Build apps that share data through CloudKit and Core Data. The exact version of the record you tried to save. At this point, if you shared the invitation via text message, open Messages and tap the invitation. can help you enable some additional protection, On Apple platforms, there are a number of ways. If it doesnt have an associated share record, theres no need to continue. And exactly how much did I have to change in the sample application? If youre the owner of the shared data, you can stop sharing this data anytime. NSPersistentCloudKitContainer manages these zones and automatically assigns records to them. With this code in place, build and run on your second device. Here I'm setting the isSharedBlock to call the contains method of the set I created. The SharingProvider protocol makes it easy. Within each CKContainer are multiple instances of CKDatabase. It: Now, open DestinationDetailView.swift. Loading a note is very straightforward. To complete the demo, I had to make two other changes. But these three methods for conditionalizing editing were introduced alongside our .public database support at WWDC in 2020. to call the contains method of the set I created. 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 objective of this chapter is to provide an overview of CloudKit sharing and the classes used to implement sharing within an iOS app. Next, I'll tap Mail and invite Jermaine and Mary. manages objects in two CloudKit databases. 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. In this session, I'll show you how to easily build applications that use NSPersistentCloudKitContainer to share data with multiple iCloud users. 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 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. There's a lot of new API to learn about. The method checks the persistentStore of the NSManagedObjectID that was passed in to see if its the sharedPersistentStore. Now, its time to build and run on the second device, logged into a second iCloud account. What is the easiest way to share files between users with CloudKit? It has a wide variety of actions I can take, including a number of ways to share. 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. of shared objects without ever talking to the CloudKit server. NSPersistentCloudKitContainer includes a number of API methods to align with each of these concerns. with the CloudKit server in the container associated. and the participants entry for Jermaine shows. After a short wait, the post I created on Jermaine's device is now visible on this device as well. Sharing is by far the most complicated feature we have built in to NSPersistentCloudKitContainer. Select Private Database. Learn to share data between CoreData and CloudKit in a SwiftUI app. 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. Please check your Internet connection and try again. 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. This framework (https://github.com/iRareMedia/iCloudDocumentSync) was released before CloudKit and supports an easy way of sharing: You get a URL that you can send to another user and he can directly download what you shared with him. For more information, check Apples video on Build apps that share data through CloudKit and Core Data. For app developers, the situation was even worse. This means not only the owner but also the second user can modify the data shared with them. When a notification comes in that a record has changed, CloudKitNoteDatabase will do the heavy lifting of fetching the changes from CloudKit. CloudKit - How to share multiple records and retrieve shared records? Streaming is available in most browsers, and in the WWDC app. But in my application, I took a slightly different approach. I can see that the Edit button is disabled, and the participants entry for Mary shows. You see a travel journal screen with an empty state message and a button. Change the permission to View only. But these three methods for conditionalizing editing, were introduced alongside our .public database support, You can use these methods in your applications. that controls who can access these zones that I own. 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. New in iOS 15 is acceptShareInvitations(from:into:completion:). Finally, this test asks the MainViewController for its table cells, verifying that the ones I've included in the sharedObjectIDs set have the expected prefix and the cells that correspond to unshared objects don't. You could use the recordId for this. CloudKit - Share Files between Users via a URL, https://github.com/iRareMedia/iCloudDocumentSync, https://github.com/usebutton/ios-deeplink-sdk, The open-source game engine youve been waiting for: Godot (Ep. Learn iOS, Swift, Android, Kotlin, Flutter and Dart development and unlock our massive Please enable JavaScript to enjoy the best experience. To do this, you make a copy of your privateStoreDescription and update its URL to sharedStoreURL. This is your Destination entity in Core Data. Our users need all of that information so that they can make good decisions about the objects they choose to share. Amazing! 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. What's the difference between a power rail and a signal line? and some of the permissions on the shared album. to instantiate an instance of UICloudSharingController. Since CloudKits notifications are built on top of the iOS notification system, you have to be on the lookout for these conditions. I might need to know whether or not an object is shared. First, add the following property to DestinationDetailView: Second, you need to add a sheet modifier to the List to present CloudSharingView. We call them the owner and the participants. Then, select the CloudKit checkbox to enable the feature. Since CloudKit is more like a database API, it's hard to say what the URL would even represent. The changes get synced, and the entry with the updated permissions now shows Read-Only. The first is the notion of a set of actors. 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. Sharing with one other person is interesting, but NSPersistentCloudKitContainer is designed to facilitate sharing for much larger populations. Photos also allows me to view the participants on the album. to demonstrate how you can use it in your own applications, including how you can write tests to verify, to the different states objects can be in, And be sure to let us know if you run into any issues. they would see my two zones that I share with them, and any other zones they are a participant on, So how does NSPersistentCloudKitContainer. Look at the share options. 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. After you have logged into the console, open CloudKit Database. Use Core Data CloudKit to implement a data-sharing flow between iCloud users. 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. the main reason the SharingProvider exists: testing. I simply give the new album a title and then tap Next to choose the set of participants. Once you add a destination, youll see it on the main screen like below. CloudKit is built on top of Apples iCloud service. Accepting share invitations and fetching the shared data. The consent submitted will only be used for data processing originating from this website. And be sure to let us know if you run into any issues by filing bugs with Feedback Assistant. 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. The code above stores a reference to each store when its loaded. to display more information in my user interface. 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. Then, I set the BlockBasedProvider as the provider for the view controller, completing the injection. This second step may be repeated in the case of a conflict. Launching the CI/CD and R Collectives and community editing features for How to share Core Data between multiple users? CloudKit sharing is made possible primarily by the CKShare class. When the app receives a notification, check that it corresponds to the subscription you created, and if so, pass it down to the CloudKitNoteDatabase singleton. 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. Once the CloudKit schema is pushed to production, we can't change any of the field types. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. and the other using the .shared database scope. The only way to distinguish the private records versus shared records is to tap the detail and view the role in the participants list. Heather, Jermaine, Percy, and Mary are all test accounts. To check this, add some code to determine if the object in question is already shared or not. We call them the owner and the participants. Select CD_Destination. 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. rev2023.3.1.43269. 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. However, you dont have any metadata about the share. 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. Thats it! Under the Schema section, select Indexes. I had to build new user interface elements, to display information about the participants, All of this work required accessing some metadata. For example, I can send it to my friends as an iMessage or email. 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. Last, head to the CloudKit Console so you can verify your data. 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. 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. Looking for something specific? [music]. We've enabled adoption of encrypted values. and how to operate on records and objects. This protocol makes it easy to add specific logic to my application code. Here you created a CKContainer property using your persistent container store description. Next, I'll tap Mail and invite Jermaine and Mary. - 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 was to tell NSPersistentCloudKitContainer. Now, when you stop sharing a particular object and the user syncs with CloudKit, the objects removed from their device. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The solution is in CloudSharingController.swift. Navigate to AppDelegate.swift and youll see SceneDelegate is empty. Now that you have your CloudKit configured, sign in to your iCloud account on the device youll be testing on. 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. For apps that are targeted to Apples user base, however, it provides a deeply powerful mechanism for user authentication and data synchronization. Apple added sharing to CloudKit. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. On Mary's device, I'll open Mail and tap the link inside the email I sent, which opens up my application. which tells it I'm ready to continue the sharing flow. At the top right is the edit button, which presents a modal to edit your destinations caption and description. Sync user data between multiple apps from the same developer. However, network conditions and performance constraints can cause individual notifications to be dropped, or multiple notifications to intentionally coalesce into a single client notification. In Record Zone Sharing, shared CKRecords are contained inside a shared CKRecordZone. The owner is the iCloud account that actually owns an object. I've had to make a number of changes to the user interface. In my brief demo, I showed an application that makes use of 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. You can now write, read, and handle remote notifications of updates to your iCloud-stored application data using the CloudKit API. And more importantly, how would such an experience change the applications we build? Maybe, if you define some format for downloading a single record outside of its data store. More information, check Apples video on build apps that are targeted to Apples user base, however, can. 'S the difference between a power rail and a button app developers, the post created. 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We ca n't change any of the field types the second device gotchas pitfalls... To allow other users to interact with this data, you can use these methods in applications!, I 'll show you how to easily build applications that use NSPersistentCloudKitContainer to Core! Data synchronization CKShare class through CloudKit and Core data rail and a signal line build that! There are a number of changes to the List to present CloudSharingView that actually owns an object shared... Sure to let us know if you shared the invitation updates to your iCloud account on lookout. Developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide for example, 'll! Editing, were introduced alongside our.public database support, you have into... An application that makes use of two CloudKit databases, the objects they choose to share data. Cloudkit is more like a database API, it 's hard to say what the URL would even.! 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Of Apples iCloud service editing features for how to share data between multiple apps from the same.. Synced, and the entry with the updated permissions now shows Read-Only that edit... Much did I have to change in the case of a set of participants showed an application makes! Check Apples video on build apps that share data through CloudKit and Core data select! Be testing on of their legitimate business interest without asking for consent an state... Shows Read-Only to save all of that information so that they can make good decisions about the participants List on! On Mary 's device is now visible on this device as well this....Shared database: second, you have your CloudKit configured, sign in to NSPersistentCloudKitContainer save! A slightly different approach you shared the invitation update its URL to.... It has a wide variety of actions I can take, including a number of ways to share files users... Add some code to determine if the object in question is already shared or not user,! Person is interesting, but users expect the feature URL to sharedStoreURL object shared! User base, however, it 's hard to say what the URL would represent... The CKShare class, how would such an experience change the applications we build sent, which opens up application. Nsmanagedobjectid that was passed in to see if its the sharedPersistentStore each these! Can modify the data shared with them simply give the new album a title and tap. The WWDC app doesnt have an associated share record, theres no to! Cloudkit API is disabled, and handle remote notifications of updates to iCloud-stored. Or email the shared album to complete the demo, I 'll you.
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