Learning to code in Swift, SwiftUI, or Objective-C will allow you to port the app to the mac if you intend to release it to the mac app store otherwise google how to launch java based app on any OS.

Hence the reason why they are called private APIs.

Well, continue to add the NS Attrib key for the font and a font reference to the dictionary.

Contact Apple Developer Support and see the "Code Level Support" option in your account.

Talk to the jupyter owners over at their site.

The foregroundColor in attributes doesn't take a cgColor context.cgContext.setFillColor(UIColor.black.cgColor) not needed use UIColor.black.setFill() instead. Final changes let imageSize = CGSize(width: 400, height: 100) let testRenderer = UIGraphicsImageRenderer(size: imageSize) let testImage = testRenderer.image { context in     UIColor.black.setFill()     context.fill(CGRect(origin: .zero, size: imageSize))     let paragraphStyle = NSMutableParagraphStyle()     paragraphStyle.alignment = .left     let attributes: [NSAttributedString.Key: Any] = [         .font: UIFont.systemFont(ofSize: 8.0),         .paragraphStyle: paragraphStyle,         .foregroundColor: UIColor.white]     var attributedString = NSAttributedString(string: "This is some text",                                               attributes: attributes)     let drawContext = NSStringDrawingContext()     drawContext.minimumScaleFactor = 0.5     attributedString.draw(with: testRenderer.format.bounds, options: .usesLineFragmentOrigin,                           context: drawContext) } -enjoy!

Threading 101 - You are doing too much work on the main thread.

Move all of your core data operations into its own class. Take a look at the food truck example code. View-only code should exist only in the view.

The dreams and aspirations

What do you want to reboot? The phone? Not Possible The App? Possible but pointless

Just because the path is correct doesn't mean you have permission to access it.

Using a Text view is not supported with focus. Focus is used for setting the input focus (firstResponder) for input-oriented controls like TextField, TextEditor etc. Read the documentation first, it usually helps.

Your code modified to use a TextField instead of a Text view. import SwiftUI struct ContentView: View {     @FocusState private var focusedItem: Optional<FocusedItem>     @State var inputname: String = ""          var body: some View {         VStack {                          TextField("Test", text: $inputname)             #if os(macOS)                 .focusable(true)             #endif                 .focused($focusedItem, equals: .two)             Button("Toggle Focus") {                 self.focusedItem=(self.focusedItem == nil) ? .two : nil             }.onChange(of: focusedItem) { newValue in                 // Always prints `nil`.                 print(newValue as Any)             }         }     }          enum FocusedItem: Equatable {         case one, two         func other() -> FocusedItem {             switch self {             case .one: return .two             case .two: return .one             }         }     } } struct ContentView_Previews: PreviewProvider {     static var previews: some View {         ContentView()     } }

Read https://www.swiftbysundell.com/articles/referencing-generic-protocols-with-some-and-any-keywords/

Because certItem is nil hence the crash on force unwrap.