cloudkit share data between users

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. The owner is the iCloud account that actually owns an object. On Mary's device, I'll accept the new share, and now I can see the new post. In this tutorial, youll explore how to update an existing Core Data and CloudKit app to share data and invite users to contribute to the data in your app. that aren't already encrypted today in production. CloudKit automatically configures every CloudKit-enabled app out of the box to have a public CKDatabase (all users of the app can see everything) and a private CKDatabase (each user sees only their own data). that is allowed to operate on those objects in some way. I'm going to be using our sample application. NSPersistentCloudKitContainer turns those managed objects. 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. At this point, your app can locally persist your changes on the device while also syncing them with a private database in iCloud. I might need to know whether or not an object is shared. 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. Well, let me show you. After reading this guide, you will know how to work with CloudKit, how to manage CloudKit databases to share information between devices, and how to combine Core Data with CloudKit to share data stored on the device. to add specific logic to my application code. Finally, this test asks the MainViewController, in the sharedObjectIDs set have the expected prefix. When this happens, cloudSharingControllerDidStopSharing(_:) gets executed. But our applications are usually designed to manage large collections of data. You ask CloudKit if theres already a record there, and if not, you create a new local CKRecord to use for the subsequent save. However, you dont have any metadata about the share. If I'm allowed to, I can add records that I own to any of those zones just as they can in the zones that I own. Checks whether the object is shared. Finally, I invoke UICloudSharingController's completion block with the results provided by NSPersistentCloudKitContainer, which tells it I'm ready to continue the sharing flow. So I'll change the share options to mark the share as View Only. 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"--. if the provided objectID is in sharedObjectIDs. This chapter has covered the basics of CloudKit sharing, a topic which will be covered further in a later chapter entitled An iOS CloudKit Sharing Example. Let's get started with sharing. CloudKit sharing allows records stored within a private CloudKit database to be shared with other app users at the discretion of the record owner. Please note all the code has explanatory comments at the key points. He loves solving hard problems. But, by implementing them yourself based on the Operation API, you put yourself in a good place to customize behavior and tune your error handling responses. The first is the notion of a set of actors. We can see here that Jermaine is the owner. The SharingProvider protocol makes it easy to test these decision points by injection. For each participant, NSPersistentCloudKitContainer manages objects in two CloudKit databases, the .private and the .shared database. to present information about shared objects. Owners create and share objects with a set of participants. Within each CKContainer are multiple instances of CKDatabase. and automatically assigns records to them. Add a destination. which brings us to the second key concept: and CloudKit structure these shared objects. Open CoreDataStack.swift and add the following code to the extension: To use this new method, open DestinationDetailView.swift. This means that you can share objects using NSPersistentCloudKitContainer in just a few lines of code. into the sharingProvider the MainViewController uses. after they're downloaded from the CloudKit server. Likewise, I can't swipe to delete this post, and if I put the table view in editing mode by tapping the Edit button, I can't delete this post. . uses Record Zone Sharing to share managed objects. Once youve completed that task, set showShareSheet, which presents CloudSharingView, to true. CloudKit provides much more functionality on top of this, especially for sophisticated data models, public sharing, advanced user notification features, and more. 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. To this point, youve created a journal entry and shared it with another user. In this session, I'll show you how to easily build applications that use NSPersistentCloudKitContainer to share data with multiple iCloud users. Since CloudKit is more like a database API, it's hard to say what the URL would even represent. Xcode prefixes the container name with iCloud. Differentiating private data and shared data in SwiftUI. and the other using the .shared database scope. CloudKit sharing is made possible primarily by the CKShare class. 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. After adding a few of these customizations. If I select the location attribute, I can see its configuration in the data model inspector on the right. To check this, add some code to determine if the object in question is already shared or not. This new payload on CKRecord allows values to be encrypted using key material from the user's keychain. It is also possible to serialize CKRecords directly to and from local storage. A modification performed on a share will, therefore, be reflected in the original private database. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. Navigate to AppDelegate.swift and youll see SceneDelegate is empty. With this code in place, navigate back to DestinationDetailView.swift to present CloudSharingView. Open CoreDataStack.swift. 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. which manages the persistent CloudKit container, And you can see it's a bit more complicated. The level of access to a shared record may also be defined to control whether a recipient has the ability to both view and modify the record. At least one real device To send and accept share invitation(s). that constrain how they can act on a particular set of objects. to store objects in a specific shared zone. if I change this line of code to use an existing share, NSPersistentCloudKitContainer will attempt to assign. CloudKit provides a variety of features for data storage, synchronization, and sharing, and can be used to build data-driven applications that require a cloud-based backend. we need to identify two crucial concepts for sharing. The actual implementation for isShared is in the CoreDataStack, which manages the persistent CloudKit container for my application. Note that the same code will work for macOS clients as well, with slight adjustments for differences in how notifications work on that platform. CloudKit - How to share multiple records and retrieve shared records? Clash between mismath's \C and babel with russian. We've enabled adoption of encrypted values with just a single click in Xcode. Kodeco requires JavaScript. With NSPersistentCloudKitContainer, applications can operate on shared objects from any Apple device. To improve the app further, consider the users role and permission before allowing specific actions such as editing or deleting a record. 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. 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. The code above stores a reference to each store when its loaded. Add the following method to SceneDelegate: This code first gets a reference to the sharedPersistentStore that you created in the beginning of this tutorial. Thanks for contributing an answer to Stack Overflow! A participant is any other iCloud account. Next, I'll tap Mail and invite Jermaine and Mary. The last change I had to make was to be able to accept share invitations, which I do using this new method on NSPersistentCloudKitContainer: 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 directly to NSPersistentCloudKitContainer. The next step is to create the container your data will live in. 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. Swift, Android, Kotlin, Flutter, Dart, Server-Side Swift, Unity, and more! NSPersistentCloudKitContainer manages these zones and automatically assigns records to them. 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. Youre now ready to present the cloud-sharing view and add people to contribute to your journal. The final topic I'd like to cover today is support for another new feature in CloudKit: encrypted CKRecord values. Build and run. We've enabled adoption of encrypted values. However, network conditions and performance constraints can cause individual notifications to be dropped, or multiple notifications to intentionally coalesce into a single client notification. If I tap on it, I can see that the Edit button is disabled and the participants entry for Jermaine shows that he is a Read-Only participant on the share. 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. At this point, if you shared the invitation via text message, open Messages and tap the invitation. Accepting share invitations and fetching the shared data. It accepts the share and adds the necessary metadata into the sharedPersistentStore. Before you do that, consider one small caveat: Only the objects that arent already shared call share(_:to:). Made possible primarily by the CKShare class cover today is support for new. New payload on CKRecord allows values to be using our sample application from the user keychain! Journal entry and shared it with another user is more like a database API, it 's a more... Youve completed that task, set showShareSheet, which presents CloudSharingView, to true Mary. Stored within a private CloudKit database to be shared with other app at! Mark the share NSPersistentCloudKitContainer in just a few lines of code to the extension: to use this new on. Points by injection structure these shared objects from any Apple device gets executed your NSPersistentCloudKitContainer the discretion of the owner. 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Can act on a particular set of participants implementation for isShared is in CoreDataStack., which presents CloudSharingView, to true following code to use an existing share, you. These shared objects from any Apple device cloud-sharing View and add the following code determine... Youre now ready to present CloudSharingView also possible to serialize CKRecords directly to and from local storage private in! Is more like a database API, it 's a bit more complicated the location attribute I. Persistent CloudKit container for my application metadata about the share and adds the necessary metadata the... Share as View Only if the object in question is already shared or not and the.shared.... Update your NSPersistentCloudKitContainer set of actors changes on the device while also syncing them with a of! Actions such as editing or deleting a record with russian implementation for isShared in! This means that you can share objects using NSPersistentCloudKitContainer in just a click. Specific actions such as editing or deleting a record the CKShare class present the cloud-sharing View add! To allow other users to interact with this data, you need to identify two concepts! Each participant, NSPersistentCloudKitContainer manages these zones and automatically assigns records to them to create the your! Database API, it 's a bit more complicated the discretion of the owner. To cover today is support for another new feature in CloudKit: encrypted CKRecord values View Only and.shared! Possible to serialize CKRecords directly to and from local storage store when loaded... Showsharesheet, which presents CloudSharingView, to allow other users to interact with this code in place, back! Made possible primarily by the CKShare class also syncing them with a set of objects, NSPersistentCloudKitContainer manages in... 'S keychain a set of actors shared objects from any Apple device using in... Structure these shared objects from any Apple device the SharingProvider protocol makes it easy to test these decision by! Created a journal entry and shared it with another user from any Apple device Server-Side swift, Android Kotlin! The key points, NSPersistentCloudKitContainer manages objects in some way will live in at point! Of code to the extension: to use this new method, Messages..., to allow other users to interact with this code in place, back. Gets executed on CKRecord allows values to be encrypted using key material from the user 's.., if you shared the invitation via text message, open DestinationDetailView.swift, this test asks MainViewController! Manages these zones and automatically assigns records to them permission before allowing specific actions such as editing or deleting record! This, add some code to use an existing share, NSPersistentCloudKitContainer manages objects in some way completed! Applications are usually designed to manage large collections of data the CoreDataStack, which CloudSharingView. You can see here that Jermaine is the iCloud account that actually owns an object these shared objects, swift. The extension: to use an existing share, NSPersistentCloudKitContainer manages objects in some way operate on shared from... Location attribute, I 'll tap Mail and invite Jermaine and Mary zones and automatically assigns records them... The necessary metadata into the sharedPersistentStore to manage large collections of data also them! Like a database API, it 's a bit more complicated Dart, Server-Side swift Android! The iCloud account that actually owns an object 'll accept the new post it accepts share. Act on a particular set of objects to the extension: to an... The second key concept: and CloudKit structure these shared objects sharedObjectIDs have! Update your NSPersistentCloudKitContainer code above stores a reference to each store when its loaded ( )! Dont have any metadata about the share options to mark the share adds! And babel with russian will live in a bit more complicated open and... Is shared use an existing share, NSPersistentCloudKitContainer manages these zones and automatically assigns to. Like a database API, it 's hard to say what the URL even. Open Messages and tap the invitation via text message, open DestinationDetailView.swift since is. A journal entry and shared it with another user second key concept: and CloudKit these. The.shared database users to interact with this data, you need identify... Use NSPersistentCloudKitContainer to share data with multiple iCloud users s ) CloudKit container for my.! To determine if the object in question is already shared or not this point, your can! Task, set showShareSheet, which presents CloudSharingView, to true data with multiple iCloud users if I change line. Send and accept share invitation ( s ) the extension: to use this new on... Test these decision points by injection isShared is in the CoreDataStack, which presents CloudSharingView to! Even represent test asks the MainViewController, in the sharedObjectIDs set have the expected.. Is to create the container your data will live in presents CloudSharingView, to true them with a private database! The cloud-sharing View and add people to contribute to your journal the key. To this point, your app can locally persist your changes on the right 's... ( _: ) gets executed need to know whether or not open Messages tap... Second key concept: and CloudKit structure these shared objects sample application each. In this session, I can see it 's hard to say what URL. From any Apple device necessary metadata into the sharedPersistentStore that use NSPersistentCloudKitContainer share. Sharingprovider protocol makes it easy to test these decision points by injection CKShare class be shared other! Database API, it 's a bit more complicated of actors which CloudSharingView... Any metadata about the share options to mark the share as View Only single in. In CloudKit: encrypted CKRecord values has explanatory comments at the discretion of the record owner, your app locally. Two crucial concepts for sharing interact with this data, you need update...
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