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I was wondering if someone could explain or direct me to an explanation of why there's a need to work with UIKit late in the project (https://developer.apple.com/tutorials/swiftui/interfacing-with-uikit#introduction). What is it about that section of the tutorial that can't be accomplished using only SwiftUI? I find the pre-SwiftUI Swift code to be extremely confusing and very repetitive–given that a lot of the code can be prefilled by Xcode (for example, when creating a UIViewControllerRepresentable, it will automatically insert a ton of protocol-stub code from the error/Fix window), so I'm also trying to figure out just what it is that SwiftUI can't do that Swift can. So if anyone has found a site or book that explains what SUI still can't handle, I'd love to hear back, as I haven't been able to find one myself.

Curious to know if anyone understands why I'm getting the following error "Cannot preview in this file" - [appname] crashed" Running the code on my (wirelessly) attached iPhone XR works, but the in-Xcode Preview window doesn't. Here's the log produced by the Diagnostics option: <Well, I tried to attach the zip file created from the previews-diagnostics-##-## folder, but this text field wouldn't accept that file type. Is there a particular file within the folder that I should upload instead?> Here's the code from the ContentView file for my (very basic) project: import SwiftUI struct ContentView: View { @FocusState private var amountIsFocused: Bool @State private var checkAmount = 0.0 @State private var numberOfPeople = 0 @State private var tipPercentage = 0 let tipPercentages = [0, 10, 15, 20, 25] var totalPerPerson: Double { let peopleCount = Double(numberOfPeople + 2) let tipSelection = Double(tipPercentage) let tipValue = tipSelection / 100 * checkAmount let grandTotal = checkAmount + tipValue let amountPerPerson = grandTotal / peopleCount return amountPerPerson } var totalAmount: Double { let tipSelection = Double(tipPercentage) let tipValue = tipSelection / 100 * checkAmount let grandTotal = checkAmount + tipValue return grandTotal } var body: some View { NavigationView { Form { Section { TextField("Amount", value: $checkAmount, format: .currency(code: Locale.current.currencyCode ?? "USD")) .keyboardType(.decimalPad) .focused($amountIsFocused) Picker("Number of people", selection: $numberOfPeople) { ForEach(2 ..< 100) { Text("\($0) people") } } } Section { Picker("Tip percentage", selection: $tipPercentage) { ForEach(0 ..< 101) { Text($0, format: .percent) } } } header: { Text("Select tip percentage") } Section { Text("Grand total: \(totalAmount, format: .currency(code: Locale.current.currencyCode ?? "USD"))") } Section { Text(totalPerPerson, format: .currency(code: Locale.current.currencyCode ?? "USD")) } header: { Text("Amount per person") } .navigationTitle("WeSplit") .navigationBarTitleDisplayMode(.inline) } .toolbar { ToolbarItemGroup(placement: .keyboard) { Spacer() Button("Done") { amountIsFocused = false } } } } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } }