Answers to the specific questions. If you use SwiftUI, you might be able to have just one version of the code with a multiplatform app target. But there is a good chance you will need to build separate iOS and Mac user interface code in some places to provide the best experience on both platforms. SwiftData works on Mac, but it requires macOS 14, which is not out yet. I have not used RevenueCat, but you have to ask yourself if you want people who buy a subscription to get both versions with the subscription. If so, you can have one subscription that works on both platforms. If not, you need separate subscriptions. Renaming, moving, and deleting list items has a lot of differences. If your app does those things, you will need to create separate list code for iOS and Mac. Stick with one Xcode project. Either use the multiplatform app target or create separate targets for iOS and Mac. The following article has more information about multiplatform app targets: https://www.swiftdevjournal.com/xcode-multiplatform-app-targets/

You can't name a Core Data attribute description because it conflicts with a method in the NSObject class. Currently SwiftData uses Core Data under the hood so the limitation also applies in SwiftData. See the following Stack Overflow question for more details: https://stackoverflow.com/questions/4717519/why-cant-i-use-description-as-an-attribute-name-for-a-core-data-entity Name your attribute something other than description.

The sample code is able to pass an optional managed object type Trip? to hold the selection rather than the ID type. When I try to replicate that behavior, I can't. Show the code you tried that didn't work. What is the problem you have with the code you tried? Do you get a build error? If so, what is the error? Do you get unexpected selection behavior? If so, state what you expect to see and what you see with the code you changed.

Xcode does not support devices running a newer version of iOS than the SDK version that comes with the particular version of Xcode. Xcode 14.2 comes with the iOS SDK 16.2. You won't be able to run your project on a device running anything newer than 16.2. If you can't update Xcode, you will have to download the iOS 16.6 support files and copy them to your Xcode bundle. More details are in the following article: https://www.swiftdevjournal.com/dealing-with-failed-to-prepare-device-for-development-error-message-in-xcode/ I also recommend turning off automatic updates on your iOS device. Every time your device updates, Xcode will stop working, and you will have to repeat the cycle of installing support files.

What is the tutorial you are following? I have not used openFrameworks, but your Visual Studio example has a C++ file, the .cpp file, and your Xcode file has an Objective-C file, the .m file. You either need a C++ file or an Objective-C++ file (extension .mm) to get the code to work, as I doubt openFrameworks supports Objective-C. Have you gone through the openFrameworks Xcode setup tutorial? https://openframeworks.cc/setup/xcode/ You will have a better chance of getting an answer at the openFrameworks forums since I doubt very few people here use openFrameworks. I never heard of it until I read your question. https://forum.openframeworks.cc

I get the error "This NSPersistentStoreCoordinator has no persistent stores (unknown). It cannot perform a save operation." What does this error exactly mean? The error message says the persistent store coordinator has no persistent stores. Core Data saves data to a persistent store. If there are no persistent stores, Core Data cannot save your app's data. My container is initialised so it should have a persistent store, right? Are you sure the container was initialized correctly? let container = NSPersistentCloudKitContainer(name: "TaskDataModel") Do you have a CloudKit container named TaskDataModel? Set a breakpoint at the start of the init function in DataController. Does the container property have the value you expect? Step through the code line by line. Does the call to loadPersistentStores run correctly or does it generate an error?

The answers to the following Stack Overflow question may help you solve your problem with Xcode crashing when opening a specific project: https://stackoverflow.com/questions/4455903/xcode-crashing-when-opening-project-file

What is crashing: Xcode or your project? If Xcode is crashing, start by narrowing down the problem. Can you create new projects? Can you open other projects? If you can create new projects and open other projects, you know the problem is with the one project. If your project is crashing when you run it, create an exception breakpoint by choosing Debug > Breakpoints > Create Exception Breakpoint in Xcode. When your app crashes, the exception breakpoint will show you where in your code the app crashes. You will have to post your code for anyone to provide additional help to solve the crashing problem.

I have not used the new @Observable stuff yet, but I am pretty sure that @Environment is used in SwiftUI views, not in view models. What happens if you add the categories view model as a regular property of the NotesViewModel class without any property wrappers? @Observable class NotesViewModel { var notes: [Note] = [] var categoriesViewModel: CategoriesViewModel func foo(){ /// Thread 1: Fatal error: No Observable object of type CategoriesViewModel found. A View.environmentObject(_:) for CategoriesViewModel may be missing as an ancestor of this view. print(categoriesViewModel.categories.count) } }

Place the binary files in the app target's Copy Bundle Resources build phase to add the files to the app bundle. Open the project editor by choosing the project from the left side of the project window. Select the app target from the target list on the left side of the project editor. Click the Build Phases button at the top of the project editor. Click the disclosure triangle next to the Copy Bundle Resources build phases to see the files that are in the build phase. Click the Add button below the file list to add the binary files to the build phase.

To create an app you can copy to other Macs, create an archive of your project and export it. In Xcode choose Product > Archive to create the archive. After creating the archive you can access it from Xcode's Organizer window. Choose Window > Organizer in Xcode to open the Organizer window. Select Archives from the left side of the Organizer to show the archives. You may have to choose your project from a menu above the Archives item on the left side of the window. Select your archive from the list and click the Distribute App button. A sheet opens asking for a method of distribution. Select Copy App because you do not have a paid developer account. Click the Next button. Choose a location to save the archived app and click the Export button. Now you have an app file you can run like any other app on your Mac and copy to other Macs.

You have a code signing error. What are the code signing settings for your project? Select your project from the left side of the project window to open the project editor. Select your app target from the target list on the left side of the project editor. Click the Signing & Capabilities button at the top of the project editor. Does your app have automatic or manual code signing? Are the provisioning profile and signing certificates correct? Xcode also has code signing build settings. Click the Build Settings button at the top of the project editor to access the build settings. The code signing build settings are in the Signing section. Are the values for those build settings what you expect them to be?

Are you making an app for yourself or for other people to use? If you are making an app for other people and want to play an audio file, you should bundle the file with the app and load and play the file from the app bundle. Using the app bundle is better than relying on a file being in the Downloads folder. macOS has privacy preferences in the Security & Privacy section of its Settings/System Preferences app. You can give an app full disk access or give an app access to specific folders. If you are making an app for yourself, use these settings to give your app permission to access what you need on the file system. You can give a sandboxed app access to the Downloads folder from the File Access section of the App Sandbox settings in Xcode.

Reddit has a Swift Playgrounds group that you could ask questions about the app. https://www.reddit.com/r/SwiftPlaygroundsApps/ Hacking with Swift has a forum where beginners can ask questions on Swift. https://www.hackingwithswift.com/forums

I tried solution mentioned in support page. But it is not working out. What specifically is the solution you tried that did not work? Xcode's issue navigator will show the build errors in your project. Press Cmd-4 in Xcode to open the issue navigator. What are the build errors the issue navigator shows? If the only build error the issue navigator shows is Error: Failed with exit code exited with status 1, clean the build folder by choosing Product > Clean Build Folder in Xcode. After cleaning the build folder, build the project again. Are you using CocoaPods in your project? Using them can cause build errors where you would need to update the pods.