搜索后索引路径行为零
Indexpath row is zero after searching
我在搜索 tableview 后遇到了问题。存储在 Firebase 中的 PDF 文件在表视图中按字母顺序列出，可以在详细视图中单独打开，在搜索项目后，也可以毫无问题地查看过滤后的项目。但是，在返回列表并单击相同的过滤后的 pdf 而不刷新列表后，它给了我列表的第一个 pdf，即 indexpath.row 为零。
例如，当我搜索并单击 indexpath.row 编号为 3 的项目时，我会找到相关的 pdf 文件。但是当我返回并单击同一个筛选项时，它会显示整个列表的第一项。无法弄清楚如何处理它。谢谢。
import UIKit
import Firebase
import PDFKit
class IcsViewcontroller: UIViewController , UISearchBarDelegate {
var preImage : UIImage?
let cellSpacingHeight: CGFloat = 20
@IBOutlet weak var searchBar: UISearchBar!
@IBOutlet weak var pdfListView: UITableView!
@IBOutlet weak var spinner: UIActivityIndicatorView!
var pdfList = [pdfClass]()
var searchall = [pdfClass]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
pdfListView.delegate = self
pdfListView.dataSource = self
searchBar.delegate = self
self.pdfListView.isHidden = true
getPdf()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if searching {
let destination = segue.destination as! PdfKitViewController
let selectedIndexPath = pdfListView.indexPathForSelectedRow
destination.pdf = searchall[selectedIndexPath!.row]
} else {
let destination = segue.destination as! PdfKitViewController
let selectedIndexPath = pdfListView.indexPathForSelectedRow
destination.pdf = pdfList [selectedIndexPath!.row]
}
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
if searchBar.text == nil || searchBar.text == "" {
searching = false
} else {
searching = true
}
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
searching = false
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searching = false
searchBar.text = ""
self.pdfListView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searching = false
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if searchBar.text == nil || searchBar.text == "" {
searchall = pdfList
searching = false
pdfListView.reloadData()
} else {
searching = true
searchall = pdfList.filter({([=10=].pdf_name?.lowercased().prefix(searchText.count))! == searchText.lowercased() })
pdfListView.reloadData()
}
}
func getPdf () {
spinner.startAnimating()
let docRef = Storage.storage().reference().child("ICS_Documents")
docRef.listAll{ (result , error ) in
if let error = error {
print (error )
}
for item in result.items {
let storeageLocation = String( describing : item)
let gsReference = Storage.storage().reference(forURL: storeageLocation)
gsReference.downloadURL{ url , error in
//self.pdfList.removeAll()
if let error = error{
print(error)
} else {
let pdf_name = String( item.name)
let pdf_url = url?.absoluteString
let thumbnailSize = CGSize(width: 100, height: 100)
let thmbnail = self.generatePdfThumbnail(of: thumbnailSize, for: url!, atPage: 0)
let pdfall = pdfClass(pdf_name: pdf_name, pdf_url: pdf_url!, pdf_preview: thmbnail!)
self.pdfList.append(pdfall)
}
DispatchQueue.main.async {
self.pdfList = self.pdfList.sorted(by: { [=10=].pdf_name ?? "" < .pdf_name ?? ""})
self.pdfListView.reloadData()
self.spinner.stopAnimating()
self.pdfListView.isHidden = false
}
}
}
}
}
func generatePdfThumbnail(of thumbnailSize: CGSize , for documentUrl: URL, atPage pageIndex: Int) -> UIImage? {
let pdfDocument = PDFDocument(url: documentUrl)
let pdfDocumentPage = pdfDocument?.page(at: pageIndex)
return pdfDocumentPage?.thumbnail(of: thumbnailSize, for: PDFDisplayBox.trimBox)
}
}
extension IcsViewcontroller : UITableViewDelegate,UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching{
return searchall.count
}else {
return pdfList.count
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return cellSpacingHeight
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "pdfCell", for: indexPath) as! pdfCellTableViewCell
let varcell : pdfClass
if searching {
varcell = searchall [indexPath.row]
} else {
varcell = pdfList [indexPath.row]
}
cell.configure(name: varcell.pdf_name! , pdfthumbnail: varcell.pdf_preview!)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var indx : pdfClass
if searching{
indx = searchall[indexPath.row ]
print(indexPath.row )
}else {
indx = pdfList[indexPath.row]
}
performSegue(withIdentifier: "toPdfKit", sender: indx)
print(indexPath.row)
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let deleteAction = UITableViewRowAction(style: .default, title: "Delete", handler: { (action:UITableViewRowAction,indexPath:IndexPath)-> Void in
let storage = Storage.storage()
let childsRURL = self.pdfList[indexPath.row].pdf_url
let storageref = storage.reference(forURL: childsRURL!)
storageref.delete{ error in
if let error = error {
print(error.localizedDescription)
} else{
print("File deleted")
}
}
self.pdfListView.reloadData()
})
return [deleteAction]
}
}
这是 pdfClass
import Foundation
import UIKit
class pdfClass : NSObject {
var pdf_name : String?
var pdf_url : String?
var pdf_preview : UIImage?
override init(){
}
init (pdf_name :String , pdf_url : String, pdf_preview : UIImage ) {
self.pdf_name = pdf_name
self.pdf_url = pdf_url
self.pdf_preview = pdf_preview
}
}
我相信您的问题出在这里，当您单击该单元格时，您的 searchBar 编辑已完成，您将变量设置为 false，更改了您在委托中处理的列表。
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
searching = false
}
为简单起见，我建议保留原始列表只是为了将结果加载到整个 class 中使用的辅助列表中，而不是在每个委托中使用两个列表。
像这样：
import UIKit
class Shops {
private var _familiy_id: String?
private var _logo : String?
private var _shopname : String?
var familiy_id : String{
return _familiy_id!
}
var shopname : String{
return _shopname!
}
var Logo : String{
return _logo!
}
init(shopname : String , Logo : String , family_id : String) {
self._shopname = shopname
self._logo = Logo
self._familiy_id = family_id
}
}
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var shops : [Shops]! = []
var auxiliar : [Shops]!
override func viewDidLoad() {
super.viewDidLoad()
// 1 - load data to shops array
shops.append(Shops(shopname: "Brasil", Logo: "BR", family_id: "1"))
shops.append(Shops(shopname: "Brasolia", Logo: "BA", family_id: "2"))
shops.append(Shops(shopname: "Colombia", Logo: "CO", family_id: "3"))
shops.append(Shops(shopname: "Argentina", Logo: "AR", family_id: "4"))
// 2 - auxiliar receive the complete original array
auxiliar = shops
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return auxiliar.count;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")!
cell.textLabel?.text = auxiliar[indexPath.row].shopname
return cell
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
auxiliar = shops.filter { [=11=].shopname.range(of: searchText, options: .caseInsensitive, range: nil, locale: nil) != nil }
if searchText == "" {
// 3 if there is nothing to search, auxiliar receive the complete orihinal array
auxiliar = shops
}
tableView.reloadData()
}
}
我在搜索 tableview 后遇到了问题。存储在 Firebase 中的 PDF 文件在表视图中按字母顺序列出，可以在详细视图中单独打开，在搜索项目后，也可以毫无问题地查看过滤后的项目。但是，在返回列表并单击相同的过滤后的 pdf 而不刷新列表后，它给了我列表的第一个 pdf，即 indexpath.row 为零。
例如，当我搜索并单击 indexpath.row 编号为 3 的项目时，我会找到相关的 pdf 文件。但是当我返回并单击同一个筛选项时，它会显示整个列表的第一项。无法弄清楚如何处理它。谢谢。
import UIKit
import Firebase
import PDFKit
class IcsViewcontroller: UIViewController , UISearchBarDelegate {
var preImage : UIImage?
let cellSpacingHeight: CGFloat = 20
@IBOutlet weak var searchBar: UISearchBar!
@IBOutlet weak var pdfListView: UITableView!
@IBOutlet weak var spinner: UIActivityIndicatorView!
var pdfList = [pdfClass]()
var searchall = [pdfClass]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
pdfListView.delegate = self
pdfListView.dataSource = self
searchBar.delegate = self
self.pdfListView.isHidden = true
getPdf()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if searching {
let destination = segue.destination as! PdfKitViewController
let selectedIndexPath = pdfListView.indexPathForSelectedRow
destination.pdf = searchall[selectedIndexPath!.row]
} else {
let destination = segue.destination as! PdfKitViewController
let selectedIndexPath = pdfListView.indexPathForSelectedRow
destination.pdf = pdfList [selectedIndexPath!.row]
}
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
if searchBar.text == nil || searchBar.text == "" {
searching = false
} else {
searching = true
}
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
searching = false
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searching = false
searchBar.text = ""
self.pdfListView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searching = false
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if searchBar.text == nil || searchBar.text == "" {
searchall = pdfList
searching = false
pdfListView.reloadData()
} else {
searching = true
searchall = pdfList.filter({([=10=].pdf_name?.lowercased().prefix(searchText.count))! == searchText.lowercased() })
pdfListView.reloadData()
}
}
func getPdf () {
spinner.startAnimating()
let docRef = Storage.storage().reference().child("ICS_Documents")
docRef.listAll{ (result , error ) in
if let error = error {
print (error )
}
for item in result.items {
let storeageLocation = String( describing : item)
let gsReference = Storage.storage().reference(forURL: storeageLocation)
gsReference.downloadURL{ url , error in
//self.pdfList.removeAll()
if let error = error{
print(error)
} else {
let pdf_name = String( item.name)
let pdf_url = url?.absoluteString
let thumbnailSize = CGSize(width: 100, height: 100)
let thmbnail = self.generatePdfThumbnail(of: thumbnailSize, for: url!, atPage: 0)
let pdfall = pdfClass(pdf_name: pdf_name, pdf_url: pdf_url!, pdf_preview: thmbnail!)
self.pdfList.append(pdfall)
}
DispatchQueue.main.async {
self.pdfList = self.pdfList.sorted(by: { [=10=].pdf_name ?? "" < .pdf_name ?? ""})
self.pdfListView.reloadData()
self.spinner.stopAnimating()
self.pdfListView.isHidden = false
}
}
}
}
}
func generatePdfThumbnail(of thumbnailSize: CGSize , for documentUrl: URL, atPage pageIndex: Int) -> UIImage? {
let pdfDocument = PDFDocument(url: documentUrl)
let pdfDocumentPage = pdfDocument?.page(at: pageIndex)
return pdfDocumentPage?.thumbnail(of: thumbnailSize, for: PDFDisplayBox.trimBox)
}
}
extension IcsViewcontroller : UITableViewDelegate,UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching{
return searchall.count
}else {
return pdfList.count
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return cellSpacingHeight
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "pdfCell", for: indexPath) as! pdfCellTableViewCell
let varcell : pdfClass
if searching {
varcell = searchall [indexPath.row]
} else {
varcell = pdfList [indexPath.row]
}
cell.configure(name: varcell.pdf_name! , pdfthumbnail: varcell.pdf_preview!)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var indx : pdfClass
if searching{
indx = searchall[indexPath.row ]
print(indexPath.row )
}else {
indx = pdfList[indexPath.row]
}
performSegue(withIdentifier: "toPdfKit", sender: indx)
print(indexPath.row)
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let deleteAction = UITableViewRowAction(style: .default, title: "Delete", handler: { (action:UITableViewRowAction,indexPath:IndexPath)-> Void in
let storage = Storage.storage()
let childsRURL = self.pdfList[indexPath.row].pdf_url
let storageref = storage.reference(forURL: childsRURL!)
storageref.delete{ error in
if let error = error {
print(error.localizedDescription)
} else{
print("File deleted")
}
}
self.pdfListView.reloadData()
})
return [deleteAction]
}
}
这是 pdfClass
import Foundation
import UIKit
class pdfClass : NSObject {
var pdf_name : String?
var pdf_url : String?
var pdf_preview : UIImage?
override init(){
}
init (pdf_name :String , pdf_url : String, pdf_preview : UIImage ) {
self.pdf_name = pdf_name
self.pdf_url = pdf_url
self.pdf_preview = pdf_preview
}
}
我相信您的问题出在这里，当您单击该单元格时，您的 searchBar 编辑已完成，您将变量设置为 false，更改了您在委托中处理的列表。
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
searching = false
}
为简单起见，我建议保留原始列表只是为了将结果加载到整个 class 中使用的辅助列表中，而不是在每个委托中使用两个列表。
像这样：
import UIKit
class Shops {
private var _familiy_id: String?
private var _logo : String?
private var _shopname : String?
var familiy_id : String{
return _familiy_id!
}
var shopname : String{
return _shopname!
}
var Logo : String{
return _logo!
}
init(shopname : String , Logo : String , family_id : String) {
self._shopname = shopname
self._logo = Logo
self._familiy_id = family_id
}
}
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var shops : [Shops]! = []
var auxiliar : [Shops]!
override func viewDidLoad() {
super.viewDidLoad()
// 1 - load data to shops array
shops.append(Shops(shopname: "Brasil", Logo: "BR", family_id: "1"))
shops.append(Shops(shopname: "Brasolia", Logo: "BA", family_id: "2"))
shops.append(Shops(shopname: "Colombia", Logo: "CO", family_id: "3"))
shops.append(Shops(shopname: "Argentina", Logo: "AR", family_id: "4"))
// 2 - auxiliar receive the complete original array
auxiliar = shops
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return auxiliar.count;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")!
cell.textLabel?.text = auxiliar[indexPath.row].shopname
return cell
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
auxiliar = shops.filter { [=11=].shopname.range(of: searchText, options: .caseInsensitive, range: nil, locale: nil) != nil }
if searchText == "" {
// 3 if there is nothing to search, auxiliar receive the complete orihinal array
auxiliar = shops
}
tableView.reloadData()
}
}