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SwiftUI: Generic parameter 'C0' could not be inferred


By : Neat
Date : September 15 2020, 10:00 PM
I think the issue was by ths following , I've been working with this code and I keep getting this error: ''Generic parameter 'C0' could not be inferred'' Additionally it says 'In call to function 'buildBlock' (SwiftUI.ViewBuilder)'on my HStack when I include this line of code: , Remove the following line - it is not allowed in bodyview builder
code :
self.userData.tempBatchUnit = productName
    TextField("Enter here", text: $productName, onCommit: {
            self.userData.tempBatchUnit = self.productName
        })
        .textFieldStyle(RoundedBorderTextFieldStyle())
        .padding()
        .padding(.leading)


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SwiftUI: Generic parameter 'Subject' could not be inferred


By : Jonny Fletcher
Date : March 29 2020, 07:55 AM
may help you . Since your LoadingView is not going to modify .isLoading, you do not need to pass it as a binding:
code :
LoadingView(isShowing: self.$charStore.isLoading)
struct LoadingView<Content>: View where Content: View {

    var isShowing: Bool
    ...
LoadingView(isShowing: self.charStore.isLoading) { ... }
@Published private(set) var isLoading = false

SwiftUI Error Code "Generic parameter 'C0' could not be inferred"


By : user3540850
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I've been working on some SUI code and I keep getting this error: , This line is incorrect:
code :
EliminationModel.printTest()
EliminationModel().printTest()
.frame(minWidth: 0)!, maxWidth: .infinity, minHeight: CGFloat(0)!, maxHeight: .infinity, alignment: Alignment.topLeading)
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .topLeading)
.textFieldStyle(RoundedBorderTextFieldStyle())
.font(Font.custom("Roboto Mono", size: CGFloat(20)!))
.font(Font.custom("Roboto Mono", size: 20))
struct ContentView: View {

    var eliminationModel = EliminationModel()
    @State private var code: String = "0000"
    let roboto = UIFont(name: "Roboto Mono", size: UIFont.systemFontSize)


    var body: some View {
        ZStack() {
            Image("background")
                .resizable()
                .edgesIgnoringSafeArea(/*@START_MENU_TOKEN@*/.all/*@END_MENU_TOKEN@*/)
            VStack() {
                HStack() {
                    VStack() {
                        Text("CODE:")
                            .font(Font.custom("Roboto Mono", size: 15))
                            .multilineTextAlignment(.center)
                        Text("6969")
                            .font(Font.custom("Roboto Mono", size: 10))
                            .padding(.top, 10.0)

                        Button(action: {
                            EliminationModel().printTest()
                        }) {
                            Text("Button")
                        }
                    }

                    .padding(.horizontal, 50)

                    VStack() {

                        // FIXME: Unclear what this is supposed to be part of
//                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        Text("INPUT: \(code)")
                            .font(Font.custom("Roboto Mono", size: 20))

                    }
                }
                .padding([.top, .leading, .trailing], 20.0)
                Spacer()
                HStack() {
                    VStack() {
                        Text("YOUR TARGET IS: ")
                            .font(Font.custom("Roboto Mono", size: 25))
                            .padding(.bottom, 11.0)
                        Text("JOHN APPLESEED")
                            .font(Font.custom("Roboto Mono", size: 40))
                            .fontWeight(.black)
                            .foregroundColor(Color.gray)
                            .multilineTextAlignment(.center)
                        Image("headshot")
                            .cornerRadius(10.0)
                    }
                }//hs
                Spacer()

                HStack() {
                    VStack(alignment: .center) {
                        Text("GRADE: ")
                            .font(Font.custom("Roboto Mono", size: 15))
                            .multilineTextAlignment(.center)
                        Text("FACULTY")
                            .font(Font.custom("Roboto Mono", size: 20))
                    }
                    VStack(alignment: .center) {
                        Text("DORM: ")
                            .font(Font.custom("Roboto Mono", size: 15))
                            .multilineTextAlignment(.center)
                        Text("DAY")
                            .font(Font.custom("Roboto Mono", size: 20))

                    }
                } //hs
                Spacer()

            }

            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .topLeading)
        } // zstack
    } // body view
} // struct

SwiftUI error: Generic parameter 'Label' could not be inferred Explicitly specify the generic arguments to fix this issu


By : user3637768
Date : March 29 2020, 07:55 AM
To fix this issue I can't find the issue for this error. I don't think the compiler is giving a meaningful error message. , This is a case of nesting closures interfering with $0. Try this:
code :
self.book.map { book in Button(action: { self.onRemoveCard(card, fromBook: book) }) { ... }

SwiftUI - trying to make codable enums but get error: "Generic parameter 'S' could not be inferred"


By : Detmach
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem is in your decoding method. You need to first decode your typeOfSalary key which is a String, switch the decoded String and decode the percentage in case it is equal to TypeOfSalaryCodingKeys.upTo.rawValue:
code :
init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    let typeOfSalary = try container.decode(String.self, forKey: .typeOfSalary)
    switch typeOfSalary {
    case TypeOfSalaryCodingKeys.noSalary.rawValue:
        self = .noSalary
    case TypeOfSalaryCodingKeys.upTo.rawValue:
        self = .upTo(percentage: try container.decode(Int.self, forKey: .percentage))
    default:
        throw DecodingError.dataCorruptedError(forKey: CodingKeys.typeOfSalary, in: container, debugDescription: "Invalid Type of Salary: \(typeOfSalary)")
    }
}
let ps1: ParentalSalary = .noSalary
let ps2: ParentalSalary = .upTo(percentage: 27)
let parentalSalaries: [ParentalSalary] = [ps1,ps2]

do {
    let psData = try JSONEncoder().encode(parentalSalaries)
    print(String(data: psData, encoding: .utf8)!)
    let loadedJSON = try JSONDecoder().decode([ParentalSalary].self, from: psData)
    print(loadedJSON)
} catch {
    print(error)
}

Generic parameter 'Label' could not be inferred SWIFTUI


By : pradeep varghese
Date : September 21 2020, 08:00 AM
I think the issue was by ths following , Your Slider init is incorrect. There is no version that has from: and through:. in: [0...1] is the default, though, so you don't need it anyway.
code :
  Slider(value: $seekPos, onEditingChanged: { _ in
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