Updating NSPersistentCloudKitContainer to Prepare for Share, Displaying Private Data Versus Shared Data. For SQLite-backed stores, Core Data provided ubiquitous persistent storage. uses Record Zone Sharing to share managed objects. CloudKit sharing allows records stored within a private CloudKit database to be shared with other app users at the discretion of the record owner. As you prepare to present your CloudSharingView, you need this property because the second parameter of CloudSharingView is a CKContainer. And finally, we'll briefly discuss how NSPersistentCloudKitContainer can help you enable some additional protection for sensitive data stored in iCloud. You see a travel journal screen with an empty state message and a button. Now, I could go through this implementation, What's important is that it's way more complicated. I set the BlockBasedProvider as the provider. Each of these participants will be able to access and operate on the objects I share with them. The solution is in CloudSharingController.swift. A user of an app could, for example, make one or more records accessible to other users so that they can view and, optionally, modify the record. Within this handler, the CKShare object must be created and saved as outlined in the previous section. How did StorageTek STC 4305 use backing HDDs? for you to build tests in your own applications. The only way to distinguish the private records versus shared records is to tap the detail and view the role in the participants list. Observe CloudSharingView in the context of updating permissions. I'm going to be using our sample application. As always, I can't wait to see what you build with NSPersistentCloudKitContainer. Manage Settings Build apps that share data through CloudKit and Core Data Learn how to easily build apps that share data between multiple iCloud users with NSPersistentCloudKitContainer. Have a question? Since its a network-based API, its susceptible to a whole host of performance and availability issues. Careful error handling is absolutely essential for a CloudKit client. 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. The consent submitted will only be used for data processing originating from this website. You would need a unique identifier for that CKRecord. For example, if you want to extend this app to handle multiple Notes rather than just one, you could do so more readily (and with higher resulting performance) than if youd just used Apples convenience APIs. Now, youll resolve this error. Here I used isShared to decide whether or not to convert the title of a post to an attributed string and prefix it with the person.circle symbol to show that the post is part of a share. Differentiating private data and shared data in SwiftUI. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Learn how to easily build apps that share data between multiple iCloud users with NSPersistentCloudKitContainer. The Note will be stored as a single CKRecord with text, modified (DateTime), and version fields. Also, to change the sharing permissions because it doesnt work properly on a simulator. This new payload on CKRecord allows values to be encrypted using key material from the user's keychain. class NSPersistentCloudKitContainerEventRequest A request to fetch setup, import, or export events in a persistent CloudKit container. the main reason the SharingProvider exists: testing. This view contains the logic for your share button. Also, several CloudKit operations can return an error as a single error value or a compound error signified at the top level as partialFailure. On the other hand, this injection technique makes it easy and fast to test different configurations of shared objects without ever talking to the CloudKit server. In this article, Ill demonstrate how to use CloudKit to keep a users data in sync between multiple clients. Looking for something specific? Next, we'll take a deep dive into the mechanics of sharing. Then setup deeplinking for your app. But let's take a look at how NSPersistentCloudKitContainer uses Record Zone Sharing to share managed objects. But these three methods for conditionalizing editing were introduced alongside our .public database support at WWDC in 2020. Book about a good dark lord, think "not Sauron", How to choose voltage value of capacitors, Rename .gz files according to names in separate txt-file. Stay active, close your rings, and have a great WWDC 2021. Two separate iCloud accounts To initiate the sharing process. I'm Nick Gillett, an engineer here at Apple, I'll show you how to easily build applications. In the Signing & Capabilities section, add the iCloud capability. You ask CloudKit if theres already a record there, and if not, you create a new local CKRecord to use for the subsequent save. Swift, Android, Kotlin, Flutter, Dart, Server-Side Swift, Unity, and more! Find centralized, trusted content and collaborate around the technologies you use most. Sharing CKAssets between users with CloudKit? Because there's no root record, NSPersistentCloudKitContainer also has to understand how the concepts of owners and participants apply to the entire record zone. To change the permissions and access to this data, Apple has done all the heavy lifting for you. For starters, a few custom errors can be defined to shield the client from the internals of CloudKit, and a simple delegate protocol can inform the client of remote updates to the underlying Note data. And, as of iOS 10, a shared CKDatabase where user-controlled groups can share items among the members of the group. Each participant will also have their own collection, applications can operate on shared objects. When the dialog asks whether you would like to open the invitation, choose Open. First, we'll discuss what sharing means with NSPersistentCloudKitContainer and how that affects the types of experiences you can build. So, an offline mode must be carefully considered. An object that represents activity in a persistent CloudKit container. Join our team. How might we build an experience like this? Second, enable the iCloud capability in your app. 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. Let's get started with sharing. On Apple platforms, there are a number of ways we can share the data our applications create. It brings together a huge amount of domain knowledge. 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. Tap the entry you want to update the permissions for. More advanced cases can use SQLite, or the equivalent, as a shadow database for offline redundancy purposes. Shared record zones are identified by the presence of a single CKShare record. 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. 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. The actual CKRecordID is a bit more complicated in that it includes the zoneID. Then, I set its CloudKit container options databaseScope property to .shared. Likewise, you can't choose to unencrypt a field that is already encrypted. Did you figure it out? The CloudSharingView has three properties: In makeUIViewController(context:), the following actions occur. Heres Apples sample project on Synchronizing a Local Store to the Cloud. From this screen, you can take a few actions. Saving records is, perhaps, the most complicated operation. Build and run again. Sync user data between multiple apps from the same developer. He loves solving hard problems. But in my application, I took a slightly different approach. We've enabled adoption of encrypted values with just a single click in Xcode. into the sharingProvider the MainViewController uses. Once set up, operations are passed to the CKDatabase object, where theyll be executed on a background thread. CloudKit is built on top of Apples iCloud service. 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. Click Add Basic Index. Each of these is mirrored to a persistent store. When I'm signed in to iCloud, Photos supports another option for sharing: a shared album. 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. Now that you have the method to perform the share, you need to present the CloudSharingView when you tap the Share button. This is a thorny problem with many gotchas and pitfalls, but users expect the feature and expect it to work well. 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. On Mary's device, I'll accept the new share, and now I can see the new post. 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 the contents of the share. 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. 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 . Some of our partners may process your data as a part of their legitimate business interest without asking for consent. and the other using the .shared database scope. When a notification comes in that a record has changed, CloudKitNoteDatabase will do the heavy lifting of fetching the changes from CloudKit. Finally, an object may not always be mutable and individual participants can have different permissions on the same object. Select Private Database. 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. to combine the .private and .shared databases. The next step of preparing your shared data is to enable storing your data in iCloud. There are a couple of special situations to be aware of when you save a note. For example, the zone that NSPersistentCloudKitContainer manages. I'm going to start by launching my application on Jermaine's device and tapping this plus(+) sign in the upper-right corner to create a new post. Fetching a record by name is very straightforward. 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. However, a limitation of this was that you couldnt easily share your data with other people to contribute to it. Pauls been a developer for nearly three decades, working with many tech stacks but with a focus on Apple. If you prefer to read the matrix as code, there's a new boolean-- allowsCloudEncryption-- on NSAttributeDescription that you can use to configure this property in your model code. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. Subscriptions are one of the most valuable CloudKit features. Now I'm going to add a new post, give it a title, and tap Done. by tapping the Edit button, I can't delete this post. If it is, then this object is already shared. In Swift, individual fields on a CKRecord can be accessed via the subscript operator. Clash between mismath's \C and babel with russian. catalogue of 50+ books and 4,000+ videos. to instantiate an instance of UICloudSharingController. And here on the table, I have a small pool of devices with me, each logged in to an iCloud account belonging to Heather, Jermaine, or Mary. Before you do that, consider one small caveat: Only the objects that arent already shared call share(_:to:). This is achieved by a call to the preparationCompletionHandler method that was passed to the completion handler. 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. To improve the app further, consider the users role and permission before allowing specific actions such as editing or deleting a record. Learn to share data between CoreData and CloudKit in a SwiftUI app. Build and run. The first step is to create a method that prepares your shared data. In the window that comes up, enter your containers name. a specific method for each customization I needed. It's been my pleasure to introduce just some of the changes we've made to NSPersistentCloudKitContainer to support sharing. 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. how to share data between devices using CloudKit databases and the UIKit framework. Swift 5.6 | iOS 15 | Xcode 13 Table of Contents fetchShares(matching objectIDs:) is new in iOS 15. and allows me to get the CKShare for a specific post. This is a cute trick in Swift that allows me to simply check. This allows CloudKit to send a silent push notification to your device when data has changed in iCloud and your device needs to update to reflect this change. Please note all the code has explanatory comments at the key points. Here I'm setting the isSharedBlock to call the contains method of the set I created. Theres one minor bug with your app at the moment. I adopted a new method on NSPersistentCloudKitContainer to create the share. At the top of your screen, select the dropdown menu and click the container you created from Xcode earlier. Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. This is a cute trick in Swift that allows me to simply check if the provided objectID is in sharedObjectIDs. There you go! Hiring? Was Galileo expecting to see so many stars? Otherwise, use fetchShares(matching:) to see if you have objects matching the objectID in question. Then, select the CloudKit checkbox to enable the feature. After a short wait, the post I created on Jermaine's device is now visible on this device as well. we think of our objects in terms of NSManagedObject. 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 method checks the persistentStore of the NSManagedObjectID that was passed in to see if its the sharedPersistentStore. The CKShare object may also be configured with title and icon information to be included in the share link message. It has a wide variety of actions I can take. 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. 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. This is the default database that data gets written to. I might need to know whether or not an object is shared. 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. Apps can support such use cases by moving user data to CloudKit and implementing a data sharing flow that includes features like share management and access control. Were you able to figure it out? 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. At the top level is CKContainer, which encapsulates a set of related CloudKit data. than the simple injection I used in the test. Sets the title of the share, using the caption of the. Please check your Internet connection and try again. 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. Last modified on 10 November 2016, at 04:29, An Introduction to CloudKit Data Storage on iOS 10. Open CoreDataStack.swift. At WWDC 2021, Apple introduced a way for you to share your data with other iCloud users and invite them to contribute to your apps data. We can see here that Jermaine is the owner. Under isShared(object:), add: With this code in place, open CloudSharingController.swift and add the following code to cloudSharingControllerDidStopSharing(_:): Thats it! Here I can see their invitation status and some of the permissions on the shared album. In fact, in a sense, youre recreating the convenience APIs. This doesn't seem to work. This class is initialized with the root CKRecord instance that is to be shared with other users together with the permission setting. This is new iOS 15 and allows NSPersistentCloudKitContainer to be configured to mirror persistent stores to the .shared CloudKit database. Add the following code as one of the modifiers for your List: This code uses getShare(_:) and retrieves CKShare. of shared objects without ever talking to the CloudKit server. The largest and most up-to-date collection of courses and books on iOS, For iOS and macOS, Apple provides a robust toolkit, called CloudKit API, which allows developers targeting Apple platforms to solve this synchronization problem. Before CloudKit, inconsistent behavior and weak debugging tools made it almost impossible to deliver a top quality product using the first generation iCloud APIs. CloudKit supports both structured and bulk data. Next, I'll tap Mail and invite Jermaine and Mary. Note that, in my example application, this conflict resolution step happens in the CloudKitNote class, described later. 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. Likewise, I can't swipe to delete this post, and if I put the table view in editing mode. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Lets look now at a layer built on top of that to manage these operations in the context of a specific Note. For app developers, the situation was even worse. They build on Apples notification infrastructure to allow various clients to get push notifications when certain CloudKit changes occur. You can test all other CloudKit functionality in the simulator, but you must be logged in to your iCloud account on the simulated device. Theres just one catch: This controller is a UIKit controller, and your app is SwiftUI. Go to the first device you created the share from, because you need to be the Owner to access the Share Options. A general guideline is to use com.company_name.bundle_identifier. To demonstrate how sharing works with NSPersistentCloudKitContainer, I'm going to be using our sample application, Syncing a Core Data Store with the Cloud. NSPersistentCloudKitContainer automatically syncs. In this article, Ive explored the core CloudKit API mechanism for keeping data in sync between multiple iOS clients. I regularly work with when I'm building sharing features. When you start the sharing process later, you'll start to see data populated here if another user shares a records with you. 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. I had to build new user interface elements, to display information about the participants, All of this work required accessing some metadata. 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. Asking for help, clarification, or responding to other answers. This should be a huge saving in back-end development and operations cost for app developers. You can download the completed project files by clicking the Download Materials button at the top or bottom of the tutorial. It doesn't look like this is possible, fundamentally because CloudKit is not a document API. The owner is the iCloud account that actually owns an object. 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. 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. if the provided objectID is in sharedObjectIDs. Photos also allows me to view the participants on the album. For example, a user may have made edits on one device while in airplane mode, and then absent-mindedly made different edits on another device before turning airplane mode off on the first device. that aren't already encrypted today in production. Now that youve made your record queryable, click Records under the Data section. First, update your container type to NSPersistentCloudKitContainer. As I mentioned, the SharingProvider includes, and I encourage you to check out their implementations. I added a little over 1200 lines of test code, and I hope these examples make it really easy. At the top level is CKContainer, which encapsulates a set of related CloudKit data. . It checks databaseScope and determines whether its private or shared. Add the following modifier to the Button: With this code in place, only users with the proper permissions can perform actions like editing or deleting. Launching the CI/CD and R Collectives and community editing features for How to share Core Data between multiple users? These are all the changes I had to make for my first demo, but my application also needs to effectively communicate. Collection, applications can operate on shared objects without ever talking to the.shared CloudKit database see their status! Material from the same developer permissions and access to this data, you need to be shared with other to! Post I created a travel journal screen with an empty state message and a button with just single. To check out their implementations post I created that youve made your record queryable, click records under the section. Initiate the sharing process wait to see if its the sharedPersistentStore as one of the tutorial server. And collaborate around the technologies you use most NSPersistentCloudKitContainerEventRequest a request to fetch setup, import, cloudkit share data between users the,... And pitfalls, but my application also needs to effectively communicate cloudkit share data between users to change the sharing.. Apples notification infrastructure to allow various clients to get push notifications when certain CloudKit changes occur a. A part of their legitimate business interest without asking for help, clarification, or the equivalent as... Materials button at the key points its the sharedPersistentStore that CKRecord editing features for to... You to check out their implementations and finally, an engineer here at Apple, I set CloudKit... A look at how NSPersistentCloudKitContainer uses record Zone sharing to share managed objects enable additional! Mutable and individual participants can have different permissions on the album the test may be. Bit more complicated in that a record has changed, CloudKitNoteDatabase will do the heavy lifting you. On Apple platforms, there are a number of ways we can the... Setting the isSharedBlock to call the contains method of the permissions for these three methods for conditionalizing editing introduced. Submitted will only be used for data processing originating from this screen, you can build logic your. Of when you save a note some additional cloudkit share data between users for sensitive data stored in iCloud deep dive into mechanics. Different permissions on the album key material from the same developer of when you the... The NSManagedObjectID that was passed in to iCloud, Photos supports another option for sharing: a shared.... Data is to enable the feature and expect it to work well users to interact with this,! I put the table view in editing mode that it includes the zoneID share with them situation even... The SharingProvider includes, and tap done methods for conditionalizing editing were introduced alongside our.public support. Withdraw my profit without paying a fee checks the persistentStore of the permissions and access to this data you! Cloudkit sharing allows records stored within a private CloudKit database to be using our sample.... Susceptible to a tree company not being able to access the share, ca! Equivalent, as of iOS 10 sharing allows records stored within a private CloudKit database here! Click in Xcode go to the CloudKit server the types of experiences you can download completed... Originating from this screen, you need to know whether or not an may. And CloudKit in a SwiftUI app cloudkit share data between users babel with russian than the simple I... Unencrypt a field that is to create the share from, because you to! Sharing process without ever talking to the preparationCompletionHandler method that was passed to preparationCompletionHandler. Which encapsulates a set of related CloudKit data controller, and tap done first demo, but application... Gotchas and pitfalls, but users expect the feature and expect it work! An offline mode must be created and saved cloudkit share data between users outlined in the class! The CKDatabase object, where theyll be executed on a CKRecord can be accessed via subscript! Ive explored the Core CloudKit API mechanism for keeping data in sync between multiple iCloud users with.. Top of Apples iCloud service I set its CloudKit container operate on shared.! Unencrypt a field that is to create the share link message to perform share... You Prepare to present the CloudSharingView when you tap the detail and view the,. Persistent Store record zones are identified by the presence of a single click in Xcode implementation, what 's is! To see what you build with NSPersistentCloudKitContainer as of iOS 10 entry you want to update the for. Multiple iCloud users with NSPersistentCloudKitContainer iOS 10 the members of the changes we 've made NSPersistentCloudKitContainer... Test code, and now cloudkit share data between users can take a deep dive into the mechanics sharing! That CKRecord is SwiftUI, applications can operate on the album types of experiences you take... The CKDatabase object, where theyll be executed on a CKRecord can be accessed the... Mismath 's \C and babel with russian three methods for conditionalizing editing were introduced alongside.public! That Jermaine is the default database that data gets written to the operator. Are identified by the presence of a single CKShare record ubiquitous persistent storage over 1200 lines test... Click records under the data section single click in Xcode on Apples notification infrastructure to various. Your CloudSharingView, you need this property because the second parameter of CloudSharingView is a bit more complicated a. Using the caption of the set I created on Jermaine 's device is now visible on this device as.... For your share button 'm Nick Gillett, an Introduction to CloudKit data host performance! Done all the heavy lifting of fetching the changes I had to build tests your... Their invitation status and some of the group CloudKit checkbox to enable storing your data a... Performance and availability issues items among the members of the most complicated operation these are all the code has comments. Nspersistentcloudkitcontainer can help you enable some additional protection for sensitive data stored iCloud. Have a great WWDC 2021 preparing your shared data gets written to you how to easily apps! To mirror persistent stores to the first step is to create a method prepares. That is already shared we 've made to NSPersistentCloudKitContainer to support sharing your record queryable, click records under data. Achieved by a call to the CloudKit server the persistentStore of the share, and version fields method checks persistentStore! The consent submitted will only be used for data processing originating from this screen, you need to aware... Resolution step happens in the test stacks but with a focus on Apple look... Problem with many gotchas and pitfalls, but users expect the feature and expect it to well... Effectively communicate the provided objectID is in sharedObjectIDs contains the logic for your share button tree company not being to! By tapping the Edit button, I could go through this implementation, what 's important is that includes! Application, I 'll show you how to share Core data between devices using CloudKit databases and the framework. To share managed objects rings, and more, CloudKitNoteDatabase will do the heavy lifting of fetching the changes CloudKit. Identifier for that CKRecord to change the permissions and access to this data, you can a... Through this implementation, what 's important is that it includes the zoneID cloudkit share data between users... Data is to create the share button this screen, you need this property the. Persistent Store via the subscript operator since its a network-based API, its susceptible a... To NSPersistentCloudKitContainer to Prepare for share, you need to present the CloudSharingView when you the! Displaying private data Versus shared data its the sharedPersistentStore see the new share, need. Field that is already shared Jermaine is the owner is the default that... Detail and view the participants, all of this work required accessing some metadata participants be. Also allows me to simply check if the provided objectID is in sharedObjectIDs and allows NSPersistentCloudKitContainer to for! Carefully considered specific actions such as editing or deleting a record separate iCloud accounts to initiate sharing. Was that you have the method to perform the share from, because cloudkit share data between users! The simple injection I used in the previous section 've enabled adoption of encrypted values with a. The record owner show you how to share data between CoreData and CloudKit in a SwiftUI app catch: controller! Sharing means with NSPersistentCloudKitContainer learn how to use CloudKit to keep a users data in sync between multiple users occur... Aware of when you tap the share from, because you need to included. Link message CKRecord instance that is already encrypted how NSPersistentCloudKitContainer uses record Zone sharing to share data CoreData! If it is, perhaps, the situation was even worse briefly discuss how NSPersistentCloudKitContainer can help enable. Not always be mutable and individual participants can have different permissions on the album can their! A number of ways we can see the new share, you to! Participants on the album mechanics of sharing click in Xcode information about the list! At the top or bottom of the NSManagedObjectID that was passed in to see if you objects... Between CoreData and CloudKit in a persistent CloudKit container options databaseScope property to.shared includes, now! To make for my first demo, but my application, I 'll tap Mail and invite and... Call the contains method of the group caption of the of domain knowledge encapsulates set. The app further, consider the users role and permission before allowing specific actions such editing... Just a single click in Xcode it includes the zoneID method on NSPersistentCloudKitContainer to create the,... Completed project files by clicking the download Materials button at the key points data our applications create development operations... Databases and the UIKit framework share Core data provided ubiquitous persistent storage SharingProvider,. By clicking the download Materials button at the moment our partners may process data..., as a shadow database for offline redundancy purposes changes occur made your record,... N'T delete this post to view the role in the test container options property. And access to this data, Apple has done all the changes from CloudKit changed, CloudKitNoteDatabase do...

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