Hi, I'm in the process of updating my dilution calculator app to be fully done in SwiftUI. I'm trying to rewrite the old part of UIKit to SwiftUI. Can I get some help on how to do this? Here is the code form UIKit: @IBAction func button(_ sender: Any) { self.ContainerSizeTextField.resignFirstResponder() self.DilutionRatioTextField.resignFirstResponder() let firstValue = Double(ContainerSizeTextField.text ?? "0") ?? 0.0 let secondValue = Double(DilutionRatioTextField.text ?? "0") ?? 0.0 let thirdValue = Double(1) let outputValue = Double(secondValue + thirdValue) var outputValue1: Double = 0 if outputValue > 0.00000001 || outputValue < -0.0000000001 { outputValue1 = Double(firstValue / outputValue) } let outputValue2 = Double(firstValue - outputValue1) let c:String = String(format:"%.1f", outputValue1) let d:String = String(format:"%.1f", outputValue2) TotalProductLabel.text = " \(c)" TotalWaterLabel.text = " \(d)"

Hi, I'm working on a Dilution calculator and I get the error "Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value" It was running fine but then I decided to add a "clear button" and that's when the error started. @IBAction func button(_ sender: Any) { self.ContainerSizeTextField.resignFirstResponder() self.DilutionRatioTextField.resignFirstResponder() let firstValue = Double(ContainerSizeTextField.text!) let secondValue = Double(DilutionRatioTextField.text!) let thirdValue = Double(1) let outputValue = Double(secondValue! + thirdValue) let outputValue1 = Double(firstValue! / outputValue) let outputValue2 = Double(firstValue! - outputValue1) let c:String = String(format:"%.1f", outputValue1) let d:String = String(format:"%.1f", outputValue2) TotalProductLabel.text = " \(c)" TotalWaterLabel.text = " \(d)" } override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { self.view.endEditing(true) } @IBAction func clear(_ sender: Any) { ContainerSizeTextField.text = " " DilutionRatioTextField.text = " " TotalProductLabel.text = "0" TotalWaterLabel.text = "0" Error happens at "let outputValue = Double(secondValue! + thirdValue)" I'm able to run the app once before I get the error. Usually after hitting the "clear button".

Hi, I’m working on a dilution calculator. I have it 98% working, however, I want it to work a certain way and I’m not sure to do that. This is my first app so I’m new at this.  So I want the user to be able to input the numbers and hit a button to get the calculation. I’ve been using @State and through my research and understanding, using that instantly updates any changes the user makes.  So how do I go about making the app wait till the user hits the “Go” button.  Hers my code so far.  @State private var ContainerSize = 0 @State private var DilutionRatio = 0 @State private var Go = "" @State private var TotalProduct = 0.0 @State private var TotalWater = 0.0 @FocusState private var amountIsFocused: Bool        var totalProductAmount: Double {                let firstValue = Double(ContainerSize)         let secondValue = Double(DilutionRatio + 1)         let totalProduct = Double(firstValue / secondValue)     return totalProduct     }     var totalWaterAmount: Double {         let firstValue = Double(ContainerSize)         let secondValue = Double(DilutionRatio + 1)         let totalWater = Double(firstValue - secondValue)     return totalWater     }          //Container Size                 ZStack {                     Image("Container Size (Oz)")                         .padding(.vertical, -15)                     TextField("", value: $ContainerSize, format: .number)                         .frame(width: 200.0, height: 60.0)                         .multilineTextAlignment(.center)                         .font(Font.system(size: 50, design: .default))                         .keyboardType(.decimalPad)                         .focused($amountIsFocused)                 }             } //Dilution Ratio             ZStack {                 Image("Dilution Ratio - 2")                     .padding(.vertical, -10)                 TextField("", value: $DilutionRatio, format: .number)                     .frame(width: 200.0, height: 60.0)                     .multilineTextAlignment(.center)                     .font(Font.system(size: 50, design: .default))                     .keyboardType(.decimalPad)                     .focused($amountIsFocused)             } //Go Button             Button(action: {}, label: {                 Image("Go Button")             }) //Results             HStack{                             ZStack {                     Image("Total Product (Oz)")                     Text("\(totalProductAmount, specifier: "%.1f")")                         .font(Font.system(size: 60, design: .default))                 }                                ZStack {                     Image("Total Water (Oz)")                     Text(totalWaterAmount, format: .number)                         .font(Font.system(size: 60, design: .default))                 }                 .toolbar {                     ToolbarItemGroup(placement: .keyboard) {                         Spacer(                         Button("Done") {                             amountIsFocused = false     } } struct CalculatorIView_Previews: PreviewProvider {     static var previews: some View {         CalculatorIView() } } The calculator works as is but I want the user to input numbers, hit the “Go” button, and the results are shown.

I'm reletivly new to SwiftUI, so this might be a simple solution. I would like to have a Background Image behind a NavigatinLink but I can't seem to get the image to show. I looked everywhere on how to do this. I was able to briefly get it working using GeometryReader. However, when Xcode 14 was released it no longer was working and now I'm back to square one. I can't seem to find solution. Any help would be great, Thanks. Before Xcode Update: After Xcode Update (Background Missing)                   UINavigationBar.appearance().largeTitleTextAttributes = [.foregroundColor: UIColor.white]                  UITableView.appearance().backgroundColor = .clear                 UITableViewCell.appearance().backgroundColor = .black                 UITableView.appearance().tableFooterView = UIView()    }          var categories: [Category] = CategoryList.Ten          var body: some View {     NavigationView {         VStack {             VStack(alignment: .leading, spacing: -15) {             List(categories, id: \.id) { category in                 NavigationLink(destination: CategoriesDetailView(category: category), label: {                 Text(category.title)                     .fontWeight(.light)                     .lineLimit(2)                     .listRowBackground(Color.black)                     .minimumScaleFactor(0.5)                     .frame(maxWidth: 1000, minHeight: 0, alignment: .topLeading)                     .padding(.vertical, 0)                                                       }                                                 )                 .listRowBackground(Color.black)                 .listRowSeparatorTint(.white)                 .foregroundColor(.white)             }                 ZStack {                     VStack {}                 .navigationTitle("Categories")                 .foregroundColor(.white)                 }                      }                .background(                 GeometryReader { geo in                           Image("Catagories-1")                         .resizable()                         .aspectRatio(geo.size, contentMode: .fill)                         .edgesIgnoringSafeArea(.all)                         .padding(.vertical, 10)                   }         )         }     }.accentColor(.white)     } struct CategoriesListView_Previews: PreviewProvider {     static var previews: some View {         CategoriesListView()                  } } }

Hey everyone, I'm relatively new to SwiftUI, so this might be a simple solution. I’m working on a dilution calculator and it works with no issues. However, there is always a “0” over the placeholder in the textfield for Container Size and Dilution Ratio. I don't mind the "0", I actually want a "0" there. But I have to erase it every time I tap on the textfield to input a number. Even if I remove the placeholder it's still there. How do I make it so that I don't have to keep erasing the "0" every time I want to input a number but keep the placeholder. Thanks. Example: [https://i.makeagif.com/media/10-05-2022/-d_E8J.gif) struct CalculatorView: View {     @State private var containerSize = 0     @State private var dilutionRatio = 0     @State private var totalProduct = 0.0     @State private var totalWater = 0.0     @FocusState private var amountIsFocused: Bool         @FocusState private var focusedInput: Field?         func totalProductAmount() -> Double {         let firstValue = Double(containerSize)         let secondValue = Double(dilutionRatio + 1)         let totalProduct = Double(firstValue / secondValue)     return totalProduct     }     func totalWaterAmount() -> Double {         let firstValue = Double(containerSize)         let secondValue = Double(dilutionRatio + 1)         let totalProduct = Double(firstValue / secondValue)         let totalWater = Double(firstValue - totalProduct)     return totalWater     }        var body: some View {         NavigationView {         VStack(alignment: .center) {             Image("Logo")                 .padding(.horizontal, 30)                         HStack {  //Container Size                 ZStack {                     Image("Container Size (Oz)")                         .padding(.vertical, -15)                     TextField("", value: $containerSize, format: .number)                         .frame(width: 200.0, height: 60.0)                         .multilineTextAlignment(.center)                         .font(Font.system(size: 50, design: .default))                         .foregroundColor(.white)                         .keyboardType(.decimalPad)                         .focused($amountIsFocused)                         .focused($focusedInput, equals: .containerSize)                 }             } //Dilution Ratio             ZStack {                 Image("Dilution Ratio - 2")                     .padding(.vertical, -10)                 TextField("", value: $dilutionRatio, format: .number)                     .frame(width: 200.0, height: 60.0)                     .multilineTextAlignment(.center)                     .font(Font.system(size: 50, design: .default))                     .foregroundColor(.white)                     .keyboardType(.decimalPad)                     .focused($amountIsFocused)                     .focused($focusedInput, equals: .dilutionRatio)             } //Go Button             Button(action: {                 totalProduct = totalProductAmount()                 totalWater = totalWaterAmount()                 amountIsFocused = false             }, label: {                 Image("Go Button")             }) //Results             HStack{                            ZStack {                     Image("Total Product (Oz)")                     Text("\(totalProduct, specifier: "%.1f")")                         .font(Font.system(size: 60, design: .default))                         .foregroundColor(.white)                 }                                 ZStack {                     Image("Total Water (Oz)")                     Text("\(totalWater, specifier: "%.1f")")                         .font(Font.system(size: 60, design: .default))                         .foregroundColor(.white)                 }  ```