这是一个简单的问题,但是我可能在代码中忘记了某些东西。
让我们用一张图片更好地解释:
当选择或取消选项时,我基本上需要更新“COUNT”和“PRICE”。
我的代码结构如下:
型号:
class ServiceSelectorModel: Identifiable, ObservableObject {
var id = UUID()
var serviceName: String
var price: Double
init(serviceName: String, price: Double) {
self.serviceName = serviceName
self.price = price
}
@Published var selected: Bool = false
}
ViewModel:
class ServiceSelectorViewModel: ObservableObject {
@Published var services = [ServiceSelectorModel]()
init() {
self.services = [
ServiceSelectorModel(serviceName: "SERVICE 1", price: 1.80),
ServiceSelectorModel(serviceName: "SERVICE 2", price: 10.22),
ServiceSelectorModel(serviceName: "SERVICE 3", price: 2.55)
]
}
}
ToggleView
struct ServiceToggleView: View {
@ObservedObject var model: ServiceSelectorModel
var body: some View {
VStack(alignment: .center) {
HStack {
Text(model.serviceName)
Toggle(isOn: $model.selected) {
Text(String(format: "€ +%.2f", model.price))
.frame(maxWidth: .infinity, alignment: .trailing)
}
}
.background(model.selected ? Color.yellow : Color.clear)
}
}
}
ServiceSelectorView
struct ServiceSelectorView: View {
@ObservedObject var serviceSelectorVM = ServiceSelectorViewModel()
var body: some View {
VStack {
VStack(alignment: .leading) {
ForEach (serviceSelectorVM.services, id: \.id) { service in
ServiceToggleView(model: service)
}
}
let price = serviceSelectorVM.services.filter{ $0.selected }.map{ $0.price }.reduce(0, +)
Text("SELECTED: \(serviceSelectorVM.services.filter{ $0.selected }.count)")
Text(String(format: "TOTAL PRICE: €%.2f", price))
}
}
}
在这段代码中,我可以更新模型的selected
状态,但包含所有模型并应刷新PRICE
的视图模型没有更新。
似乎数组中的模型没有改变。
我忘记了什么?