我需要帮助删除产品我可以滑动并删除产品行，但产品未删除，当页面刷新时，产品仍然存在，如何修复此代码以滑动并删除产品
**这是我用来删除产品的完整内容**
import Foundation
import FirebaseStorage
import Firebase
class ProductViewModel: ObservableObject {
@Published var products: [Product] = []
let db = Firestore.firestore()
let storageRef = Storage.storage().reference()
func uploadImage(_ image: UIImage, completion: @escaping (Result<URL, Error>) -> Void) {
guard let imageData = image.jpegData(compressionQuality: 0.5) else {
completion(.failure(NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "Failed to convert image to data"])))
return
}
let imageName = UUID().uuidString
let imageRef = storageRef.child("product_images/\(imageName)")
imageRef.putData(imageData, metadata: nil) { metadata, error in
guard let _ = metadata else {
completion(.failure(error ?? NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "Failed to upload image"])))
return
}
imageRef.downloadURL { url, error in
if let url = url {
completion(.success(url))
} else {
completion(.failure(error ?? NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "Failed to get download URL"])))
}
}
}
}
func saveProduct(_ product: Product, imageURLs: [URL], completion: @escaping (Error?) -> Void) {
guard let currentUser = Auth.auth().currentUser else {
completion(NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "No user signed in"]))
return
}
let userId = currentUser.uid
var productData: [String: Any] = [
"name": product.name,
"price": product.price,
"description": product.description,
"userId": userId // Save the userId along with the product data
]
// Convert imageURLs to an array of string URLs
let imageURLStrings = imageURLs.map { $0.absoluteString }
productData["imageURLs"] = imageURLStrings
db.collection("products").addDocument(data: productData) { error in
completion(error)
}
}
func fetchProducts() {
db.collection("products").getDocuments { snapshot, error in
if let error = error {
print("Error fetching products: \(error.localizedDescription)")
return
}
guard let snapshot = snapshot else {
print("No data found")
return
}
let products = snapshot.documents.compactMap { document -> Product? in
let data = document.data()
let name = data["name"] as? String ?? ""
let price = data["price"] as? Double ?? 0.0
let quantity = data["quantity"] as? Int ?? 0
let imageName = data["imageURLs"] as? [String] ?? [] // Assuming imageURL is the correct field name
let description = data["description"] as? String ?? ""
return Product(name: name, price: price, imageURLs: imageName, description: description)
}
DispatchQueue.main.async {
self.products = products
}
}
}
func fetchCurrentUserProducts() {
guard let currentUser = Auth.auth().currentUser else {
print("No user signed in")
return
}
let userId = currentUser.uid
db.collection("products")
.whereField("userId", isEqualTo: userId) // Assuming you save userId along with product data
.getDocuments { snapshot, error in
if let error = error {
print("Error fetching products: \(error.localizedDescription)")
return
}
guard let snapshot = snapshot else {
print("No data found")
return
}
let products = snapshot.documents.compactMap { document -> Product? in
let data = document.data()
let name = data["name"] as? String ?? ""
let price = data["price"] as? Double ?? 0.0
let quantity = data["quantity"] as? Int ?? 0
let imageName = data["imageURLs"] as? [String] ?? [] // Assuming imageURL is the correct field name
let description = data["description"] as? String ?? ""
return Product(name: name, price: price, imageURLs: imageName, description: description)
}
DispatchQueue.main.async {
self.products = products
}
}
}
func saveEditedProduct(_ editedProduct: Product, completion: @escaping (Error?) -> Void) {
guard let currentUserID = Auth.auth().currentUser?.uid else {
completion(NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey: "No current user"]))
return
}
// Ensure the edited product belongs to the current user
let productID = editedProduct.id.uuidString
let documentRef = db.collection("products").document(productID)
documentRef.updateData([
"name": editedProduct.name,
"price": editedProduct.price,
"description": editedProduct.description,
// You can update other fields as needed
]) { error in
if let error = error {
print("Error updating product: \(error.localizedDescription)")
completion(error)
} else {
print("Product updated successfully")
completion(nil)
}
}
}
func deleteProduct(_ product: Product, completion: @escaping (Error?) -> Void) {
let db = Firestore.firestore()
let documentID = product.id.uuidString
db.collection("products").document(documentID).delete { error in
if let error = error {
completion(error)
} else {
// Successfully deleted
completion(nil)
}
}
}
}
import SwiftUI
struct ProductNwRw: View {
var product: Product
var onDelete: () -> Void
var body: some View {
NavigationLink(destination: EditProduct(viewModel: ProductViewModel(), product: product)) {
Text(product.name)
}
.swipeActions {
Button {
onDelete()
} label: {
Label("Delete", systemImage: "trash")
}
.tint(.red)
}
}
}
#Preview {
ProductNwRw(product: Product(name: "Sample Product", price: 19.99, imageURLs: ["19.99"], description: "This is a sample product description."
), onDelete: {})
} ```
导入 SwiftUI 进口翠鸟 导入 StoreKit 结构 ProductDetailContentView：查看 {
@ObservedObject var viewModel = ProductViewModel()
var body: some View {
List {
ForEach(viewModel.products, id: \.id) { product in
ProductNwRw(product: product) {
viewModel.deleteProduct(product) { error in
if let error = error {
print("Error deleting product: \(error.localizedDescription)")
} else {
print("Product deleted successfully")
// Optionally, you can remove the product from the list
viewModel.products.removeAll { $0.id == product.id }
}
}
}
}
.onDelete { indexSet in
indexSet.forEach { index in
let product = viewModel.products[index]
viewModel.deleteProduct(product) { error in
if let error = error {
print("Error deleting product: \(error.localizedDescription)")
} else {
print("Product deleted successfully")
}
}
}
}
}
.onAppear {
viewModel.fetchCurrentUserProducts()
}
}
}
#预览{ 产品详情内容查看()
}
从 Firestore 中删除产品后，您还应该更新视图模型中的 products 数组以反映删除操作。这确保了数据更改时 UI 也能更新。
修改ProductViewModel中的deleteProduct函数，以在成功删除后更新产品数组：
func deleteProduct(_ product: Product, completion: @escaping (Error?) -> Void) {
let db = Firestore.firestore()
let documentID = product.id.uuidString
db.collection("products").document(documentID).delete { error in
if let error = error {
completion(error)
} else {
// Successfully deleted
// Update the products array to reflect deletion
self.products.removeAll { $0.id == product.id }
completion(nil)
}
}
}
并刷新 UI。
struct ProductDetailContentView: View {
@ObservedObject var viewModel = ProductViewModel()
var body: some View {
List {
ForEach(viewModel.products, id: \.id) { product in
ProductNwRw(product: product) {
viewModel.deleteProduct(product) { error in
if let error = error {
print("Error deleting product: \(error.localizedDescription)")
} else {
print("Product deleted successfully")
// Trigger fetching products again after deletion
viewModel.fetchCurrentUserProducts()
}
}
}
}
}
.onAppear {
viewModel.fetchCurrentUserProducts()
}
}
}
通过进行这些更改，当删除产品后刷新页面时，产品删除应该正确反映在您的 UI 中。视图模型中的产品数组将更新，UI 将相应刷新。尝试这样..