When you create a new Core Data project in Xcode, the project is set to automatically create subclasses for your Core Data entities when you build the project. When you create a NSManagedObject subclass manually, you now have two copies of the subclass: the one Xcode generates and the one you created. You can have only one copy of the subclass. To fix the problem either remove the NSManagedObject subclass files you created or tell Xcode not to generate subclasses for your entities. Read the following article for more details: https://www.swiftdevjournal.com/core-data-code-generation/

Either update to Xcode 15 or add the iOS 17 device files to your Xcode bundle. Read the following article for more details: https://www.swiftdevjournal.com/dealing-with-failed-to-prepare-device-for-development-error-message-in-xcode/

You can install Xcode on an external HD if you make the external HD your Mac's startup disk. Read the following article for more details: https://www.swiftdevjournal.com/xcode-installation-questions/

What happens when you run the app from Xcode on your iPad? Are you able to open the file? If you can, that narrows the problem down to TestFlight. I recommend running the app from Xcode on your iPad and set a breakpoint in your file importing code. If you step through the code line by line, Xcode's console should show error messages if there's a problem with opening the file. Show your file importing code. Without the code, people here will just be guessing about the cause of the problem.

Paste the code as text and format it as a code block. Text in a code block is easier to read than a screenshot. Plus, people can copy and paste the code when it is in a code block. The code block button is the 4th button from the left in the list of buttons below the text editor on the forum. You can also add three backticks on the line above and below the code. https://www.markdownguide.org/extended-syntax/#fenced-code-blocks I am going to put, my code, as I say, in the breakpoints everything works fine, it does not show any errors, it simply does not load the file, nor does its name appear, when I pass it to testfligh and install it Please clarify one thing. When you run the project from Xcode on your iPad, are you able to open the file? Does the problem occur only when you install your app from TestFlight and run it on the iPad? My guess is the reason the file does not load and does not show any errors is the condition in the guard statement is false. Here is the code. guard let archivoURL1 = try result.get() as? URL else { return } If the call to result.get fails, you return before you get to any code that prints error messages. That is why no errors appear in Xcode's console.

Would you recommend starting with Swift or SwiftUI. SwiftUI uses Swift so you have to know both. The question you really have is using UIKit or SwiftUI. For a new project I would recommend SwiftUI. Read the following article for additional details: https://www.swiftdevjournal.com/should-i-learn-swift-or-swiftui/ how I could download the App to my own Phone. is the 100€ a year Apple Developer enrolment necessary ? Or is there a free way without downloading it every week. No, a paid developer account is the only way to avoid having to reinstall your app every week. is there a way to publish the App as private. So only I see it myself ? Use unlisted app distribution to make the app private. https://developer.apple.com/support/unlisted-app-distribution/

I do not see anything wrong with the logic in the code you supplied. I see two possible formatting errors: importing the two frameworks on the same line and declaring the url property on the same line as the struct declaration. Does the code build if you place the import statements on separate lines and the url declaration on its own line? import SwiftUI import PDFKit struct PDFViewerView: UIViewRepresentable { var url: URL func makeUIView(context: Context) -> PDFView { let pdfView = PDFView() pdfView.document = PDFDocument(url: self.url) return pdfView } func updateUIView(_ uiView: PDFView, context: Context) { // Update the view. } }

You have two problems in your code. First, the @State property wrapper is for structs, not classes. You need to use the @StateObject property wrapper for classes. Either use @StateObject in the view or make QuizPlayer a struct instead of a class and remove @Published from the QuizPlayer fields. Second, you are overcomplicating things with binding a player's name to a text field. Instead of accessing the players using an index, go through the array of players and bind each player's name to the text field. The code will look similar to the following: ForEach(quizPlayers, id:\.self) { $player in TextField("Player Name: ", text: $player.name) } The $player argument gives you the current player so you do not have to access the quizPlayers array or deal with array indexes. Keep in mind I typed the code from memory so I cannot guarantee it will work correctly if you copy and paste it in your code. You may need to change $player to player. But the code gives you an idea of what you need to do to bind the player's name to the text field.

Provide more specifics on what you mean by "form does not work". What do you expect to see? What do you see when you run your app? I suggest moving your networking code out of the form into its own function. Call the function when someone taps the Sign In button.

You can use unlisted app distribution for personal apps as long as you have a paid developer account.

You have to wrap the variable you are logging with the @ character, @i@, instead of $i. The message you log should be the following: The current value for I is: @i@ Read the following article for more details: https://www.swiftdevjournal.com/replace-swift-print-statements-with-xcode-breakpoint-actions/ The article talks about Swift code, not C++, but the material applies to C++ code as well.

I have not used the Observation framework or SwiftUI's image renderer, but I think you need to move your pdfReport function out of the view model and into a SwiftUI view. I don't think you can create the image renderer in a view model. One question about your code. Why do you pass an array of Person objects to pdfReport and have the personsToPrint property in the ViewModel class? You don't use the person argument in the pdfReport function. Wouldn't it be easier to get rid of the personsToPrint property and use the array of Person objects in the for loop? Then you wouldn't have to worry about the array being nil. @MainActor func pdfReport(people: [Person]) { for person in people { // Rest of code omitted } }

Creating a PDF with multiple pages isn't easy. You are going to have use Quartz (CoreGraphics). Create a PDF context. Do the following until you reach the end of the text: Determine how much text can fit on a page. Call the PDF context's beginPage function. Draw the page of text. Call the PDF context's endPage function. Update the location in the text to start drawing the next page. The following article explains what you have to do to create a multiple page PDF with Quartz and Core Text: https://www.meandmark.com/blog/2016/08/creating-pdfs-with-core-text-and-quartz/ The TPPDF Swift package can be used to create PDF files. You will probably find it easier to use than to create a PDF with Quartz. https://github.com/techprimate/TPPDF

The usual causes of build errors are errors in your code and missing frameworks. You can see the build errors in Xcode's issue navigator. Press Cmd-5 in Xcode to show the issue navigator. No one here can give you an answer right now based on the information you provided. For anyone to help you, you must list the errors and show the source code for any compiler errors. Use text, not screenshots, to show your errors and code. Text is easier to read than trying to read text from a screenshot. The following article may help you get started with fixing the errors in your code: https://www.swiftdevjournal.com/why-wont-my-xcode-project-build/