Cell of UITableView is not displayed at all - swift

Question

No cell of UITableView is displayed.
Probably the cause seems to be part of the setting of delegate and dataSource of UITableView, but I do not know the specific point.
So paste all the code.
If you do not understand the intention of the question, please do not hesitate to tell me.
I will tell you sincerity sincerity.
import UIKit
import Firebase
import FirebaseStorage
import FirebaseFirestore
import SDWebImage
struct CellData {
var date: Date
var time: String
var title: String
var name: String
var image: URL
}
struct TableSection<SectionItem: Comparable&Hashable, RowItem>: Comparable {
var sectionItem: SectionItem
var rowItems: [RowItem]
static func < (lhs: TableSection, rhs: TableSection) -> Bool {
return lhs.sectionItem > rhs.sectionItem
}
static func == (lhs: TableSection, rhs: TableSection) -> Bool {
return lhs.sectionItem == rhs.sectionItem
}
static func group(rowItems : [RowItem], by criteria : (RowItem) -> SectionItem ) -> [TableSection<SectionItem, RowItem>] {
let groups = Dictionary(grouping: rowItems, by: criteria)
return groups.map(TableSection.init(sectionItem:rowItems:)).sorted()
}
}
fileprivate func parseDate(_ str: String) -> Date {
let dateFormat = DateFormatter()
dateFormat.dateFormat = "yyyy年MM月dd日"
return dateFormat.date(from: str)!
}
fileprivate func firstDayOfMonth(date: Date) -> Date {
let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day], from: date)
return calendar.date(from: components)!
}
class timelineViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{
var arr = [CellData]()
let db = Firestore.firestore()
var sections = [TableSection<Date, CellData>]()
var teamIDFromFirebase: String = ""
var fireAuthUID = (Auth.auth().currentUser?.uid ?? "no data")
var dataImageFromFirestore = [Any]()
var dataTitleFromFireStore = [Any]()
var dataTimeFromFirestore = [Any]()
var dataNameFromFireStore = [Any]()
var dataDateFromFiewstore = [Any]()
var timelineDocumentIdArr = [Any]()
var draftDocumentIdArr = [Any]()
var submitDocumentIdArr = [Any]()
var selectedNum = 0
#IBOutlet weak var circleButton: UIButton!
#IBOutlet weak var userTable: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
circleButton = Circle()
if arr != nil {
self.arr = []
self.dataNameFromFireStore = [Any]()
self.dataTimeFromFirestore = [Any]()
self.dataTitleFromFireStore = [Any]()
self.dataImageFromFirestore = [Any]()
self.submitDocumentIdArr = [Any]()
self.selectedNum = 1
userTable.delegate = self
userTable.dataSource = self
userTable.register(UINib(nibName: "userTableViewCell", bundle: nil), forCellReuseIdentifier: "cellName")
self.db.collection("users").document(self.fireAuthUID).addSnapshotListener { (snapshot3, error) in
guard let document3 = snapshot3 else {
print("erorr2 \(String(describing: error))")
return
}
guard let data = document3.data() else { return }
self.teamIDFromFirebase = data["teamID"] as? String ?? ""
self.db.collection("diary").document(self.teamIDFromFirebase).collection("diaries").whereField("submit", isEqualTo: true).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
return self.arr = [CellData(date: parseDate(""), time: "", title: "", name: "", image:URL(string: "")!)]
} else {
var i = 0
for document in querySnapshot!.documents {
self.timelineDocumentIdArr.append(document.documentID)
guard let documentData: [String: Any] = document.data() else { return }
self.dataTitleFromFireStore.append((documentData["今日のタイトル"] as? String)!)
self.dataTimeFromFirestore.append((documentData["time"] as? String)!)
self.dataNameFromFireStore.append((documentData["userName"] as? String)!)
self.dataImageFromFirestore.append((documentData["image"] as? String)!)
self.dataDateFromFiewstore.append((documentData["date"] as? String)!)
self.arr.append(CellData(date: parseDate(self.dataDateFromFiewstore[i] as! String), time: self.dataTimeFromFirestore[i] as? String ?? "", title: self.dataTitleFromFireStore[i] as? String ?? "", name: self.dataNameFromFireStore[i] as? String ?? "", image: URL(string: self.dataImageFromFirestore[i] as! String)!))
i += 1
}
self.userTable.reloadData()
}
}
}
}
self.sections = TableSection.group(rowItems: self.arr, by: { (headline) in
firstDayOfMonth(date: headline.date)
})
}
func numberOfSections(in tableView: UITableView) -> Int {
return self.sections.count
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let section = self.sections[section]
let date = section.sectionItem
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy年MM月dd日"
return dateFormatter.string(from: date)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let section = self.sections[section]
return section.rowItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = userTable.dequeueReusableCell(withIdentifier: "cellName", for: indexPath) as! userTableViewCell
let section = self.sections[indexPath.section]
let cellDetail = section.rowItems[indexPath.row]
cell.userTitle.text = cellDetail.title
cell.userName.text = cellDetail.name
cell.userTime.text = cellDetail.time
cell.userImage.sd_setImage(with: cellDetail.image)
return cell
}
}

Answer 1

You should assign the sections property inside the closure. This is corrected the viewDidLoad method:
override func viewDidLoad() {
super.viewDidLoad()
circleButton = Circle()
if arr != nil {
self.arr = []
self.dataNameFromFireStore = [Any]()
self.dataTimeFromFirestore = [Any]()
self.dataTitleFromFireStore = [Any]()
self.dataImageFromFirestore = [Any]()
self.submitDocumentIdArr = [Any]()
self.selectedNum = 1
userTable.delegate = self
userTable.dataSource = self
userTable.register(UINib(nibName: "userTableViewCell", bundle: nil), forCellReuseIdentifier: "cellName")
self.db.collection("users").document(self.fireAuthUID).addSnapshotListener { (snapshot3, error) in
guard let document3 = snapshot3 else {
print("erorr2 \(String(describing: error))")
return
}
guard let data = document3.data() else { return }
self.teamIDFromFirebase = data["teamID"] as? String ?? ""
self.db.collection("diary").document(self.teamIDFromFirebase).collection("diaries").whereField("submit", isEqualTo: true).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
return self.arr = [CellData(date: parseDate(""), time: "", title: "", name: "", image:URL(string: "")!)]
} else {
var i = 0
for document in querySnapshot!.documents {
self.timelineDocumentIdArr.append(document.documentID)
guard let documentData: [String: Any] = document.data() else { return }
self.dataTitleFromFireStore.append((documentData["今日のタイトル"] as? String)!)
self.dataTimeFromFirestore.append((documentData["time"] as? String)!)
self.dataNameFromFireStore.append((documentData["userName"] as? String)!)
self.dataImageFromFirestore.append((documentData["image"] as? String)!)
self.dataDateFromFiewstore.append((documentData["date"] as? String)!)
self.arr.append(CellData(date: parseDate(self.dataDateFromFiewstore[i] as! String), time: self.dataTimeFromFirestore[i] as? String ?? "", title: self.dataTitleFromFireStore[i] as? String ?? "", name: self.dataNameFromFireStore[i] as? String ?? "", image: URL(string: self.dataImageFromFirestore[i] as! String)!))
i += 1
}
self.sections = TableSection.group(rowItems: self.arr, by: { (headline) in
firstDayOfMonth(date: headline.date)
})
self.userTable.reloadData()
}
}
}
}
}