SwiftUI:随机 "Extra argument in call"错误

Question

所以我正在尝试学习 SwiftUI 和 Combine。我通常通过制作一个简单的小费计算器来开始新技术。

我似乎收到了一个随机的“通话中的额外参数”。编码时出错
这是我的 SwiftUI 文件

import SwiftUI

internal enum ReceiptRowType {
    case subtotal
    case tax
    case total
    case tip
    case grandTotal
}

struct TipView: View {
    @ObservedObject internal var adBannerView: BannerAdView = BannerAdView()
    @ObservedObject internal var receiptViewModel: ReceiptViewModel

    private let percentageFormatter: NumberFormatter = {
        let f = NumberFormatter()
        f.numberStyle = .percent
        return f
    }()

    var body: some View {
        ZStack {
            Color.white
                .scaledToFit()

            VStack {
                if adBannerView.adHasLoaded {
                    adBannerView
                        .frame(maxHeight: adBannerView.adHeight)
                        .animation(.easeInOut(duration: 2.0))
                }

                BorderView()

                Text(ARCHLocalizedStrings.receipt)
                    .foregroundColor(Color.gray)

                BorderView()

                HStack {
                    Spacer()

                    Button(action: {
                        self.receiptViewModel.addNewReceiptItem()
                    }) {
                        Text(ARCHLocalizedStrings.buttonTitleAddItem)
                    }
                }

                BorderView()

                ScrollView {
                    ForEach(receiptViewModel.receiptItems) { receiptItem in
                        ItemView(receiptItem: receiptItem)

                        if receiptItem != self.receiptViewModel.receiptItems.last {
                            Divider()
                        }
                    }
                }

                BorderView()

                BottomOfReceiptRow(receiptViewModel: receiptViewModel,
                                   type: ReceiptRowType.subtotal,
                                   title: ARCHLocalizedStrings.subtotal)

                BottomOfReceiptRow(receiptViewModel: receiptViewModel,
                                   type: ReceiptRowType.tax,
                                   title: ARCHLocalizedStrings.tax)
            }
            .padding(.horizontal, ARCHSwiftUILayoutConstants.defaultPaddingAndSpacing)
        }
    }
}

struct BorderView: View {
    var body: some View {
        Text("================================")
            .lineLimit(1)
            .foregroundColor(Color.gray)
            .minimumScaleFactor(0.5)
    }
}

struct ItemView: View {
    @ObservedObject var receiptItem: ReceiptItemViewModel

    var body: some View {
        HStack {
            TextField(receiptItem.name, text: $receiptItem.name)
                .textFieldStyle(RoundedBorderTextFieldStyle())
                .foregroundColor(Color.gray)
                .multilineTextAlignment(TextAlignment.leading)

            TextField("Price", value: $receiptItem.price, formatter: ARCHUtilities.currencyFormatter)
                .textFieldStyle(RoundedBorderTextFieldStyle())
                .foregroundColor(Color.gray)
                .multilineTextAlignment(TextAlignment.trailing)
                .minimumScaleFactor(0.5)
                .frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
        }
    }
}

struct BottomOfReceiptRow: View {
    @ObservedObject internal var receiptViewModel: ReceiptViewModel

    internal var type: ReceiptRowType
    internal var title: String

    var body: some View {
        HStack {
            Spacer()

            Text(title)
                .foregroundColor(Color.gray)

            if type == ReceiptRowType.subtotal {
                Text("\(receiptViewModel.subtotal)")
                    .foregroundColor(Color.gray)
                    .frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
            } else if type == ReceiptRowType.tax {
                Text("\(receiptViewModel.taxRate)")
                    .foregroundColor(Color.gray)
                    .frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
            } else if type == ReceiptRowType.total {
                Text("\(receiptViewModel.total)")
                    .foregroundColor(Color.gray)
                    .frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
            } else if type == ReceiptRowType.tip {

            } else if type == ReceiptRowType.grandTotal {
                Text("\(receiptViewModel.grandTotal)")
                    .foregroundColor(Color.gray)
                    .frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
            }
        }
    }
}

struct TipView_Previews: PreviewProvider {
    static var previews: some View {
        TipView(receiptViewModel: ReceiptViewModel())
    }
}

但是，如果我在 TipView 主体(任何 View )上添加另一个 View ，我似乎会收到“调用中的额外参数”错误。

Picture of error here

有谁知道发生了什么？

Answer 1

尝试围绕您的观点创建一个 Group { }。 Swiftui 中只允许 10 个...使用组，您可以添加更多。或使用 subview ...(也会更干净的代码)