NSPersistentCloudKitContainer also has to understand, how the concepts of owners and participants apply, Let's imagine I have a collection of people. How can I change a sentence based upon input to a command? to store the objects an application creates. rev2023.3.1.43269. It is also possible to serialize CKRecords directly to and from local storage. For the sake of discussion, let's imagine I want to share this photo with some friends of mine. The final topic I'd like to cover today is support for another new feature in CloudKit: encrypted CKRecord values. It has a wide variety of actions I can take, including a number of ways to share. For this example, youll use CKAsset to store the note text. Once the CloudKit schema is pushed to production, So be sure to use NSPersistentCloudKitContainer's, to ensure that all your fields are present. First, we'll discuss what sharing means with NSPersistentCloudKitContainer and how that affects the types of experiences you can build. 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. To demonstrate how sharing works with NSPersistentCloudKitContainer, I'm going to be using our sample application, Syncing a Core Data Store with the Cloud. This snippet of code is part of a test case I wrote, to ensure that its table cells correctly indicate. They build on Apples notification infrastructure to allow various clients to get push notifications when certain CloudKit changes occur. This might not always be the best outcome for professional apps, but its not bad for a first rule and, for this purpose, serves to illustrate the mechanism by which CloudKit passes conflict information back to the client. To change the permissions and access to this data, Apple has done all the heavy lifting for you. just as they can in the zones that I own. When the dialog asks whether you would like to open the invitation, choose Open. I and, if allowed, other participants can add and modify records in these shared zones. 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"--. CloudKit supports both the concept of public and private databases. These days, modern mobile application development requires a well thought-out plan for keeping user data in sync across various devices. Finally, I'll tap Send to send the email. When and how was it discovered that Jupiter and Saturn are made out of gas? 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). Synchronizing a Local Store to the Cloud. Here, youll add the code to accept the share. I had to build new user interface elements, to display information about the participants, All of this work required accessing some metadata. Why was the nose gear of Concorde located so far aft? share(_ managedObjects: to share: completion:) is meant to be invoked in the create-share phase of UICloudSharingController's workflow. 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. Over time, however, Apple has addressed these issues. Next, I configure an instance of the BlockBasedShareProvider. But ideally, we would have a single place. CloudKit sharing involves the creation of CKShare objects initialized with the record to be shared. to display more information in my user interface. So I'll change the share options to mark the share as View Only. Apple has been adding data sharing into many of its first-party apps, including: Files Reminders Notes Calendar Photos Activities Find My Maps Music Health Here you created a CKContainer property using your persistent container store description. before they are uploaded to the CloudKit server. Figure 48 3, for example, shows a share link loaded into the Mail app ready to be sent: When a user receives a share link and selects it, a dialog will appear providing the option to accept the share and open it in the corresponding app. The first step is to implement the UIKit scene delegate method windowScene(_:userDidAcceptCloudKitShareWith:). What is the easiest way to share files between users with CloudKit? 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. 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.. Careful error handling is absolutely essential for a CloudKit client. to write all of these tests and structure the application. For our purposes, a single view application containing a UITextView with the ViewController as its delegate will suffice. 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. Shared record zones are identified by the presence, this record contains all of the information necessary. Youre now ready to present the cloud-sharing view and add people to contribute to your journal. This means not only the owner but also the second user can modify the data shared with them. The answer is, "Not much." CloudKit provides much more functionality on top of this, especially for sophisticated data models, public sharing, advanced user notification features, and more. How did StorageTek STC 4305 use backing HDDs? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. NSPersistentCloudKitContainer turns those managed objects into instances of CKRecord that are stored in CloudKit. Log in to your iCloud account on a real device. Xcode prefixes the container name with iCloud. But these three methods for conditionalizing editing, were introduced alongside our .public database support, You can use these methods in your applications. my application can access data in both stores. Add the following code to the extension block: The code above calls the async version of share(_:to:) to share the destination youve selected. I might need to know whether or not an object is shared. 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. 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. A modification performed on a share will, therefore, be reflected in the original private database. to present information about shared objects. The SharingProvider protocol makes it easy to test these decision points by injection. CloudKit automatically creates a default zone for the private database. Each of these is mirrored to a persistent store. 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. To understand these challenges a bit more clearly. Youll use the default share when you present the CloudSharingView. 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. Learn to share data between CoreData and CloudKit in a SwiftUI app. Loading a note is very straightforward. The largest and most up-to-date collection of courses and books on iOS, I'm Nick Gillett, an engineer here at Apple on the Core Data team. He loves solving hard problems. bookmark, personalise your learner profile and more! 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. Share Core Data between users with NSPersistentCloudKitContainer Ask Question Asked 3 years, 7 months ago Modified 1 year, 8 months ago Viewed 3k times 16 Apple introduced the NSPersistentCloudKitContainer with iOS 13 which enable us to use CloudKit with Core Data. Sharing with one other person is interesting, Each of these participants will be able to access. Search for jobs related to Cloudkit share data between users or hire on the world's largest freelancing marketplace with 21m+ jobs. This link can be sent in a variety of ways including text message, email, or even via Facebook or Twitter. These values are stored in a new payload on CKRecord called encryptedValues, introduced in the "What's New in CloudKit" session. that allows me to call up an Action sheet. The most common options are via email or text message. We and our partners use cookies to Store and/or access information on a device. Here I'm setting the isSharedBlock to call the contains method of the set I created. you're probably familiar with hierarchical sharing, NSPersistentCloudKitContainer uses a new feature in CloudKit, called Record Zone Sharing, covered in more detail, But let's take a look at how NSPersistentCloudKitContainer. This class is initialized with the root CKRecord instance that is to be shared with other users together with the permission setting. Tapping this button removes a destination from your travel journal. In my .shared database, I would see record zones that other users have shared with me. Differentiating private data and shared data in SwiftUI. based on the relationship they have to other objects. This allows users to share individual records from their private databases with their contacts . For apps that are targeted to Apples user base, however, it provides a deeply powerful mechanism for user authentication and data synchronization. all of the shared objects into the local store. than the simple injection I used in the test. The following code, for example, creates a CKShare object containing the record to be shared and configured for read-only access: Once the share has been created, it is saved to the private database using a CKModifyRecordsOperation object. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? NSPersistentCloudKitContainer manages these zones and automatically assigns records to them. Heres Apples sample project on Synchronizing a Local Store to the Cloud. fetchShares(matching objectIDs:) is new in iOS 15 and allows me to get the CKShare for a specific post. In addition, they would see my two zones that I share with them and any other zones they are a participant on in their .shared database. Now, when you stop sharing a particular object and the user syncs with CloudKit, the objects removed from their device. Photos implements a system control here in the lower left that allows me to call up an Action sheet. So let's take a look at exactly how NSPersistentCloudKitContainer shares objects. When a user decides to share CloudKit data, a share link in the form of a URL is sent to the person with whom the data is to be shared. I've already modified it to support sharing posts with different iCloud users. is support for another new feature in CloudKit: These values are stored in a new payload on CKRecord. 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. This involves the creation of a CKFetchRecordsOperation object using the record ID contained within the CKShareMetadata object. In Record Zone Sharing, shared CKRecords are contained inside a shared CKRecordZone. directly to NSPersistentCloudKitContainer. In a CloudKit database-- for example, the .private database-- NSPersistentCloudKitContainer typically manages a private zone to store the objects an application creates. Tap the entry you want to update the permissions for. 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. Private databases are meant to store the private data bound to a specific user. 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. You could use the recordId for this. Look for the ToolBarItem that contains the Text("Edit") button. Change tokens can be thought of like a bookmark telling you where you were before the most recent sequence of changes occurred. directly to specific call sites in my application. Kodeco requires JavaScript. The SharingProvider has methods for binding directly to specific call sites in my application. Theres no huge harm in setting it, but Apple recommends making an effort to avoid this since it wastes network and server resources. This protocol makes it easy to add specific logic to my application code. Lets look now at a layer built on top of that to manage these operations in the context of a specific Note. This is new iOS 15 and allows NSPersistentCloudKitContainer to be configured to mirror persistent stores to the .shared CloudKit database. 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. Let's get started with sharing. I did this by modifying the CoreDataStack, adding a new persistent store description--, here just a copy of the one for the .private store, Then, I set its CloudKit container options, to be configured to mirror persistent stores, I adopted a new method on NSPersistentCloudKitContainer, share(_ managedObjects: to share: completion:). Also, CloudKit provides a specific record type for large binary objects. It checks databaseScope and determines whether its private or shared. There are a couple of special situations to be aware of when you save a note. Finally, I'll tap Send to send the email. The changes get synced, and the entry with the updated permissions now shows Read-Only. I've configured it to be an optional Transformable attribute and checked this new Allows Cloud Encryption checkbox. Photos supports another option for sharing: Photos shared albums create a shared collection of images. Open CoreDataStack.swift. Discover how to create informative experiences around shared data and learn about the CloudKit technologies that support these features in Core Data. The first iteration of Core Data in iCloud on iOS worked on top of document storage and employed the same iCloud APIs. for you to build tests in your own applications. Well, let me show you. provided by NSPersistentCloudKitContainer. Have a question? Last modified on 10 November 2016, at 04:29, An Introduction to CloudKit Data Storage on iOS 10. Owners create and share objects with a set of participants. So I'll change the share options to mark the share as View Only. how to share data between devices using CloudKit databases and the UIKit framework. 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