Core data CoreData的可观察对象-类型为';NSSet?&x27;没有下标
这是我的模型配置Core data CoreData的可观察对象-类型为';NSSet?&x27;没有下标,core-data,swiftui,indices,Core Data,Swiftui,Indices,这是我的模型配置 class ModelsConfig: ObservableObject { @Published var lists: [ListModel] = [] @Published var reminders: [Reminder] = [] } struct ListDetailView: View { @Binding var selectedIndex: Int @State var isSelected: Bool = false
class ModelsConfig: ObservableObject {
@Published var lists: [ListModel] = []
@Published var reminders: [Reminder] = []
}
struct ListDetailView: View {
@Binding var selectedIndex: Int
@State var isSelected: Bool = false
@EnvironmentObject var config : ModelsConfig
ForEach(config.lists[selectedIndex].reminders.indices, id: \.self) { reminderIndex in
HStack {
Button(action: {
DispatchQueue.main.asyncAfter(deadline: .now() + 1){
deleteReminder(at: reminderIndex)
}
}, label: {
// ReminderCell(reminder: list.reminders[reminderIndex])
ReminderCell(reminder: config.lists[selectedIndex].reminders[reminderIndex])
})
}
.padding(.bottom)
}
那些是我的模特
struct ListModel: Hashable {
var color: String
var text: String
var reminders: [Reminder]
}
struct Reminder: Hashable {
var title: String
var notes: String
var date: Date
var index: Int
var list: ListModel
}
在此之前,我可以通过ModelsConfig的帮助在这个视图中访问索引
class ModelsConfig: ObservableObject {
@Published var lists: [ListModel] = []
@Published var reminders: [Reminder] = []
}
struct ListDetailView: View {
@Binding var selectedIndex: Int
@State var isSelected: Bool = false
@EnvironmentObject var config : ModelsConfig
ForEach(config.lists[selectedIndex].reminders.indices, id: \.self) { reminderIndex in
HStack {
Button(action: {
DispatchQueue.main.asyncAfter(deadline: .now() + 1){
deleteReminder(at: reminderIndex)
}
}, label: {
// ReminderCell(reminder: list.reminders[reminderIndex])
ReminderCell(reminder: config.lists[selectedIndex].reminders[reminderIndex])
})
}
.padding(.bottom)
}
现在,我正试图借助核心数据达到与此相同的指数
@FetchRequest(sortDescriptors: [])
var list: FetchedResults<CDListModel>
ForEach(list[selectedIndex].reminders.indices , id: \.self) { reminderIndex in
HStack {
Button(action: {
DispatchQueue.main.asyncAfter(deadline: .now() + 1){
deleteReminder(at: reminderIndex)
}
}, label: {
ReminderCell(reminder: list[selectedIndex].reminders[reminderIndex])
})
}
.padding(.bottom)
}
@FetchRequest(排序描述符:[])
变量列表:FetchedResults
ForEach(列表[selectedIndex].employers.index,id:\.self){employerIndex in
HStack{
按钮(操作:{
DispatchQueue.main.asyncAfter(截止日期:.now()+1){
删除提醒(位于:提醒索引)
}
},标签:{
提醒单元格(提醒:列表[selectedIndex]。提醒[reminderIndex])
})
}
.padding(.bottom)
}
但它不允许我这样做。如何访问coredata中的索引
核心数据关系中的是
(NS)集合
s。出于性能原因,它们是无序的
最简单的解决方案是将集合转换为数组
ForEach((list[selectedIndex].reminders.allObjects as! [CDReminder]).indices , id: \.self) { reminderIndex in
考虑将关系声明为本机Set
。SwiftSet
s是一个序列和got索引