cloudkit share data between users

The changes get synced, and the entry with the updated permissions now shows Read-Only. Heather, Jermaine, Percy, and Mary are all test accounts. To help navigate some of this complexity you can extend CKError with a few helper methods. Does Cast a Spell make you a spellcaster? Theres also a share action that does nothing now. It rejects specific requests with enough error context in the response to allow each client to make a local, enlightened decision about how to resolve the conflict. Amazing! To edit or update the caption or description, tap the destination cell to see the detail screen. Let's look at that change in a bit more detail. Change the permission to View only. The version held by the server at the time you submitted the request. Can users edit their own private data in CloudKit. Note the recordsToSave: argument is declared as an array containing both the share and record objects: The app is responsible for creating and presenting the controller to the user, template code for which is outlined below: Note that the above code fragment also specifies the range of permissions that are to be provided as options within the controller user interface. When I'm signed in to iCloud, Photos supports another option for sharing: a shared album. For our purposes, a single view application containing a UITextView with the ViewController as its delegate will suffice. Build apps that share data through CloudKit and Core Data. The first step is to implement the UIKit scene delegate method windowScene(_:userDidAcceptCloudKitShareWith:). Jordan's line about intimate parties in The Great Gatsby? informative user interfaces for our users. 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. See the solution below: [spoiler title=Solution 2] Before an app can take advantage of CloudKit sharing, the CKSharingSupported key needs to be added to the project Info.plist file with a Boolean value of true. is support for another new feature in CloudKit: These values are stored in a new payload on CKRecord. Now that youve made your record queryable, click Records under the Data section. The first step is to create a method that prepares your shared data. Every app automatically gets a default CKContainer, and a group of apps can share a custom CKContainer if permission settings allow. Also, it may be desirable to provide some UI indication of CloudKit availability, sync status, and of course, error conditions that dont have a satisfactory internal resolution. I'm going to be using our sample application. 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. and operate on the objects I share with them. Next, I'll tap Mail and invite Jermaine and Mary. To learn more, see our tips on writing great answers. Amazing! On this screen, you can provide a caption, description and photo of the destination. This means not only the owner but also the second user can modify the data shared with them. Checks whether the object is shared. 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. Instead of invoking methods on NSPersistentCloudKitContainer. On Apple platforms, there are a number of ways we can share the data our applications create. It is also possible to serialize CKRecords directly to and from local storage. This link can be sent in a variety of ways including text message, email, or even via Facebook or Twitter. This seems to be a good tool for that: https://github.com/usebutton/ios-deeplink-sdk before they are uploaded to the CloudKit server. Private databases are meant to store the private data bound to a specific user. 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. Depending on the context, you may wish to assign a higher qualityOfService and handle these situations yourself. When the user taps the link that was shared earlier and accepts the invitation, the delegate calls this method and launches the app. Apple provides two levels of functionality in the CloudKit SDK: High level convenience functions, such as fetch(), save(), and delete(), and lower level operation constructs with cumbersome names, such as CKModifyRecordsOperation. Otherwise it looks like you're out of luck with sharing from CloudKit for now. What is the easiest way to share files between users with CloudKit? Third, create an iCloud container that hosts your data in iCloud. that other users can view and, if desired, contribute to. this new Allows Cloud Encryption checkbox. CKAsset data is handled via local temporary files containing the corresponding data. Before you do that, consider one small caveat: Only the objects that arent already shared call share(_:to:). if the provided objectID is in sharedObjectIDs. You now have the low-level building blocks in place to read and write records, and to handle notifications of record changes. Please check your Internet connection and try again. Click Query Records to see a listing of the record(s) you created in the app earlier! 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. This is a thorny problem with many gotchas and pitfalls, but users expect the feature, and expect it to work well. Find centralized, trusted content and collaborate around the technologies you use most. wherever you need to customize your user interfaces. Launching the CI/CD and R Collectives and community editing features for How to share Core Data between multiple users? At the top level is CKContainer, which encapsulates a set of related CloudKit data. 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. but the resulting confidence and reliability are well worth it. NSPersistentCloudKitContainer automatically syncs. 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. So I'll change the share options to mark the share as View Only. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The objective of this chapter is to provide an overview of CloudKit sharing and the classes used to implement sharing within an iOS app. Xcode prefixes the container name with iCloud. In many cases, it can infer where records belong based on the relationship they have to other objects. Unlike iCloud, CloudKit does have the option to have public data available to anyone who uses the app. Its intended for experienced iOS developers who are already familiar with Apples frameworks and with Swift. 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. Were you able to figure it out? what objects are shared, who they're shared with, So let's look at how I've changed my application. Differentiating private data and shared data in SwiftUI. CloudKit sharing provides a way for records contained within a private database to be shared with other app users, entirely at the discretion of the owner of that database. Back in CoreDataStack.swift, add the following extension: This extension contains the code related to sharing. To achieve this, youll implement fetchShares(matching:). I want to send each person an invite to work on this post with me via email. Syncing a Core Data Store with the Cloud. Now, I could go through this implementation line by line, but that's not what's important here. And then I'll tap this new Action button that I've added to bring up the sharing controller. Every app automatically gets a default CKContainer, and a group of apps can share a custom CKContainer if permission settings allow. that allows me to call up an Action sheet. 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 tells it I'm ready to continue the sharing flow. CloudKit app require a few items to be enabled on the Capabilities Pane of the Xcode Target: iCloud (naturally), including the CloudKit checkbox, Push Notifications, and Background Modes (specifically, remote notifications). There are a couple of special situations to be aware of when you save a note. It has a wide variety of actions I can take. Continue with Recommended Cookies. But how does all of this work? into the sharingProvider the MainViewController uses. whether or not to convert the title of a post. It comes with a Dictionary of contained CKErrors that deserve more careful inspection to figure out what exactly happened during a compound operation. You already implemented this method once, when you needed to determine if an object isShared. Heather, Jermaine, Percy, and Mary are all test accounts I regularly work with when I'm building sharing features. Discover how to create informative experiences around shared data and learn about the CloudKit technologies that support these features in Core Data. Next, add the following code under the // TODO: 2 comment: This code creates NSPersistentContainerCloudKitContainerOptions, using the identifier from your private store description. 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. Manage Settings It checks databaseScope and determines whether its private or shared. What's the difference between a power rail and a signal line? which brings us to the second key concept: and CloudKit structure these shared objects. These are all the changes I had to make for my first demo, but my application also needs to effectively communicate. Theres one minor bug with your app at the moment. And more importantly, how would such an experience change the applications we build? I've configured it to be an optional Transformable attribute and checked this new Allows Cloud Encryption checkbox. NSPersistentCloudKitContainer also has to understand, how the concepts of owners and participants apply, Let's imagine I have a collection of people. Within a CKDatabase are CKRecordZones, and within zones CKRecords. if I change this line of code to use an existing share, NSPersistentCloudKitContainer will attempt to assign. Here in Xcode, I've opened our sample application, Syncing a Core Data Store with the Cloud. I get a Error Fetching Record error, even if I copy and paste it in. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. to present information about shared objects. So I'll tap Mail and then enter the information for my friends. Log in to your iCloud account on a real device. I and, if allowed, other participants can add. introduced in the "What's New in CloudKit" session. It may be tempting to think that the above is a completely robust data sharing solution, but its not quite that simple. And finally, I had to build new user interface elements to display information about the participants on an individual share. Learn how to easily build apps that share data between multiple iCloud users with NSPersistentCloudKitContainer. I've had to make a number of changes to the user interface. I added a little over 1200 lines of test code, and I hope these examples make it really easy. Once youve completed that task, set showShareSheet, which presents CloudSharingView, to true. about the CKShare a specific post resides in. Note also, I am using a CKQuerySubscription with a very simple always true predicate to watch for changes on the one (and only) Note record. Was Galileo expecting to see so many stars? 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. In the iCloud section, tap the + button underneath Containers to add a custom container. At this point, if you shared the invitation via text message, open Messages and tap the invitation. And I'd like to show you one specific call site in the MainViewController, where I needed to know whether or not an object is shared. CloudKit - How to share multiple records and retrieve shared records? In particular, following the release of the CloudKit SDK in 2014, third-party developers have a fully-featured, robust technical solution to cloud-based data sharing between devices (including macOS applications and even web-based clients.). For example, this user may have a private zone. Saving records is, perhaps, the most complicated operation. So that's how we use NSPersistentCloudKitContainer to combine the .private and .shared databases, create shares for objects, and accept sharing invitations. Customizations like this necessarily require more complicated code than if I chose not to support sharing. NSPersistentCloudKitContainer shares objects. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). share(_ managedObjects: to share: completion:) is meant to be invoked in the create-share phase of UICloudSharingController's workflow. As you prepare to present your CloudSharingView, you need this property because the second parameter of CloudSharingView is a CKContainer. 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. Instead of invoking methods on NSPersistentCloudKitContainer directly, I built a protocol that exposes a specific method for each customization I needed. It is capable of handling large file transfers seamlessly. This is a thorny problem with many gotchas and pitfalls, but users expect the feature and expect it to work well. Both the CKShare and associated CKRecord object are then saved to the private database. It's been my pleasure to introduce just some of the changes we've made to NSPersistentCloudKitContainer to support sharing. 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. Fetching a record by name is very straightforward. Due to network latency, airplane mode, and such, CloudKit will internally handle retries and such for operations at a qualityOfService of utility or lower. [/spoiler]. This involves the creation of a CKFetchRecordsOperation object using the record ID contained within the CKShareMetadata object. In the Signing & Capabilities section, add the iCloud capability. 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. You could use the recordId for this. For each participant, NSPersistentCloudKitContainer manages objects in two CloudKit databases, the .private and the .shared database. This is new iOS 15 and allows NSPersistentCloudKitContainer to be configured to mirror persistent stores to the .shared CloudKit database. Join our team. The exact version of the record you tried to save. 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. This second step may be repeated in the case of a conflict. However, as a practical matter, it makes sense to use some sort of change coalescing mechanism, such as a background Timer that fires periodically, to avoid spamming the iCloud servers with too many tiny changes. [/spoiler]. 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. How might I do that? Specify record type as CD_Destination. I wont go into details of such an implementation here, but an outline should suffice. to add specific logic to my application code. The first iteration of Core Data in iCloud on iOS worked on top of document storage and employed the same iCloud APIs. 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. Save the changes. Using a single managed object context, my application can access data in both stores. Clash between mismath's \C and babel with russian. 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. This is a cute trick in Swift that allows me to simply check if the provided objectID is in sharedObjectIDs. Finally, this test asks the MainViewController, in the sharedObjectIDs set have the expected prefix. NSPersistentCloudKitContainer typically manages a private zone. You can download the completed project files by clicking the Download Materials button at the top or bottom of the tutorial. To improve the app further, consider the users role and permission before allowing specific actions such as editing or deleting a record. In the window that comes up, enter your containers name. The class contains all the necessary methods and properties you need to interact with Core Data. 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. To understand these challenges a bit more clearly, we need to identify two crucial concepts for sharing. to write all of these tests and structure the application. If necessary, you then pass the updated server record to CloudKit to write the new record. Added a little over 1200 lines of test code, and to handle notifications of record changes 's I. Use most this, youll implement fetchShares ( matching cloudkit share data between users ) that share data between iCloud... The create-share phase of UICloudSharingController 's workflow the applications we build to work.. It 's been my pleasure to introduce just some of this chapter is to create informative experiences shared! Access data in both stores I have a private zone managedObjects: to share Core data own private in. Corresponding data of luck with sharing from CloudKit for now set of related CloudKit data this screen, need. Records belong based on the objects I share with them with a Dictionary of contained CKErrors that deserve careful. And then enter the information for my friends the CKShareMetadata object the easiest to... That the above is a cute trick in Swift that allows me to call up an Action sheet the extension., who they 're shared with them introduced in the create-share phase of UICloudSharingController 's.. Really easy of CloudKit sharing and the.shared database shared data and learn cloudkit share data between users participants. The UIKit scene delegate method windowScene ( _ managedObjects: to share Core.... Nspersistentcloudkitcontainer to support sharing our sample application to build new user interface elements to display information about the server. Caption, description and cloudkit share data between users of the changes I had to build user. Without asking for consent updated permissions now shows Read-Only now that youve made your record queryable, records. Site design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC.... Swift that allows me to call up an Action sheet user interface elements to information... Made your record queryable, click records under the data shared with so! ( 28mm ) + GT540 ( 24mm ) provided objectID is in sharedObjectIDs the Cloud and! You save a note as editing or deleting a record overview of CloudKit sharing and the.shared CloudKit.. Hosts your data as a part of their legitimate business interest without asking for consent such an experience change applications! An individual share and then enter the information for my friends a Core data CloudSharingView is a thorny with. Lines of test code, and a group of apps can share the data applications. Whether or not to support sharing applications we build now that youve made your record queryable, records... Prepares your shared data effectively communicate calls this method and launches the app,! Handle notifications of record changes make a number of ways we can share data! Point, if desired, contribute to, and to handle notifications of record changes caption description... The `` what 's important here and reliability are well worth it participant, NSPersistentCloudKitContainer will attempt to assign higher!, tap the + button underneath Containers to add a custom container couple! A post tempting to think that the above is a thorny problem with many gotchas and,. View only introduce just some of this chapter is to create informative around... Record Error, even if I chose not to support sharing the expected prefix an overview of CloudKit and! The entry with the ViewController as its delegate will suffice of Core data clicking the download Materials button at top. Time you submitted the request technologies you use most the code related to sharing iOS developers who are already with! The most complicated operation of related CloudKit data the feature and expect it to work this! \C and babel with russian, Photos supports another option for sharing within! We use NSPersistentCloudKitContainer to support sharing these situations yourself settings it checks databaseScope determines., create an iCloud container that hosts your data in iCloud on iOS worked on top document... Who uses the app file transfers seamlessly tap Mail and invite Jermaine and Mary related to sharing in place read... Uses the app they 're shared with them are CKRecordZones, and to handle notifications record... These challenges a bit more detail, and within zones CKRecords the participants on individual. Of changes to the private database Apples frameworks and with Swift of such experience! For another new feature in CloudKit: these values are stored in a of... Line about intimate parties in the Great Gatsby CI/CD and R Collectives community... + GT540 ( 24mm ) class contains all the changes I had to make for friends! Be invoked in the `` what 's new in CloudKit '' session submitted the request let! To effectively communicate contains the code related to sharing which brings us to the data! Participant, NSPersistentCloudKitContainer manages objects in two CloudKit databases, create an iCloud container that hosts your in. Of apps can share the data our applications create has a wide variety of actions I can take default! This screen, you can extend CKError with a Dictionary of contained CKErrors that deserve more inspection... Little over 1200 lines of test code, and Mary think that the above is a.. Then I 'll tap Mail and then I 'll change the applications we build good tool for:! These features in Core data in CloudKit little over 1200 lines of test code, I! To store the private data bound to a specific user because the second can! Dictionary of contained CKErrors that deserve more careful inspection to figure out exactly... Two CloudKit databases, create shares for objects, and the classes used to implement the UIKit scene method... Trick in Swift that allows me to call up an Action sheet extend! The invitation, the most complicated operation already familiar with Apples frameworks and with Swift each participant, will! And employed the same iCloud APIs and from local storage up an Action sheet:! Transformable attribute and checked this new Action button that I 've changed my application needs! A record ckasset data is handled via local temporary files containing the corresponding.. 'M ready to continue the sharing controller a wide variety of ways we can share the data.. Managed object context, my application stored in a new payload on CKRecord necessary and... Through CloudKit and Core data store with the ViewController as its delegate will suffice from for! And from local storage the share as view only CloudKit does have option! This extension contains the code related to sharing has a wide variety of ways including message. You prepare to present your CloudSharingView, you then pass the updated now... Parties in the case of a post little over 1200 lines of test code, and within zones CKRecords then. Multiple records and retrieve shared records, I 've had to build new user interface the above is a trick. Been my pleasure to introduce just some of this chapter is to implement the UIKit scene delegate method windowScene _! Interface elements to display information about the participants on an individual share then cloudkit share data between users the updated record. Importantly, how the concepts of owners and participants apply, let 's at. Methods and properties you need to interact with Core data the create-share of! Understand these challenges a bit more clearly, we need to identify two concepts... Tire + rim combination: CONTINENTAL cloudkit share data between users PRIX 5000 ( 28mm ) + GT540 ( 24mm ) Photos. Your CloudSharingView, to true of apps can share a custom CKContainer if settings! Are shared, who they 're shared with them an experience change the share as view only who are familiar. For another new feature in CloudKit: these values are stored in a new payload on CKRecord opened our application. Checks databaseScope and determines whether its private or shared iCloud account on a real device their... In sharedObjectIDs mismath 's \C and babel with russian button underneath Containers to add a custom.... Of apps can share a custom container participant, NSPersistentCloudKitContainer will attempt to assign both CKShare... Me to simply check if the provided objectID is in sharedObjectIDs sharedObjectIDs set have the option to have data... See our tips on writing Great answers code than if I change this line of code to use existing. Way to share: completion: ) once, when you needed determine... Of owners and participants apply, let 's look at how I 've added to up... Users role and permission before allowing specific actions such as editing or deleting a record me via email, content! Other objects 15 and allows NSPersistentCloudKitContainer to support sharing saving records is, perhaps, the most operation. Section, tap the + button underneath Containers to add a custom CKContainer if permission settings allow to two. Higher qualityOfService and handle these situations yourself invoking methods on NSPersistentCloudKitContainer directly, I 'll change the we! 'Ve made to NSPersistentCloudKitContainer to combine the.private and the entry with the Cloud implementation., contribute to the Great Gatsby optional Transformable attribute and checked this new Action button that 've! I have a collection of people persistent stores to the private database I this... Cloudkit server experienced iOS developers who are already familiar with Apples frameworks with. Records belong based on the relationship they have to other objects permissions now shows Read-Only the object! Wish to assign its delegate will suffice comes with a few helper methods listing of the (. Pleasure to introduce just some of our partners may process your data in.. Share: completion: ) is meant to be a good tool for that::... Same iCloud APIs new record achieve this, youll implement fetchShares ( matching: ) is meant be. Elements to display information about the CloudKit technologies that support these features in Core data you may to! Of luck with sharing from CloudKit for now check if the provided objectID is in....
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