我目前正在使用Xcode（用户界面：情节提要）和Google Firebase进行项目。我无法让我的应用显示以下信息： Desired output
我得到这张图片的方式是通过启动一个测试项目，选择SwiftUI作为我的用户界面，并且只有一个单视图控制器。在我的应用中，用户只有登录后并单击将其带到表格视图的按钮，才能访问此页面。
我的应用当前将结果显示在Xcode的底部： Current output
import UIKit
import FirebaseFirestore
class AssetViewController: UIViewController {
@IBOutlet weak var assetList: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let db = Firestore.firestore()
db.collection("assets").getDocuments { (snapshot, error) in
if error != nil {
print("error")
} else {
for document in (snapshot?.documents)! {
if let brand = document.data() ["brand"] as? String {
if let description = document.data() ["description"] as? String {
if let date = document.data() ["date"] as? String {
if let cost = document.data() ["cost"] as? String {
if let serial = document.data() ["serial"] as? String {
if let warranty = document.data() ["warranty"] as? String {
if let warranty_cost = document.data() ["warranty_cost"] as? String {
print("\(document.documentID) => \(document.data())") }
}
}
}
}
}
}
}
}
}
}
}
我有以下课程：
import Foundation
import FirebaseFirestore
class AssetsViewModel: ObservableObject {
@Published var assets = [Asset] ()
private var db = Firestore.firestore()
func fetchData() {
db.collection("assets").addSnapshotListener { (QuerySnapshot, error) in
guard let documents = QuerySnapshot?.documents else {
print("No assets in here")
return
}
self.assets = documents.map { (QueryDocumentSnapshot) -> Asset in
let data = QueryDocumentSnapshot.data()
let brand = data["brand"] as? String ?? ""
let description = data["description"] as? String ?? ""
let date = data["date"] as? String ?? ""
let cost = data["cost"] as? String ?? ""
let serial = data["serial"] as? String ?? ""
let warranty = data["warranty"] as? String ?? ""
let warranty_cost = data["warranty_cost"] as? String ?? ""
return Asset(brand: brand, description: description, date: date, cost: cost, serial: serial, warranty: warranty, warranty_cost: warranty_cost)
}
}
}
}
我有以下结构：
import Foundation
struct Asset: Identifiable {
var id: String = UUID().uuidString
var brand: String
var description: String
var date: String
var cost: String
var serial: String
var warranty: String
var warranty_cost: String
}
我的主要目标是像显示第一张图片一样显示信息。我将不胜感激。
这是我用来显示第一张图片的代码：
import SwiftUI
struct ContentView: View {
@ObservedObject private var viewModel = AssetsViewModel()
var body: some View {
NavigationView {
List(viewModel.assets) { asset in
VStack(alignment: .leading) {
Text(asset.brand)
.font(.headline)
Text(asset.description)
.font(.subheadline)
Text(asset.date)
.font(.subheadline)
Text(asset.cost)
.font(.subheadline)
Text(asset.serial)
.font(.subheadline)
Text(asset.warranty)
.font(.subheadline)
Text(asset.warranty_cost)
.font(.subheadline)
}
}
.navigationBarTitle("Assets")
.onAppear() {
self.viewModel.fetchData()
}
}
}
}
struct AssetViewSwiftUIView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
下面的帖子帮助了我。我得到的错误是因为Swift不喜欢我将ViewTable命名为“ assetList”。一旦我将名称更改为“ tableView”并在代码中进行了更改，它就会很好地工作。我添加了额外的代码来使单元格从此处自动调整：why UITableViewAutomaticDimension not working?。
非常感谢您的帮助！
答案 0 :(得分：1)
您需要这样的东西：
import Foundation
import UIKit
import FirebaseFirestore
class myTableCell: UITableViewCell {
@IBOutlet weak var brand: UILabel!
@IBOutlet weak var description: UILabel!
@IBOutlet weak var date: UILabel!
@IBOutlet weak var cost: UILabel!
@IBOutlet weak var serial: UILabel!
@IBOutlet weak var warranty: UILabel!
@IBOutlet weak var warrantyCost: UILabel!
}
class IndexAssets {
var brand = ""
var description = ""
var date = ""
var cost = ""
var serial = ""
var warranty = ""
var warrantyCost = ""
init(brand: String, description: String, date: String, cost: String, serial: String, warranty: String, warrantyCost: String)
{
self.brand = brand
self.description = description
self.date = date
self.cost = cost
self.serial = serial
self.warranty = warranty
self.warrantyCost = warrantyCost
}
}
class AssetViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var assetList: UITableView!
var dataArray: [IndexAssets] = [IndexAssets]()
override func viewDidLoad() {
super.viewDidLoad()
downloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dataArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! myTableCells
cell.brand?.text = dataArray[indexPath.row].brand
cell.description?.text = dataArray[indexPath.row].description
cell.date?.text = dataArray[indexPath.row].date
cell.cost?.text = dataArray[indexPath.row].cost
cell.serial?.text = dataArray[indexPath.row].serial
cell.warranty?.text = dataArray[indexPath.row].warranty
cell.warrantyCost?.text = dataArray[indexPath.row].warrantyCost
return cell
}
func downloadData()
{
let db = Firestore.firestore()
db.collection("assets").getDocuments { (snapshot, error) in
if error != nil
{
print("error")
}
else
{
for document in (snapshot?.documents)!
{
let brand = document.data() ["brand"] as? String
let description = document.data() ["description"] as? String
let date = document.data() ["date"] as? String
let cost = document.data() ["cost"] as? String
let serial = document.data() ["serial"] as? String
let warranty = document.data() ["warranty"] as? String
let warrantyCost = document.data() ["warranty_cost"] as? String
if let brand = brand, let description = description, let date = date, let cost = cost, let serial = serial, let warranty = warranty, let warrantyCost = warrantyCost
{
let insert = IndexAssets(brand: brand, description: description, date: date, cost: cost, serial: serial, warranty: warranty, warrantyCost: warrantyCost)
self.dataArray.append(insert)
}
}
self.assetList.reloadData()
}}
}
}
此外，请记住在情节提要中：