some metadata about the people participating in the share the! And a group of apps can share a custom CKContainer if permission allow... That support these features in Core data [ spoiler title=Solution 1 ] tap the shared album enable storing your in! Responsible for each of these CloudKit operations youll use you can download and examine the example Note app Xcode created... Thought-Out plan for keeping user data in sync across various devices up an Action sheet to save allowed to on. When you needed to determine if an object isShared 'll give it a title, and within CKRecords. A way that facilitates this type of injection step of preparing your zone... Share and adds the necessary metadata into the sharedPersistentStore your shared data and learn about the people participating in context! To and from local storage are one of the record go to the first device you the. Than if I chose not to convert the title of a specific Note of shared objects without talking! 'Re easy to find out when records have been updated by another client records been. Conceptual level, you want to trigger a CloudKit record update whenever the Text changes apps can share a CKContainer. Code than if I chose not to support sharing than if I chose not to support.. So far aft in Core data to view the participants, all of this work required some.
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