我知道这个问题已经被问过很多次了，归根结底是为了让你的代码更好，但我不知道问题出在哪里。我希望有更多知识的人能帮助我。
fineDine.swift
import SwiftUI
import SwiftData
@main
struct fineDineApp: App {
var body: some Scene {
WindowGroup {
searchResults(searchValue: "")
.modelContainer(for: Review.self)
}
}
}
搜索结果.swift
import SwiftUI
import SwiftData
struct searchResults: View {
@State private var isPresentingNewMealView = false
@State var searchValue: String
@Query var review: [Review]
@Environment(\.modelContext) var modelContext
var body: some View { <---Where the error always pops up
NavigationStack {
ZStack {
LinearGradient(gradient: Gradient(colors: [Color(red: 0.9725490196078431, green: 0.9607843137254902, blue: 0.8627450980392157, opacity: 1), Color(red: 0.9137254901960784, green: 0.9254901960784314, blue: 0.8509803921568627, opacity: 1), Color(red: 0.9882352941176471, green: 0.7529411764705882, blue: 0.13333333333333333, opacity: 1), Color(red: 0.9450980392156862, green: 0.47058823529411764, blue: 0.08627450980392157, opacity: 1)]), startPoint: .top, endPoint: .bottom).ignoresSafeArea()
VStack{
Text("Which Food...")
.font(.system(size: 30, weight: .bold, design: .default))
.padding()
Image(systemName: "fork.knife.circle.fill")
.font(.system(size: 100))
.foregroundStyle(.black)
TextField("Enter Food or Restaurant", text: $searchValue)
.frame(width: 300, height: 50, alignment: .center)
.background(Color.white.opacity(0.4).cornerRadius(10))
.fontWeight(.medium)
.foregroundColor(Color.black)
.multilineTextAlignment(TextAlignment.center)
Spacer()
List {
ForEach(review) { review in
NavigationLink(destination: IndividualItemView())
{
VStack(alignment: .leading)
{
Text(review.foodName)
.font(.headline)
}
}
}.listRowBackground(Color.white.opacity(0.4).cornerRadius(5))
} .scrollContentBackground(.hidden)
.toolbar {
Button(action: {isPresentingNewMealView = true}
) {
Image(systemName: "plus")
}
.sheet(isPresented: $isPresentingNewMealView) {
EditMealView(isPresentingNewMealView: $isPresentingNewMealView, mealImage: Image(""), review: Review(foodName: "", restaurantName: "", rating: 3, foodType: "", reviewNotes: "Enter Notes"))
}
}
}
}
}
}
}
#Preview {
searchResults(searchValue: "")
}
个别项目视图.swift
import SwiftUI
import SwiftData
struct IndividualItemView: View {
@Bindable var review: Review <---- commenting this out and then fixing the other issues seems to resolve the error but then nothing shows.
@Environment(\.modelContext) private var modelContext
var body: some View {
NavigationStack {
ZStack {
LinearGradient(gradient: Gradient(colors: [Color(red: 0.9725490196078431, green: 0.9607843137254902, blue: 0.8627450980392157, opacity: 1), Color(red: 0.9137254901960784, green: 0.9254901960784314, blue: 0.8509803921568627, opacity: 1), Color(red: 0.9882352941176471, green: 0.7529411764705882, blue: 0.13333333333333333, opacity: 1), Color(red: 0.9450980392156862, green: 0.47058823529411764, blue: 0.08627450980392157, opacity: 1)]), startPoint: .top, endPoint: .bottom).ignoresSafeArea()
VStack {
VStack(alignment: .leading)
{
Text(review.foodName)
.font(.system(size: 30, weight: .bold, design: .default))
Text(review.restaurantName)
Text(review.foodType)
}
VStack {
Image("friedFood")
.resizable()
.frame(width: 300, height: 300)
.cornerRadius(5)
.padding()
Label("\(review.rating)", systemImage: "star.fill")
.foregroundStyle(Color.mint)
.multilineTextAlignment(.center)
.padding()
Text(review.reviewNotes)
.padding(.horizontal)
}
}
}
}
}
}
#Preview {
//IndividualItemView(review: Review(backingData: any ))
IndividualItemView(review: Review(foodName: "", restaurantName: "", rating: 0, foodType: "", reviewNotes: ""))
}
编辑餐食视图.swift
import SwiftUI
import PhotosUI
import SwiftData
struct EditMealView: View {
@Binding var isPresentingNewMealView: Bool
@Environment(\.modelContext) private var modelContext
@State var mealImage: Image?
@State var imageSelection: PhotosPickerItem? = nil
@Bindable var review: Review
let foodType: [String] = ["Select One...", "Fast Food", "Vegetarian", "Central African", "East African", "North African", "Southern Africa", "West African", "Latin American", "Native American", "Canadian", "Carribean", "Mexican", "American", "Southern American", "Fusion", "Central American", "South American", "Chinese", "Japanese", "Korean", "Indian", "Middle Eastern", "Thai", "Turkish", "Vietnamese", "Italian", "French", "German", "Spanish", "Greek", "Romanian", "Russian", "Eastern European", "Scandinavian", "British", "Dutch", "Swedish", "Norwegian", "Icelandic", "Irish", "Polynesian", "Australian", "New Zealand", "Other"]
var body: some View {
NavigationStack {
ZStack {
LinearGradient(gradient: Gradient(colors: [Color(red: 0.9725490196078431, green: 0.9607843137254902, blue: 0.8627450980392157, opacity: 1), Color(red: 0.9137254901960784, green: 0.9254901960784314, blue: 0.8509803921568627, opacity: 1), Color(red: 0.9882352941176471, green: 0.7529411764705882, blue: 0.13333333333333333, opacity: 1), Color(red: 0.9450980392156862, green: 0.47058823529411764, blue: 0.08627450980392157, opacity: 1)]), startPoint: .top, endPoint: .bottom).ignoresSafeArea()
.navigationTitle("Add Meal")
VStack{
Form {
TextField("Food Name", text: $review.foodName)
.listRowBackground(Color.clear)
TextField("Restaurant", text: $review.restaurantName)
.listRowBackground(Color.clear)
Picker(selection: $review.foodType, label: Text("Select Style")) {
ForEach(0..<foodType.count, id: \.self) {
Text(foodType[$0])
}
}
.listRowBackground(Color.clear)
VStack{
Text("Current \(Image(systemName: "star.fill")) Rating: \((review.rating), format: .number.rounded(increment: 0.1))")
Slider(value: $review.rating, in: 1...5, step: 0.5)
}
.listRowBackground(Color.clear)
.padding()
VStack{
HStack {
mealImage?
.resizable()
.frame(width: 300, height: 300)
}
HStack {
Spacer()
PhotosPicker( selection: $imageSelection) {
Image(systemName: "photo.circle.fill").imageScale(.large)
}
.task(id: imageSelection) {
mealImage = try? await imageSelection?.loadTransferable(type: Image.self)
}
Spacer()
}.padding()
}
.listRowBackground(Color.clear)
.padding()
TextEditor(text: $review.reviewNotes)
.listRowBackground(Color.clear)
}
}
.scrollContentBackground(.hidden)
.toolbar {
ToolbarItem(placement: .cancellationAction) {
Button("Dismiss") {
isPresentingNewMealView = false
}
}
ToolbarItem(placement: .confirmationAction) {
Button("Add") {
let newReview = review
modelContext.insert(newReview)
isPresentingNewMealView = false
}
}
}
}
}
}
}
#Preview {
do {
let config = ModelConfiguration(isStoredInMemoryOnly: true)
let container = try ModelContainer(for: Review.self, configurations: config)
let example = Review(foodName: "Cheetos", restaurantName: "House", rating: 3, foodType: "American", reviewNotes: "Delicious")
return EditMealView(isPresentingNewMealView: .constant(true), mealImage: Image(""), review: example)
.modelContainer(container)
} catch {
fatalError("Failed to create model container.")
}
}
我已经尝试了所有能找到的方法。由于这个错误非常模糊且依赖于代码效率，新开发人员很难弄清楚。
你的代码有几个问题。
searchResults你应该使用即赋予
@State var一个初始值。您应该使用以大写字母开头的常见做法
View，例如SearchResults。重要的是，你应该使用
也就是说，
IndividualItemView期望将审核传递给它。请注意，
NavigationStack中的IndividualItemView和EditMealView不用于任何导航。最好不要像你那样嵌套 ，堆栈在堆栈内。尝试使用。NavigationStackIndividualItemViewSearchResultsNavigationPath通过这些更改，您的代码可以在真实设备（而不是预览版）上的我的测试中编译和运行。