按键调用中缺少参数＃1的参数

debugcn 发表于 Dev

胶带83

我曾经在列表视图本身中定义过这些行，但是现在我将这些行分解为自己的视图，我得到了这个模糊的错误。呼叫中的参数＃1缺少自变量

它告诉我插入'<＃LocalizedStringKey＃>，'来解决这个问题，但是我不确定为什么需要它，或者我应该输入什么作为Localized String Key。

    var body: some View {
        
        NavigationView{
            if #available(iOS 14.0, *) {
                List{
                    ForEach(result) { (log: Expenses) in
                        Button(action: {
                            self.editExpense = log
                            print(log.id)
                        }) {
                            HStack() {
                                VStack(alignment: .leading, spacing: 8) {
                                    Text(log.nameText).padding(.horizontal, -7)
                                    Text(log.dateText).font(.caption).padding(.horizontal, -7)
                                }
                                Spacer()
                                VStack(alignment: .trailing, spacing: 8){
                                    Text(log.amountText)
                                    Text(log.expenseAccount?.capitalized ?? "").font(.caption)
                                }
                                
                            }
                            
                        }
                    }
                    
                    .onDelete(perform: onDelete)
                }.padding(.horizontal, -20).navigationTitle("Expense List")

但是，现在我创建了一个行视图，并希望为“费用”中的每个项目调用它。由于某种原因，我在下面的行中遇到了错误。

import SwiftUI
import CoreData

@available(iOS 14.0, *)
struct ExpenseList: View {
    
    @State var editExpense: Expenses?
    @State var addExpense = false
    
    @Environment(\.managedObjectContext)
    var context: NSManagedObjectContext
    
    @FetchRequest(fetchRequest: Expenses.expensesList)
    private var result: FetchedResults<Expenses>

    
    init(predicate: NSPredicate?, sortDescriptor: NSSortDescriptor) {
        let fetchRequest = NSFetchRequest<Expenses>(entityName: Expenses.entity().name ?? "Expenses")
        fetchRequest.sortDescriptors = [sortDescriptor]

        if let predicate = predicate {
            fetchRequest.predicate = predicate
        }
        _result = FetchRequest(fetchRequest: fetchRequest)
    }
    
    
    
    var body: some View {
        
        NavigationView{
                List{
                    ForEach(result) { (log: Expenses) in
                        Button(action: {     <----- Missing argument for parameter #1 in call
                            self.editExpense = log
                        })
                        ExpenseRow(name: log.nameText, date: log.dateText, amount: log.amountText, account: log.expenseAccount ?? "")
                    }
                    
                    .onDelete(perform: onDelete)
                }.navigationTitle("Expense List")

ExpenseRow视图，以备不时之需

import SwiftUI


@available(iOS 14.0, *)
struct ExpenseRow: View {

    let name: String
    let date: String
    let amount: String
    let account: String
    
    
    var body: some View {

            HStack() {
                VStack(alignment: .leading, spacing: 8) {
                    Text(name).padding(.horizontal, -7)
                    Text(date).font(.caption).padding(.horizontal, -7)
                }
                Spacer()
                VStack(alignment: .trailing, spacing: 8){
                    Text(amount)
                    Text(account.capitalized).font(.caption)
                }
                
            }
            
        
    }
}

然后

您需要定义按钮的外观，如下所示：

Button(action: {
    self.editExpense = log
}) {
    /// ↓ put `ExpenseRow` inside the brackets!
    ExpenseRow(name: log.nameText, date: log.dateText, amount: log.amountText, account: log.expenseAccount ?? "") 
}

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