I am building a messaging app that needs notification when a new message in sent. When someone sends a message how do I send a push notification to other people to receive it while they are not on the app?

I am trying to build a messaging app. But I am not able to send any notifications when a new message appears. I have looked at sending push notifications but cannot find anything that will help me do this. How can I send a push notification?

I am trying to build an app where you can store your photos from the album or from the camera. How can I press the save button and store the image so the user can access it at any time?

I am trying to create an app which takes in the amount of money and tells you how much you have. But to display it correctly I need to convert what they type into a number. How do I convert a string into a double or a number?

I am building an app that saves the view as an image. I am trying to use the ImageRenderer to do that. But when I type it in, it says it cannot find ImageRenderer in scope. How do I fix this to use ImageRenderer?

I am building an app which allows users to share their list to other people. To do that I tried to turn the view into a PDF, but when sharing it, it is a white image. How can I fix this so the PDF shows the view instead of a white screen?

I am trying to build an app that allows users to share their lists to other. To do this I am trying to capture the list as an image and turn it into a PDF. When I send the PDF it comes with a white screen. Is there a way to fix this? Is there somethings wrong with this code? struct ShareSheet {       static let instance = ShareSheet()       private init() { }       func share(items: [Any]) {     let controller = UIActivityViewController(activityItems: items, applicationActivities: nil)     UIApplication.shared.currentUIWindow()?.rootViewController?.present(controller, animated: true, completion: nil)   }     } public extension UIApplication {   func currentUIWindow() -> UIWindow? {     let connectedScenes = UIApplication.shared.connectedScenes       .filter({         $0.activationState == .foregroundActive})       .compactMap({$0 as? UIWindowScene})           let window = connectedScenes.first?       .windows       .first { $0.isKeyWindow }     return window         } } extension View{       func sharePDF<Content: View> (@ViewBuilder content: @escaping () -> Content, fileName: String) {     exportPDF(content: content, completion: { status , url in       if let url = url, status {         ShareSheet.instance.share(items: [url])       } else {         print("⚠️ Failed to make PDF")       }     }, fileName: fileName)   }       // MARK: Extracting View's Height and width with the Help of Hosting Controller and ScrollView   fileprivate func convertToScrollView<Content: View>(@ViewBuilder content: @escaping ()->Content)->UIScrollView{           let scrollView = UIScrollView()           // MARK: Converting SwiftUI View to UIKit View     let hostingController = UIHostingController(rootView: content()).view!     hostingController.translatesAutoresizingMaskIntoConstraints = false           // MARK: Constraints     let constraints = [             hostingController.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),       hostingController.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),       hostingController.topAnchor.constraint(equalTo: scrollView.topAnchor),       hostingController.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),               // Width Anchor       hostingController.widthAnchor.constraint(equalToConstant: screenBounds().width)     ]     scrollView.addSubview(hostingController)     scrollView.addConstraints(constraints)     scrollView.layoutIfNeeded()           return scrollView   }       // MARK: Export to PDF   // MARK: Completion Handler will Send Status and URL   fileprivate func exportPDF<Content: View>(@ViewBuilder content: @escaping ()->Content,completion: @escaping (Bool,URL?)->(), fileName: String){           // MARK: Temp URL     let documentDirectory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!     // MARK: To Generate New File when ever its generated     let outputFileURL = documentDirectory.appendingPathComponent("\(fileName)\(UUID().uuidString).pdf")           // MARK: PDF View     let pdfView = convertToScrollView {       content()     }     pdfView.tag = 1009     let size = pdfView.contentSize     // Removing Safe Area Top Value     pdfView.frame = CGRect(x: 0, y: getSafeArea().top, width: size.width, height: size.height)           // MARK: Attaching to Root View and rendering the PDF     getRootController().view.insertSubview(pdfView, at: 0)           // MARK: Rendering PDF     let renderer = UIGraphicsPDFRenderer(bounds: CGRect(x: 0, y: 0, width: size.width, height: size.height))           do{               try renderer.writePDF(to: outputFileURL, withActions: { context in                   context.beginPage()         pdfView.layer.render(in: context.cgContext)       })               completion(true,outputFileURL)     }     catch{       completion(false,nil)       print(error.localizedDescription)     }           // Removing the added View     getRootController().view.subviews.forEach { view in       if view.tag == 1009{         print("Removed")         view.removeFromSuperview()       }     }   }       fileprivate func screenBounds()->CGRect{     return UIScreen.main.bounds   }       fileprivate func getRootController()->UIViewController{     guard let screen = UIApplication.shared.connectedScenes.first as? UIWindowScene else{       return .init()     }           guard let root = screen.windows.first?.rootViewController else{       return .init()     }           return root   }       fileprivate func getSafeArea()->UIEdgeInsets{     guard let screen = UIApplication.shared.connectedScenes.first as? UIWindowScene else{       return .zero     }           guard let safeArea = screen.windows.first?.safeAreaInsets else{       return .zero     }           return safeArea   } }

I am building an app that will let users share their views as a PDF. In their views, there is a list but when sharing that view the list disappears. How can I fix it to show the list when sharing?

I am working on an app that will allow users to share or save the view via a share sheet. To capture the view I am using the ImageRenderer. When I go to click on the share button, it does not work and says, "Unable to render flattened version of PlatformViewControllerRepresentableAdaptor<MulticolumnSplitViewRepresentable<ModifiedContent<Element, NavigationColumnModifier>, Never, _UnaryViewAdaptor>>." When I go to the issues it will say, "Context in environment is not connected to a persistent store coordinator: <NSManagedObjectContext: 0x6000014851e0>." How can I fix this. This is the code. struct DividendView: View {   @Environment(\.managedObjectContext) var moc            @FetchRequest(sortDescriptors: [     SortDescriptor(\.stock_name)   ]) var dividends: FetchedResults<Dividend>       @State private var showingAddScreen = false   @State private var showingShare = false           // @EnvironmentObject var vm = ViewModel()   @State private var renderedImage: Image?           @State private var selectedName: String?   @State private var expanded: Bool = false       let dividend: Dividend       //  @State private var items: [Any] = []   //  @State private var sheet: Bool = false       // let columns = [GridItem(.fixed(50)), GridItem(.fixed(50)), GridItem(.fixed(50)), GridItem(.fixed(50)), GridItem(.fixed(50))]     var body: some View {   NavigationView {     ScrollView(.horizontal) {       VStack {                   HStack {                       Text("Stock Name")             .frame(width: 70)             .padding(.leading, 15)             .padding()             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           // .background(Color.blue)           Text("Num of Shares")             .padding()             .frame(width: 100)             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           // .background(Color.blue)           Text("Dividend per Share")             .padding()             .frame(width: 130)             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           //  .background(Color.blue)                       Text("Franking")             .padding()             .frame(width: 100)             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           // .background(Color.blue)           Text("Dividend Date")             .frame(width: 80)             .padding()             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           // .background(Color.blue)           Text("Payment Date")             .frame(width: 80)             .padding()             .font(.system(size: 10, weight: .heavy, design: .rounded))             .font(.largeTitle)           //.background(Color.blue)           Text(" ")           // }         }                   // LazyVGrid(columns: columns) {         List {           ForEach(dividends) { dividend in             HStack {                               Text(dividend.stock_name ?? "No Name")               // .background(Color.red)                 .padding()                 .frame(width: 100)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                               Text(dividend.num_shares ?? "No shares")               // .background(Color.red)                 .padding()                 .frame(width: 100)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                               let dps = dividend.dividend_per_share               let theDPS = Double(dps ?? "0") ?? 0               let actualDPS = Double(theDPS)                               Text("$\(actualDPS, specifier: "%.2f")")               // .background(Color.red)                 .padding()                 .frame(width: 115)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                                                               Text(dividend.franking ?? "No franking")               // .background(Color.red)                 .padding()                 .frame(width: 115)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                               Text(dividend.dividend_date ?? "No date")               // .background(Color.red)                 .padding()                 .frame(width: 115)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                               Text(dividend.payment_date ?? "No date")               // .background(Color.red)                 .padding()                 .frame(width: 100)                 .font(.system(size: 10, weight: .medium, design: .serif))                 .font(.title2)                               Text(" ")                             }                         }           .onDelete(perform: deleteBooks)         }         .listStyle(.plain)       }               .navigationTitle("Dividend Income")                       .toolbar {         ToolbarItem(placement: .navigationBarLeading) {           EditButton()         }                   ToolbarItem(placement: .navigationBarTrailing) {           Button {             showingAddScreen.toggle()           } label: {             Label("Add Book", systemImage: "plus")           }         }         ToolbarItem(placement: .navigationBarLeading) {           Button {             if #available(iOS 16.0, *) {               let renderer = ImageRenderer(content: DividendView(dividend: Dividend()))                              // renderer.scale = 3               if let image = renderer.cgImage {                 renderedImage = Image(decorative: image, scale: 1.0)               }             }               // .buttonStyle(.borderedProminent)             // RenderedImageView(renderedImage: $renderedImage)             // .navigationTitle("Business Card")                        } label: {             Label("Share", systemImage: "square.and.arrow.up")           }         }       }       .sheet(isPresented: $showingAddScreen) {         AddDividendView()       }       .sheet(isPresented: $showingShare) {         if let renderedImage {           if #available(iOS 16.0, *) {             ShareLink(item: renderedImage, preview: SharePreview("My card", image: renderedImage))           }         }       }             }   } } func deleteBooks(at offsets: IndexSet) {   for offset in offsets {     let dividend = dividends[offset]     moc.delete(dividend)   }       try?moc.save() } } struct DividendView_Preview: PreviewProvider {   static var previews: some View {     DividendView(dividend: Dividend())   } }

I am building an app that will allow users to share their lists with each other. To do so, it will take a screenshot of the view and allow users to share that. When I go to share it, the app crashes. But when I go to save it to photos or files it works. How can I fix this so users can share and save photos. This is the code: Button(action: {         self.isShareSheetPresented.toggle()         let image = theList.snapshot()         items.removeAll()         items.append(image)       }) {         Text("Share")         Image(systemName: "square.and.arrow.up")       }     }          .sheet(isPresented: $isShareSheetPresented) {       let image = theList.snapshot()       ShareSheetView(activityItems: items)     } extension View {   func snapshot() -&gt; UIImage {     let controller = UIHostingController(rootView: self)     let view = controller.view     let targetSize = controller.view.intrinsicContentSize     view?.bounds = CGRect(origin: .zero, size: targetSize)     view?.backgroundColor = .clear     let renderer = UIGraphicsImageRenderer(size: targetSize)     return renderer.image { _ in       view?.drawHierarchy(in: controller.view.bounds, afterScreenUpdates: true)     }   } } struct ShareSheetView: UIViewControllerRepresentable {   typealias Callback = (_ activityType: UIActivity.ActivityType?, _ completed: Bool, _ returnedItems: [Any]?, _ error: Error?) -&gt; Void   let activityItems: [Any]   let applicationActivities: [UIActivity]? = nil   let excludedActivityTypes: [UIActivity.ActivityType]? = nil   let callback: Callback? = nil   func makeUIViewController(context: Context) -&gt; UIActivityViewController {     let controller = UIActivityViewController(       activityItems: activityItems,       applicationActivities: applicationActivities)     controller.excludedActivityTypes = excludedActivityTypes     controller.completionWithItemsHandler = callback     return controller   }   func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {     // nothing to do here   } }