所以我收到错误未知属性ObservableObject
旁边的@ObservableObject var dataSource = DataSource()
下面打电话。这ObservableObject
几天前在另一个项目中工作得很好,但现在不行了。
import SwiftUI
import Combine
class DataSource: ObservableObject {
var willChange = PassthroughSubject<Void,Never>()
var expenses = [Expense]() {
willSet { willChange.send() }
}
var savingsItems = [SavingsItem](){
willSet { willChange.send() }
}
//@State var monthlyIncomeText: String
//var monthlyIncome: Int = 1364
init(){
addNewExpense(withName: "Spotify", price: 14)
}
func addNewExpense(withName name: String, price: Int){
let newExpense = Expense(name: name, price: price)
expenses.append(newExpense)
}
func addNewSavingsItem(withName name: String, price: Int, percentage: Double){
let newSavingsItem = SavingsItem(name: name, price: price, timeTilCompletion: 0, percentage: percentage)
savingsItems.append(newSavingsItem)
}
}
struct ContentView: View {
@ObservableObject var dataSource = DataSource()
var body: some View {
VStack{
Text("Expenses")
List(dataSource.expenses) { expense in
ExpenseRow(expense: expense)
}
}
}
}
有人可以帮忙吗?
ObservableObject
是一个协议ObservedObject
s 必须符合。看here https://developer.apple.com/documentation/combine/observableobject有关的文档ObservableObject
, and here https://developer.apple.com/documentation/swiftui/observedobject有关的文档ObservedObject
,这是您正在寻找的属性包装器。改变你的ContentView
代码如下:
struct ContentView: View {
@ObservedObject var dataSource = DataSource()
var body: some View {
VStack {
Text("Expenses")
List(dataSource.expenses) { expense in
ExpenseRow(expense: expense)
}
}
}
}
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