数据更改后SwiftUI列表未更新.(需要切换视图)

Question

点击列表中的复选框按钮后，我正试图将SwiftUI列表更改为更新。当我点击列表行复选框按钮时，我会调用一个函数，将ID小于所选ID的直接行设置为已选中。我可以将ArrayList修改为selected=0到selected=1。但由于我的列表是Published var，它应该会将更改发送到我的列表视图。但事实并非如此。

以下是我所做的：

//ViewModel

import Foundation
import Combine
class BillingViewModel: ObservableObject {

@Published var invoiceList = [InvoiceModel](){
didSet {
self.didChange.send(true)
}
}

@Published var shouldShow = true

let didChange = PassthroughSubject<Bool, Never>()

init() {
setValues()
}

func setValues() {
for i in 0...10 {
invoiceList.append(InvoiceModel(ispID: 100+i, selected: 0, invoiceNo: "Invoice No: (100+i)"))
}
}

func getCombinedBalance(ispID: Int) {
DispatchQueue.main.async {

if let row = self.invoiceList.firstIndex(where: {$0.ispID == ispID}) {
self.changeSelection(row: row)
}

}
}

func changeSelection(row: Int) {
if invoiceList[row].selected == 0 {

let selectedRows = invoiceList.map({ $0.ispID ?? 0 <= invoiceList[row].ispID ?? 0 })

print(selectedRows)

for index in 0..<invoiceList.count {
if selectedRows[index] {
invoiceList[index].selected = 1
} else {
invoiceList[index].selected = 0
}
}

} else {

let selectedRows = invoiceList.map({ $0.ispID ?? 0 <= invoiceList[row].ispID ?? 0 })

print(selectedRows)

for index in 0..<invoiceList.count {
if selectedRows[index] {
invoiceList[index].selected = 1
} else {
invoiceList[index].selected = 0
}
}
}
}

}

//列表视图

import SwiftUI
struct ContentView: View {

@StateObject var billingViewModel = BillingViewModel()
@State var shouldShow = true

var body: some View {
NavigationView {
ZStack {
VStack {
List {
ForEach(billingViewModel.invoiceList) { invoice in
NavigationLink(
destination: InvoiceDetailsView(billingViewModel: billingViewModel)) {
invoiceRowView(billingViewModel: billingViewModel, invoice: invoice)
}
}

}
}
}.navigationBarTitle(Text("Invoice List"))
}

}
}

//发票行视图

import SwiftUI
struct invoiceRowView: View {

@StateObject var billingViewModel: BillingViewModel
@State var invoice: InvoiceModel

var body: some View {
VStack(alignment: .leading) {
HStack {
Button(action: {
if invoice.selected == 0 {
print(invoice)
billingViewModel.getCombinedBalance(ispID: invoice.ispID ?? 0)
} else {
print(invoice)
billingViewModel.getCombinedBalance(ispID: invoice.ispID ?? 0)
}
}, label: {
Image(systemName: invoice.selected == 0 ? "checkmark.circle" : "checkmark.circle.fill")
.resizable()
.frame(width: 32, height: 32, alignment: .center)

}).buttonStyle(PlainButtonStyle())

Text(invoice.invoiceNo ?? "Hello, World!").padding()

Spacer()
}
}
}
}

//数据模型

import Foundation
struct InvoiceModel: Codable, Identifiable {
var id = UUID()
var ispID: Int?
var selected: Int?
var invoiceNo: String?
}

Answer 1

您需要使用绑定而不是外部注入状态(仅设置为值的副本(，即

struct invoiceRowView: View {

@StateObject var billingViewModel: BillingViewModel
@Binding var invoice: InvoiceModel
// .. other code

从而在父视图中注入绑定

ForEach(billingViewModel.invoiceList.indices, id: .self) { index in
NavigationLink(
destination: InvoiceDetailsView(billingViewModel: billingViewModel)) {
invoiceRowView(billingViewModel: billingViewModel, invoice: $billingViewModel.invoiceList[index])
}
}