Please list the steps in detail on what you did to create the code and compile it. The information you provided isn't enough for people to answer your question. Providing more details on what you did to create the code and compile it will give people here a chance to give you a helpful answer. You tagged your question as Xcode, but your screenshot looks like Visual Studio Code. Did you create a project in Xcode or create a C++ file in Visual Studio Code? Does you MacBook have an Intel processor or an Apple Silicon (M1 or M2 chip)? The linker error says it can't find a main function for the Intel architecture.

The usual cause of the "Closure containing a declaration cannot be used with result builder ViewBuilde" error is doing something besides showing views inside the body of a SwiftUI view. If you do something like declare a function or make a network call inside the body of a SwiftUI view, you will get this error. If you want a fix for the error, show the code for the SwiftUI view where you get this error. Without that code, no one can tell you the mistake you made that caused the error or tell you what you need to do to fix the error.

Show the code where you add the entity. If you want to see whether the issue is with the split view, create a list that just shows the items and add a way to add new items. If you still have problems, you know the split view isn't causing the problems. Also see the following Stack Overflow question: https://stackoverflow.com/questions/73028881/swiftui-list-crashes-when-adding-items-on-macos

Apple's C++ templates are at the following path: /Applications/Xcode.app/Contents/Developer/Library/Xcode/Templates/File Templates/MultiPlatform/Source You should create a custom file template instead of editing the templates in the Xcode app bundle. Copy the C++ file template from Xcode to the path for custom templates. ~/Library/Developer/Xcode/Templates/File Templates You'll probably want to create another folder to hold your custom templates. The following article shows you how to create a custom file template for Xcode: http://www.popcornomnom.com/create-custom-xcode-file-template-for-ios-and-macos-swift-5/ If that article is too complicated, do a search for creating custom Xcode file templates in a search engine. That will give you multiple articles on creating file templates.

Is there a reason you are using a xib file and an IBOutlet to show a single label? It would be easier to create the label in code inside the makeUIView function. If you have a more complex view that requires a xib file or storyboard, use UIViewControllerRepresentable to create a view controller instead of using UIViewRepresentable for a single UI view.

Xcode's compiler should provide a fix for you if you click the button for the error in the source code editor and click the Fix button. The fix is to create a Double value from the precisionNumber constant to use for multiplying and dividing. value *= Double(precisionNumber) value /= Double(precisionNumber)

You don't need to install the macOS 12 SDK to use the package. The package will work with the macOS 13 SDK that ships with Xcode 14. The macOS(.v12) listing you showed means the package requires macOS 12 or higher. The package won't run on macOS 11, but it will run on macOS 13.

Years ago I had a similar issue when I saved documents on a device where I hadn't ever saved a document on that device. The workaround was to create and save a document in one of Apple's iWork apps: Pages or Numbers. After doing that the documents I saved in the app I was developing appeared in the document list.

You can't downgrade your phone. You can install support files for iOS 16.4 to be able to debug your project on Xcode 12. Read the following article for more detailed information: https://www.swiftdevjournal.com/dealing-with-failed-to-prepare-device-for-development-error-message-in-xcode/

Create a Swift Playgrounds App project in Xcode if you want to use the project in the Swift Playgrounds app on iPad. You can find more detailed information in the following article: https://www.swiftdevjournal.com/working-on-a-swiftui-project-in-xcode-and-swift-playgrounds/

Before you trash Xcode 14.3, copy the iOS 16.4 support files to your Xcode 14.2 install. That will let you debug on your iOS 16.4 device with Xcode 14.2. You may find the following thread helpful: https://forums.macrumors.com/threads/xcode-14-2-14c18-breaks-with-ios-16-4-iphone-14-13-12-pro-iphonex-failed-to-prepare-device-for-development-after-os-ios-updates.2385046/ And you may find the following article helpful: https://www.swiftdevjournal.com/dealing-with-failed-to-prepare-device-for-development-error-message-in-xcode/

Don't store your Xcode projects on iCloud Drive. If you want an online backup of your projects, use version control and a service like GitHub, Bitbucket, or GitLab. The following article shows you how to put an Xcode project on GitHub, Bitbucket, or GitLab: https://www.swiftdevjournal.com/putting-your-xcode-project-on-github-bitbucket-or-gitlab/

Look into focused values and focused bindings. That's how menus in SwiftUI apps access the document. The following articles may help you: https://www.swiftdevjournal.com/accessing-the-document-in-a-swiftui-menu/ https://troz.net/post/2021/swiftui_mac_menus/

It appears your postMethodCall function takes three arguments: controllerName, actionName, and httpBody. When you make the call you have to place a colon, : after each argument name. You have commas after the controllerName and actionName arguments. Replace the commas with colons. APIWrapper.postMethodCall(controllerName: "juniorDoctor", actionName: "jnrsignup", httpBody: data) If that doesn't fix the compiler error, you will have to supply the signature of the postMethodCall function so we can see what the arguments are. For future reference, place your code listings in a code block instead of showing a screenshot of your Xcode window. Code in an image is much more difficult to read and can't be copied and pasted, reducing the chances of people answering your question.

Do you have a file named Models in your project? Or is this a new file someone else created and placed on GitHub. The answer to the following Stack Overflow question may solve your problem: https://stackoverflow.com/questions/29287734/how-to-pull-new-files-from-git-master