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 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. 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)                 }  ```