【发布时间】：2017-03-30 17:14:45
【问题描述】：
我正在尝试构建一个从 firebase-database 加载数据的应用程序。
将成员保存到 Firebase 没有任何问题。将成员从 Firebase 加载到我的 UITableView 正在工作，然后我对成员进行排序，并根据名字首字母（在 iOS 联系人应用程序中看到的 A、B、C 等）分别在部分标题下添加成员，这可以作为好吧，但是我的 问题 在我加载了所有用户之后发生，例如转到选项卡 1，然后切换回成员选项卡，所有显示的成员/单元格都是重复的。如果我重复相同的过程来回切换选项卡，所有单元格都会重复三次，然后继续。
我已经搜索了不同的来源以寻找解决方案，但我找不到任何类似的东西。
有谁知道解决方案或我做错了什么？
谢谢！
我的视图控制器：
import Foundation
import UIKit
class MembersTableViewController: UITableViewController {
var FBref = FIRDatabaseReference()
var members: [Member] = []
var membersDict = [String: [String]]()
var memberSectionTitles = [String]()
// TODO: Implement user.
//var user: AdminUser!
let fakeuservariable = "fakeuser"
@IBOutlet var memberListTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
loadDataFromFirebase()
createFirstnameDict()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return memberSectionTitles.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let firstLetterKey = memberSectionTitles[section]
if let firstnameValues = membersDict[firstLetterKey] {
return firstnameValues.count
}
return 0
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return memberSectionTitles[section]
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "membercell", for: indexPath)
let firstLetterKey = memberSectionTitles[indexPath.section]
if let firstnameValues = membersDict[firstLetterKey] {
cell.textLabel?.text = firstnameValues[indexPath.row]
// Not working
//let memberDetails = members[indexPath.row]
//cell.detailTextLabel!.text = "Amount left: \(memberDetails.memberamount)"
}
return cell
}
func createFirstnameDict() {
for firstname in members {
var firstLetter = firstname.firstname
let firstnameKey = firstLetter.substring(to: firstLetter.characters.index(firstLetter.startIndex, offsetBy: 1))
if var memberValues = membersDict[firstnameKey] {
memberValues.append(firstLetter)
membersDict[firstnameKey] = memberValues
} else {
membersDict[firstnameKey] = [firstLetter]
}
}
memberSectionTitles = [String](membersDict.keys)
memberSectionTitles = memberSectionTitles.sorted { $0 < $1 }
}
func loadDataFromFirebase() {
let FBref = FIRDatabase.database().reference()
FBref.child("member-list").observeSingleEvent(of: .value, with: { (snapshot) in
var resultItem: [Member] = []
for item in snapshot.children {
let memberItem = Member(snapshot: item as! FIRDataSnapshot)
resultItem.append(memberItem)
}
self.members = resultItem
self.createFirstnameDict()
self.tableView.reloadData()
}) { (error) in
print(error.localizedDescription)
}
}
}
我的会员模型：
import Foundation
struct Member {
let firstname: String
let lastname: String
let email: String
let phonenumber: String
let socialsecuritynr: String
let memberamount: String
let addedByUser: String
let key: String
let ref: FIRDatabaseReference?
init(firstname: String, lastname: String, email: String, phonenumber: String, socialsecuritynr: String, memberamount: String, addedByUser: String, key: String = "") {
self.key = key
self.firstname = firstname
self.lastname = lastname
self.email = email
self.phonenumber = phonenumber
self.socialsecuritynr = socialsecuritynr
self.memberamount = memberamount
self.addedByUser = addedByUser
self.ref = nil
}
init(snapshot: FIRDataSnapshot) {
key = snapshot.key
let snapshotValue = snapshot.value as! [String: AnyObject]
firstname = snapshotValue["firstname"] as! String
lastname = snapshotValue["lastname"] as! String
email = snapshotValue["email"] as! String
phonenumber = snapshotValue["phonenumber"] as! String
socialsecuritynr = snapshotValue["socialsecuritynr"] as! String
memberamount = snapshotValue["memberamount"] as! String
addedByUser = snapshotValue["addedByUser"] as! String
ref = snapshot.ref
}
func toAnyObject() -> Any {
return ["firstname": firstname, "lastname": lastname, "email": email, "phonenumber": phonenumber, "socialsecuritynr": socialsecuritynr, "memberamount":memberamount, "addedByUser": addedByUser]
}
}
这是我之前和之后的 TableView：
【问题讨论】：
-
您是否删除或分离了 EventListner？如果没有，请将其删除以不获取重复项
-
@Muhammad Farrukh Faizy 我不确定你的意思是什么？
标签： ios swift uitableview firebase firebase-realtime-database