Swift - 使用节和源更新/添加/删除表视图上的项
如何使用部分及其来源更新/添加/删除表格视图中的项目？
尝试更新单元格时遇到问题。有时它会发生在删除和添加上。
似乎部分上的问题正在触发它。
1-数据从服务器的JSON响应加载。
2 - 此数据按字母顺序排序，并创建基于名称中第一个字母的部分，将每个客户端添加到其索引字母。
我正在添加到打印屏幕：
在：
后：
我改名为'碗＆＃39;到碗2＆＃39;它创造了＆＃39;一个新的条目，保持旧的和新的价值。如果我刷新（拉），它就会被修复。
此外，有时，它会删除Abc MacDon＆＃39;刷新后，它会得到修复。
class ClientsViewController: UITableViewController {
var sortedFirstLetters: [String] = []
var sections: [[Client]] = [[]]
var tableArray = [Client]()
var client: Client?
var wasDeleted: Bool?
var refresher: UIRefreshControl!
@IBOutlet weak var noClientsLabel: UILabel!
@IBOutlet var noClientsView: UIView!
@IBAction func unwindToClients(sender: UIStoryboardSegue) {
if let sourceViewController = sender.source as? ClientViewController,
let client = sourceViewController.client,
let wasDeleted = sourceViewController.wasDeleted {
if(wasDeleted) {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
print("Delteted")
tableArray.remove(at: selectedIndexPath.row)
// DispatchQueue.main.async {
// // Deleting the row in the tableView
// if self.tableView.numberOfRows(inSection: selectedIndexPath.section) > 1 {
// self.tableView.deleteRows(at: [selectedIndexPath], with: UITableViewRowAnimation.bottom)
// } else {
// let indexSet = NSMutableIndexSet()
// indexSet.add(selectedIndexPath.section)
// self.tableView.deleteSections(indexSet as IndexSet, with: UITableViewRowAnimation.bottom)
// }
//
// }
}
}
else {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing client.
tableArray[selectedIndexPath.row] = client
//tableView.reloadRows(at: [selectedIndexPath], with: .automatic)
print("update")
print(tableArray)
}
else {
// Add a client.
tableArray.append(client)
print("add")
}
}
self.prepareData()
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let secondScene = segue.destination as! ClientViewController
if segue.identifier == "ShowDetail", let indexPath = self.tableView.indexPathForSelectedRow {
let currentPhoto = sections[indexPath.section][indexPath.row]
secondScene.client = currentPhoto
}
else if segue.identifier == "AddItem" {
print("add")
}
else {
fatalError("The selected cell is not being displayed by the table")
}
}
@objc func handleRefresh(_ refreshControl: UIRefreshControl) {
getClients()
}
}
extension ClientsViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.refreshControl?.addTarget(self, action: #selector(ClientsViewController.handleRefresh(_:)), for: UIControlEvents.valueChanged)
tableView.backgroundView = nil
noClientsLabel.text = ""
getClients() //for only the 1st time ==> when view is created ==> ok ish
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if(self.tableArray.count > 0) {
return sortedFirstLetters[section]
}
else {
return ""
}
}
override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return sortedFirstLetters
}
override func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let item = sections[indexPath.section][indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "ClientCell", for: indexPath)
cell.textLabel?.text = item.name
cell.detailTextLabel?.text = item.city + " - " + item.province
return cell
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].count
}
func getClients() {
print("called server")
self.refreshControl?.beginRefreshing()
self.tableView.setContentOffset(CGPoint(x:0, y:-100), animated: true)
makeRequest(endpoint: "api/clients/all",
parameters: [:],
completionHandler: { (container : ApiContainer<Client>?, error : Error?) in
if let error = error {
print("error calling POST on /getClients")
print(error)
return
}
self.tableArray = (container?.result)!
self.prepareData()
DispatchQueue.main.async {
if(self.tableArray.isEmpty)
{
self.noClientsLabel.text = "bNo Clients"
self.tableView.backgroundView?.isHidden = false
self.noClientsLabel.text = ""
print("all")
}
else{
print("nothing")
}
self.tableView.reloadData()
self.refreshControl?.endRefreshing()
}
} )
}
//sorts and makes the index
func prepareData() {
let firstLetters = self.tableArray.map { $0.nameFirstLetter }
let uniqueFirstLetters = Array(Set(firstLetters))
self.sortedFirstLetters = uniqueFirstLetters.sorted()
self.sections = self.sortedFirstLetters.map { firstLetter in
return self.tableArray
.filter { $0.nameFirstLetter == firstLetter }
.sorted { $0.name < $1.name }
}
}
}
STRUCT
struct Client: Codable {
var client_id: Int!
let name: String!
let postal_code: String!
let province: String!
let city: String!
let address: String!
init(name: String, client_id: Int! = nil, postal_code: String, province: String, city: String, address: String) {
self.client_id = client_id
self.name = name
self.postal_code = postal_code
self.province = province
self.city = city
self.address = address
}
var nameFirstLetter: String {
return String(self.name[self.name.startIndex]).uppercased()
}
}
代码
import UIKit
import Foundation
class ClientsViewController: UITableViewController {
var sortedFirstLetters: [String] = []
var sections: [[Client]] = [[]]
// var tableArray = [Client]()
var tableArray : [Client] = [Client]()
var client: Client?
var wasDeleted: Bool?
var refresher: UIRefreshControl!
@IBOutlet weak var noClientsLabel: UILabel!
@IBOutlet var noClientsView: UIView!
@IBAction func unwindToClients(sender: UIStoryboardSegue) {
if let sourceViewController = sender.source as? ClientViewController,
let client = sourceViewController.client,
let wasDeleted = sourceViewController.wasDeleted {
if(wasDeleted) {
if let index = self.tableArray.index(where: { (item) -> Bool in
item.client_id == client.client_id
}) {
self.tableArray.remove(at: index)
print("Delteted")
// Find the client in the tableArray by the client id and remove it from the tableArray
// I am writing an example code here, this is not tested so just get the logic from here.
//self.tableArray.remove(at: selectedIndexPath.row)
}
}
else {
if self.tableArray.contains(where: { (item) -> Bool in
item.client_id == client.client_id
}) {
//Find the item in the tableArray by the client id and update it there too
// I am writing an example code here, this is not tested so just get the logic from here.
//if let index = self.tableArray.index(where: { (item) -> Bool in
// item.id == client.id
//}) {
self.tableArray[index] = client
//self.tableArray.replace(client, at: index)
//}
print("update")
print(tableArray)
}
else {
// Add a client.
tableArray.append(client)
print("add")
}
}
// Now update the sections Array and it will have all the correct values
self.prepareData()
DispatchQueue.main.async {
self.tableView.reloadData()
}
// if(wasDeleted) {
// if let selectedIndexPath = tableView.indexPathForSelectedRow {
// print("Delteted")
// sections[selectedIndexPath.section].remove(at: selectedIndexPath.row)
// }
//
// }
// else {
// if let selectedIndexPath = tableView.indexPathForSelectedRow {
// // Update an existing client.
// sections[selectedIndexPath.section][selectedIndexPath.row] = client
// //tableView.reloadRows(at: [selectedIndexPath], with: .automatic)
// print("update")
// print(tableArray)
// }
// else {
// // Add a client.
// tableArray.append(client)
// print("add")
// self.prepareData()
// }
// }
//
// DispatchQueue.main.async {
//
// self.tableView.reloadData()
// }
// if(wasDeleted) {
// if let selectedIndexPath = tableView.indexPathForSelectedRow {
// print("Delteted")
// tableArray.remove(at: selectedIndexPath.row)
//// DispatchQueue.main.async {
//// // Deleting the row in the tableView
//// if self.tableView.numberOfRows(inSection: selectedIndexPath.section) > 1 {
//// self.tableView.deleteRows(at: [selectedIndexPath], with: UITableViewRowAnimation.bottom)
//// } else {
//// let indexSet = NSMutableIndexSet()
//// indexSet.add(selectedIndexPath.section)
//// self.tableView.deleteSections(indexSet as IndexSet, with: UITableViewRowAnimation.bottom)
//// }
////
//// }
// }
//
// }
// else {
// if let selectedIndexPath = tableView.indexPathForSelectedRow {
// // Update an existing client.
// tableArray[selectedIndexPath.row] = client
// //tableView.reloadRows(at: [selectedIndexPath], with: .automatic)
// print("update")
// print(tableArray)
// }
// else {
// // Add a client.
// tableArray.append(client)
// print("add")
// }
// }
// self.prepareData()
// DispatchQueue.main.async {
//
// self.tableView.reloadData()
// }
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let secondScene = segue.destination as! ClientViewController
if segue.identifier == "ShowDetail", let indexPath = self.tableView.indexPathForSelectedRow {
let currentPhoto = sections[indexPath.section][indexPath.row]
secondScene.client = currentPhoto
}
else if segue.identifier == "AddItem" {
print("add")
}
else {
fatalError("The selected cell is not being displayed by the table")
}
}
@objc func handleRefresh(_ refreshControl: UIRefreshControl) {
getClients()
}
}
extension ClientsViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.refreshControl?.addTarget(self, action: #selector(ClientsViewController.handleRefresh(_:)), for: UIControlEvents.valueChanged)
tableView.backgroundView = nil
noClientsLabel.text = ""
getClients() //for only the 1st time ==> when view is created ==> ok ish
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if(self.tableArray.count > 0) {
return sortedFirstLetters[section]
}
else {
return ""
}
}
override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return sortedFirstLetters
}
override func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let item = sections[indexPath.section][indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "ClientCell", for: indexPath)
cell.textLabel?.text = item.name
cell.detailTextLabel?.text = item.city + " - " + item.province
return cell
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].count
}
func getClients() {
print("called server")
self.refreshControl?.beginRefreshing()
self.tableView.setContentOffset(CGPoint(x:0, y:-100), animated: true)
makeRequest(endpoint: "api/clients/all",
parameters: [:],
completionHandler: { (container : ApiContainer<Client>?, error : Error?) in
if let error = error {
print("error calling POST on /getClients")
print(error)
return
}
self.tableArray = (container?.result)!
self.prepareData()
DispatchQueue.main.async {
if(self.tableArray.isEmpty)
{
self.noClientsLabel.text = "bNo Clients"
self.tableView.backgroundView?.isHidden = false
self.noClientsLabel.text = ""
print("all")
}
else{
print("nothing")
}
self.tableView.reloadData()
self.refreshControl?.endRefreshing()
}
} )
}
//sorts and makes the index
func prepareData() {
let firstLetters = self.tableArray.map { $0.nameFirstLetter }
let uniqueFirstLetters = Array(Set(firstLetters))
self.sortedFirstLetters = uniqueFirstLetters.sorted()
self.sections = self.sortedFirstLetters.map { firstLetter in
return self.tableArray
.filter { $0.nameFirstLetter == firstLetter }
.sorted { $0.name < $1.name }
}
}
}
1 个答案:
答案 0 :(得分：1)
您正在编辑错误的数据源。您应该编辑或更新sections数组而不是tableArray。
在unwindToClients更改您的代码：
if(wasDeleted) {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
print("Delteted")
tableArray.remove(at: selectedIndexPath.row)
}
}
else {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing client.
tableArray[selectedIndexPath.row] = client
//tableView.reloadRows(at: [selectedIndexPath], with: .automatic)
print("update")
print(tableArray)
}
else {
// Add a client.
tableArray.append(client)
print("add")
}
}
self.prepareData()
DispatchQueue.main.async {
self.tableView.reloadData()
}
用这个：
if(wasDeleted) {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
print("Delteted")
sections[selectedIndexPath.section].remove(at: selectedIndexPath.row)
}
}
else {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing client.
sections[selectedIndexPath.section][selectedIndexPath.row] = client
//tableView.reloadRows(at: [selectedIndexPath], with: .automatic)
print("update")
print(tableArray)
}
else {
// Add a client.
tableArray.append(client)
print("add")
self.prepareData()
}
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
要修复错误的部分标题，请尝试执行以下操作：
if(wasDeleted) {
if let index = self.tableArray.index(where: { (item) -> Bool in
item.id == client.id
}) {
print("Delteted")
// Find the client in the tableArray by the client id and remove it from the tableArray
// I am writing an example code here, this is not tested so just get the logic from here.
//self.tableArray.remove(at: index)
}
}
else {
if self.tableArray.contains(client) {
//Find the item in the tableArray by the client id and update it there too
// I am writing an example code here, this is not tested so just get the logic from here.
//if let index = self.tableArray.index(where: { (item) -> Bool in
// item.id == client.id
//}) {
// self.tableArray.replace(client, at: index)
//}
print("update")
print(tableArray)
}
else {
// Add a client.
tableArray.append(client)
print("add")
}
}
// Now update the sections Array and it will have all the correct values
self.prepareData()
DispatchQueue.main.async {
self.tableView.reloadData()
}
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