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[英]SwiftUI: How do I loop through an array of Int inside "For Each"
[英]SwiftUI MVVM how to loop through data and store them inside array
我在我的 SwiftUI 项目中使用 MVVM,在我请求从 API 获取数据后,我想循环访问数据并将其中一些数据存储在一个数组中,但是它返回错误,正确的方法是什么?
这是我的代码和数据结构
菜单详情查看
struct MenuDetailView: View {
@ObservedObject var viewModel = MenuDetailViewModel()
var body: some View {
ForEach(self.viewModel.variantGroup, id: \.self) { vg in
/*** I Need to loop and store vg.variantGroupName into array viewModel.variantChosen, how? ***/
self.viewModel.variantChosen.append(vg.VariantGroupName)
// This always return error:
// Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols
VStack {
HStack {
Text(vg.variantGroupName)
Text(String(self.viewModel.arrVariantChoosen[0]))
}
VStack {
ForEach(vg.variant, id: \.self) { v in
Text(v.variantName)
}
}
}
}
}
}
}
MenuDetailViewModel.swift
class MenuDetailViewModel: ObservableObject, MenuDetailService {
var apiSession: APIService
@Published var detaildata: MenuDetailData?
@Published var variantGroup = [MenuDetailVariantGroup]()
@Published var variantChosen: Array<String> = []
var cancellables = Set<AnyCancellable>()
init(apiSession: APIService = APISession()) {
self.apiSession = apiSession
}
func getMenuDetail() {
let cancellable = self.getMenuDetail()
.sink(receiveCompletion: { result in
switch result {
case .failure(let error):
print("Handle error: \(error)")
case .finished:
break
}
}) { (detail) in
self.detaildata = detail.data
self.variantGroup = detail.data.variantGroup
}
cancellables.insert(cancellable)
}
}
MenuDetailData.swift
struct MenuDetailData: Codable, Identifiable {
let id = UUID()
let idMenu: String
let menuName: String
let variantGroup: [MenuDetailVariantGroup]
}
MenuDetailVariantGroup.swift
struct MenuDetailVariantGroup: Codable, Identifiable, Hashable {
let id = UUID()
let variantGroupName: String
let variant: [MenuDetailVariant]
let limit: Int
}
MenuDetailVariant.swift
struct MenuDetailVariant: Codable, Identifiable, Hashable {
let id = UUID()
let variantName: String
}
谢谢大家
您不能在ForEach
中添加它。 在 SwiftUI 中, ForEach
是一个视图。 它接受视图数据,它与Array.forEach
。 您需要在视图 model 中执行此操作。 像这样
func getMenuDetail() {
let cancellable = self.getMenuDetail()
.sink(receiveCompletion: { result in
switch result {
case .failure(let error):
print("Handle error: \(error)")
case .finished:
break
}
}) { (detail) in
self.detaildata = detail.data
self.variantGroup = detail.data.variantGroup
self.variantChosen = self.variantGroup.map{$0.variantGroupName} //<--here
}
cancellables.insert(cancellable)
}
从ForEach
中删除它
self.viewModel.variantChosen.append(vg.VariantGroupName)
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