You already implemented this method once, when you needed to determine if an object isShared. 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. Download the starter project by clicking the Download Materials button at the top or bottom of this tutorial. and the cells that correspond to unshared objects don't. He loves solving hard problems. before they are uploaded to the CloudKit server. With this code in place, build and run on your second device. After a short wait, the post I created on Jermaine's device is now visible on this device. directly to specific call sites in my application. Sign in to your Apple ID. here, the shared store for my application. bookmark, personalise your learner profile and more! 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. I simply give the new album a title and then tap Next to choose the set of participants. Then, open the starter project. before deploying your schema to production. 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. 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. So I'll change the share options to mark the share as View Only. Build and run. Let's see that in action. CloudKit provides you ready to use data sharing API that allows you to implement collaborative features of your app without much effort. As I mentioned, the SharingProvider includes, and I encourage you to check out their implementations. Because there's no root record, NSPersistentCloudKitContainer also has to understand how the concepts of owners and participants apply to the entire record zone. Heather, Jermaine, Percy, and Mary are all test accounts I regularly work with when I'm building sharing features. Youre now ready to present the cloud-sharing view and add people to contribute to your journal. When you create a destination, the data is being persisted via Core Data locally in your app. How might we build an experience like this? 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. 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. 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 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). After adding a few of these customizations. So that's how we use NSPersistentCloudKitContainer. Theres one minor bug with your app at the moment. and how that affects the types of experiences you can build. The app designer is always in the best position to define rules for these situations, which can include everything from context-aware automatic merging to user-directed resolution instructions. to test these decision points by injection. Select recordName from the list and ensure the index type is Queryable. 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. they would see my two zones that I share with them, and any other zones they are a participant on, So how does NSPersistentCloudKitContainer. Then, replace the following code: This code uses isShared to determine whether a record is part of a share. fetchShares(matching objectIDs:) is new in iOS 15. and allows me to get the CKShare for a specific post. Should I include the MIT licence of a library which I use from a CDN? I might need to know whether or not an object is shared. 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. 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. 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. Last, head to the CloudKit Console so you can verify your data. Finally, an object may not always be mutable and individual participants can have different permissions on the same object. that allows me to call up an Action sheet. rev2023.3.1.43269. The SharingProvider protocol makes it easy to test these decision points by injection. So I'll tap Mail and then enter the information for my friends. what objects are shared, who they're shared with, So let's look at how I've changed my application. 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 . 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. Once you accept the share on the second device, its now part of your shared zone in iCloud. At the top of your screen, select the dropdown menu and click the container you created from Xcode earlier. that other users can view and, if desired, contribute to. A general guideline is to use com.company_name.bundle_identifier. An error occurred when submitting your query. NSPersistentCloudKitContainer manages these zones and automatically assigns records to them. 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. into instances of CKRecord that are stored in CloudKit. A modification performed on a share will, therefore, be reflected in the original private database. and a shared zone that they own in their .private database. 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. Here I can see their invitation status and some of the permissions on the shared album. Hiring? See the solution below: [spoiler title=Solution 2] The class contains all the necessary methods and properties you need to interact with Core Data. When a notification comes in that a record has changed, CloudKitNoteDatabase will do the heavy lifting of fetching the changes from CloudKit. From this screen, you can take a few actions. Learn how to easily build apps that share data between multiple iCloud users with NSPersistentCloudKitContainer. There's a lot of new API to learn about. Using a single managed object context, my application can access data in both stores. Change the permission to View only. I've already saved Heather and Mary in my address book, so they're easy to find. In my example, I do this by using CKFetchRecordZoneChangesOperation and CKServerChangeTokens. Now that you have the method to perform the share, you need to present the CloudSharingView when you tap the Share button. The version held by the server at the time you submitted the request. Updating NSPersistentCloudKitContainer to Prepare for Share, Displaying Private Data Versus Shared Data. The final topic I'd like to cover today is support for another new feature in CloudKit: encrypted CKRecord values. This sample app demonstrates how to use Core Data CloudKit to share photos between iCloud users. Im going to take a fairly deep technical dive into the CloudKit API to explore ways you can leverage this technology to make awesome multi-device apps. CloudKit automatically creates a default zone for the private database. Under the Schema section, select Indexes. 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. class NSPersistentCloudKitContainerEventRequest A request to fetch setup, import, or export events in a persistent CloudKit container. 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. You can think of the name as the primary key of the record in a simple database sense (names must be unique, for example). If I tap on it, I can also see the participants displayed at the bottom of the detail view controller with their role, permissions, and acceptance state. enum NSPersistentCloudKitContainer.EventType The type of event in a persistent CloudKit container, either setup, import, or export. How did StorageTek STC 4305 use backing HDDs? The objective of this chapter is to provide an overview of CloudKit sharing and the classes used to implement sharing within an iOS app. I've had to make a number of changes to the user interface. However, to allow other users to interact with this data, you need to update your NSPersistentCloudKitContainer. I and, if allowed, other participants can add. If I tap on it, I can also see the participants, displayed at the bottom of the detail view controller. For more information, check Apples video on Build apps that share data through CloudKit and Core Data. 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. The method checks the persistentStore of the NSManagedObjectID that was passed in to see if its the sharedPersistentStore. to instantiate an instance of UICloudSharingController. The owner is the iCloud account that actually owns an object. 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. Then just create a deplink that includes that unique identifier. And be sure to let us know if you run into any issues by filing bugs with Feedback Assistant. 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. 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. Youll use the default share when you present the CloudSharingView. This is a thorny problem with many gotchas and pitfalls, but users expect the feature, and expect it to work well. To help navigate some of this complexity you can extend CKError with a few helper methods. Was Galileo expecting to see so many stars? Also, to change the sharing permissions because it doesnt work properly on a simulator. Now I'm going to add a new post, give it a title, and tap Done. A participant is any other iCloud account. In fact, in a sense, youre recreating the convenience APIs. To get the most out of this session, check out our previous videos on NSPersistentCloudKitContainer: "Using Core Data With CloudKit" from WWDC19 and "Sync a Core Data store with the CloudKit public database" from WWDC20. The next step is to create the container your data will live in. For example, this user may have a private zone and a shared zone that they own in their .private database. Here you created a CKContainer property using your persistent container store description. Sharing with one other person is interesting, Each of these participants will be able to access. The first step does a one-time setup in preparation for writing the record, and the second step passes the assembled record down to the singleton CloudKitNoteDatabase class. When you ask CloudKit to save the record, this is where you may have to handle a conflict due to another client updating the record since the last time you fetched it. 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