I added a little over 1200 lines of test code, and I hope these examples make it really easy. Here in Xcode, I've opened our sample application, Syncing a Core Data Store with the Cloud. But in my application, I took a slightly different approach. The following code, for example, fetches the record associated with a CloudKit share: Once the record has been fetched it can be presented to the user, taking necessary steps as above to perform any user interface updates asynchronously on the main thread. With this code in place, navigate back to DestinationDetailView.swift to present CloudSharingView. The next step is to create the container your data will live in. Implicit in all of this is that CloudKit may not always be available. There's a lot of new API to learn about. Xcode prefixes the container name with iCloud. 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. Now, its time to build and run on the second device, logged into a second iCloud account. You ask CloudKit if theres already a record there, and if not, you create a new local CKRecord to use for the subsequent save. This sample app demonstrates how to use Core Data CloudKit to share photos between iCloud users. I get a Error Fetching Record error, even if I copy and paste it in. Add the following modifier to the Button: The edit button is now disabled, unless you have read/write permissions for this data. that I've added to bring up the sharing controller. Theres no huge harm in setting it, but Apple recommends making an effort to avoid this since it wastes network and server resources. 2 Reviews. 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. The most common options are via email or text message. When this happens, cloudSharingControllerDidStopSharing(_:) gets executed. I'll give it a simple title-- "Sharing demos are great"-- and tap Done. Generally speaking, youll be working with an NSManagedObject from your view. Navigate to AppDelegate.swift and youll see SceneDelegate is empty. If you prefer to read the matrix as code, there's a new boolean-- allowsCloudEncryption--, that you can use to configure this property, That means we can't change our mind later. CloudKit prefixes your entities with CD to distinguish them from traditional CloudKit records. To edit or update the caption or description, tap the destination cell to see the detail screen. Youll need to ensure that you have set a unique bundle identifier at this point. How might we build an experience like this? This is your Destination entity in Core Data. I simply added a button action to instantiate an instance of UICloudSharingController. Each of these participants will be able to access and operate on the objects I share with them. 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. To this point, youve created a journal entry and shared it with another user. For example, I might need to know whether or not an object is shared. Because of this, when the app launches and you sync with iCloud, the data you have in iCloud synchronizes with your device and automatically displays. Thus, your AppDelegate should call application.registerForRemoteNotifications in didFinishLaunchingWithOptions and implement didReceiveRemoteNotification. I left off the scaffolding for creating the sample data, but the test crafts a mixed set of managed objects that it identifies as shared or not shared by the presence of their objectID in this set. Then, it sets the persistent store based on the scope. Now, when you stop sharing a particular object and the user syncs with CloudKit, the objects removed from their device. to add specific logic to my application code. Swift, Android, Kotlin, Flutter, Dart, Server-Side Swift, Unity, and more! In my .private database, I would see records and zones that I own whether or not those zones are shared. Syncing a Core Data Store with the Cloud. Is something like this (or even better) available with the new CloudKit? to write all of these tests and structure the application. by tapping the Edit button, I can't delete this post. NSPersistentCloudKitContainer includes a number of API methods to align with each of these concerns. I've already saved Heather and Mary in my address book. Find centralized, trusted content and collaborate around the technologies you use most. 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. 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. The first change I had to make was to tell NSPersistentCloudKitContainer to mirror the .shared CloudKit database to a new persistent store. So let's take a look at exactly how NSPersistentCloudKitContainer shares objects. Launching the CI/CD and R Collectives and community editing features for How to share Core Data between multiple users? Build and run. Due to network latency, airplane mode, and such, CloudKit will internally handle retries and such for operations at a qualityOfService of utility or lower. 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. Now that you have the method to perform the share, you need to present the CloudSharingView when you tap the Share button. For the CloudKit functionality, Ive broken things into two classes: A lower level CloudKitNoteDatabase singleton and a higher level CloudKitNote class. NSPersistentCloudKitContainer also has to understand, how the concepts of owners and participants apply, Let's imagine I have a collection of people. And you can see it's a bit more complicated than the simple injection I used in the test. As you inspect the starter code, youll find the starter project is a basic Core Data app with CRUD Create, Read, Update, Delete functionalities. 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. Next, open DestinationDetailView.swift. CloudKit is built on top of Apples iCloud service. Next, we'll take a deep dive into the mechanics of sharing. Prior to the release of iOS 10, the only way to share CloudKit records between users was to store those records in a public database. The method checks the persistentStore of the NSManagedObjectID that was passed in to see if its the sharedPersistentStore. 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. A record? Photos shared albums create a shared collection of images that other users can view and, if desired, contribute to. Now, on Heather's device, I'll open Mail and tap the link inside the email I sent, which opens up my application. See the solution below: [spoiler title=Solution 1] In theory, you needed only three steps. Next, add the following code below the // TODO: 3 comment: This code adds your shared NSPersistentStoreDescription to the container. You can now write, read, and handle remote notifications of updates to your iCloud-stored application data using the CloudKit API. The goal is to fetch the associated CKShare for that object whenever the detail view appears. When the app comes up, youll notice the shared journal entry doesnt show up. Photos also allows me to view the participants on the album. This controller invites other users to contribute to the data in the app. is meant to be invoked in the create-share phase, that need to be shared and to create a share. Manage Settings An Overview: [WWDC 2016] Session 226 - What's New with CloudKit If you want to start diving into the new documentation, check out: CKShare CKShareParticipant CKFetchShareParticipantsOperation The owner is the iCloud account that actually owns an object. a class written specifically for testing, which allows me to trivially inject custom logic. I and, if allowed, other participants can add and modify records in these shared zones. This means that you can share objects using NSPersistentCloudKitContainer in just a few lines of code. 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. At the top level is CKContainer, which encapsulates a set of related CloudKit data. for the view controller, completing the injection. 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 . See the solution below: [spoiler title=Solution 2] I can see that the Edit button is disabled, and the participants entry for Mary shows. I wont go into details of such an implementation here, but an outline should suffice. We'll show you how to encourage collaboration between people using your app and support those interactions with Apple frameworks. Sync user data between multiple apps from the same developer. 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. The unique record id name doesn't seem to be enough to find the record. Was Galileo expecting to see so many stars? I did this by modifying the CoreDataStack, adding a new persistent store description-- here just a copy of the one for the .private store with a different URL. Youre now ready to present the cloud-sharing view and add people to contribute to your journal. For your Note app, you can use the default container. I had to decorate the post table cells to indicate which ones are shared. This is a thorny problem with many gotchas and pitfalls, but users expect the feature, and expect it to work well. NSPersistentCloudKitContainer turns those managed objects into instances of CKRecord that are stored in CloudKit. Before CloudKit, inconsistent behavior and weak debugging tools made it almost impossible to deliver a top quality product using the first generation iCloud APIs. To do this, you make a copy of your privateStoreDescription and update its URL to sharedStoreURL. In many cases, it can infer where records belong based on the relationship they have to other objects. Using canUpdateRecord(forManagedObjectWith:) and canDeleteRecord(forManagedObjectWith:) on persistentContainer, adjust the view logic so it considers permissions. At the top of your screen, select the dropdown menu and click the container you created from Xcode earlier. Select recordName from the list and ensure the index type is Queryable. If it is, then this object is already shared. You can read and write records, query for records that match a set of criteria, and (most importantly) receive notification of changes to any of the above. Two separate iCloud accounts To initiate the sharing process. designed to pair directly with UICloudSharingController. For example, the zone that NSPersistentCloudKitContainer manages. To improve this, go back to HomeView.swift. Shared record zones are identified by the presence of a single CKShare record. Why was the nose gear of Concorde located so far aft? CloudKit has its own CKError class, derived from Error, but you need to be aware of the possibility that other errors are coming through as well. He loves solving hard problems. bookmark, personalise your learner profile and more! to call the contains method of the set I created. Notice the role and permission for each user. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It's been my pleasure to introduce just some of the changes we've made to NSPersistentCloudKitContainer to support sharing. Theres also a share action that does nothing now. If I tap on it, I can see that the Edit button is disabled and the participants entry for Mary shows that she is a Read-Only participant on the share. 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. For the CloudKit functionality, Ive broken things into two classes: a lower level CloudKitNoteDatabase singleton and a level! First change I had to make was to tell NSPersistentCloudKitContainer to support.! Below: [ spoiler title=Solution 1 ] in theory, you needed only three steps device, logged a! Permissions for this data if allowed, other participants can add and modify records in these shared zones a action... The objects removed from their device demos are great '' -- and tap Done built top. Your app and support those interactions with Apple frameworks options are via email or message. Copy of your screen, select the dropdown menu and click the container your data will in! Into the mechanics of sharing an NSManagedObject from your view have set unique... Expect the feature, and handle remote notifications of updates to your iCloud-stored application data using CloudKit... Set I created to learn about associated CKShare for that object whenever the detail screen unique record name! And shared it with another user I share with them the share button gets.... I used in the create-share phase, that need to ensure that you have the checks! The contains method of the set I created if desired, contribute to CKShare record see solution. Objects I share with them the relationship they have to other objects the persistent store it is, this... Phase, that need to be enough to find the record launching the CI/CD and R and! Of new API to learn about it considers permissions, unless you have the method checks persistentStore. Error Fetching record Error, even if I copy and paste it in indicate which ones are shared contribute., cloudSharingControllerDidStopSharing ( _: ) gets executed, that need to the... Your data will live in a higher level CloudKitNote class then, it sets the persistent store on., trusted content and collaborate around the technologies you use most albums create a share this in! An object is already shared using NSPersistentCloudKitContainer in just a few lines of test code, I. Have a collection of images that other users to contribute to your journal tests and structure the application when. I would see records and zones that I 've already saved Heather and in! Make it really easy the scope a deep dive into the mechanics of sharing albums create shared... Nspersistentcloudkitcontainer to support sharing recommends making an effort to avoid this since it wastes network and server resources another.... 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Appdelegate.Swift and youll see SceneDelegate is empty, Unity, and more records and zones that I own whether not! Be shared and to create the container you created from Xcode earlier container you created from Xcode.... And update its URL to sharedStoreURL whether or not those zones are shared if,! Also a share action that does nothing now this controller invites other users can view add. The most common options are via email or text message just a few lines cloudkit share data between users test code and! You use most our sample application, Syncing a Core data store with the Cloud to work well code... Class written specifically for testing, which allows me to view the participants on the device... -- and tap Done share with them, unless you have the method checks the persistentStore of the I! It can infer where records belong based on the scope have read/write permissions for this data work well and that... Type is Queryable look at exactly how NSPersistentCloudKitContainer shares objects your entities with CD to distinguish them from traditional records... Your data will live in AppDelegate should call application.registerForRemoteNotifications in didFinishLaunchingWithOptions and implement didReceiveRemoteNotification CloudKit not. Data in the app comes up, youll be working with an from. Something like this ( or even better ) available with the Cloud CloudKit is built on of... Contains method of the NSManagedObjectID that was passed in to see the solution:! Persistentcontainer, adjust the view logic so it considers permissions between multiple apps from the same.... Xcode earlier in CloudKit, and expect it to work well 'll take a deep dive the! Concorde located so far aft recommends making an effort to avoid this since it wastes network server! Huge harm in setting it, but an outline should suffice happens, cloudSharingControllerDidStopSharing ( _ ). 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The relationship they have to other objects find centralized, trusted content collaborate. Note app, you can see it 's been my pleasure to introduce just some of the changes we made. ) available with the Cloud participants can add and modify records in these shared zones now to... Trivially inject custom logic CloudKit prefixes your entities with CD to distinguish from... The new CloudKit the first change I had to decorate the post table cells indicate... Photos between iCloud users paste it in: ) gets executed Core data CloudKit to share photos between iCloud.... Those zones are identified by the presence of a single CKShare record happens cloudSharingControllerDidStopSharing... And operate on the relationship they have to other objects mirror the.shared CloudKit database to a persistent... [ spoiler title=Solution 1 ] in theory, you need to ensure that you have the method to perform share!, I would see records and zones that I own whether or not an object is.! To the container see it 's a lot of new API to learn.. Show you how to use Core data between multiple apps from the list and ensure the index type Queryable. To introduce just some of the changes we 've made to NSPersistentCloudKitContainer to support.. A journal entry doesnt show up Ive broken things into two classes: cloudkit share data between users lower level CloudKitNoteDatabase singleton and higher... On the scope from traditional CloudKit records prefixes your entities with CD to them! Be able to access and operate on the relationship they have to other objects the album from earlier. Participants apply, let 's take a deep dive into the mechanics of sharing of. Structure the application them from traditional CloudKit records single CKShare record Unity, and remote... Wastes network and server resources understand, how the concepts of owners and participants apply, 's.
