在 CollectionViewCell 中重新加载 TableViewCell
Reloading TableViewCell inside CollectionViewCell
我尝试了 viewWillAppear、tableView.reloadData() 和 collectionView.reloadData()，但数据数组似乎从未出现
import UIKit
class yearOne: UICollectionViewController, coursesDelegate {
let customCellIdentifier = "cellID"
let customCellIdentifier2 = "cellID2"
let customCellIdentifier3 = "cellID3"
let customCellIdentifier4 = "cellID4"
let quarters = [
customLabel (title: "Fall Quarter"),
customLabel (title: "Winter Quarter"),
customLabel (title: "Spring Quarter"),
customLabel (title: "Summer Quarter")
]
func sendDataBackFall(data: String) {
fallQuarterCell.data.append(data)
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackWinter(data2: String) {
winterQuarterCell.data.append(data2)
//UserDefaults.standard.set(winterQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackSpring(data3: String) {
springQuarterCell.data.append(data3)
//UserDefaults.standard.set(springQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackSummer(data4: String) {
summerQuarterCell.data.append(data4)
//UserDefaults.standard.set(summerQuarterCell.data, forKey: "SavedArray")
}
let vc = fallQuarterCell()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("1")
print(fallQuarterCell.data)
vc.tableView.reloadData()
collectionView.reloadData()
print("2")
print(fallQuarterCell.data)
}
override func viewDidLoad() {
super.viewDidLoad()
collectionView.dataSource = self
collectionView.delegate = self
self.collectionView!.register(fallQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier)
self.collectionView!.register(winterQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier2)
self.collectionView!.register(springQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier3)
self.collectionView!.register(summerQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier4)
navigationItem.title = "Year One"
navigationController?.navigationBar.prefersLargeTitles = true
collectionView?.backgroundColor = .lightGray
//navigationItem.prompt = "Click the + button to add courses, Swipe left on a course to delete."
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return quarters.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if (indexPath.row == 0){
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier, for: indexPath) as! fallQuarterCell
cell1.layer.borderColor = UIColor.orange.cgColor
cell1.layer.borderWidth = 2
cell1.layer.cornerRadius = 5
cell1.quarters = self.quarters[0]
return cell1
}
else if (indexPath.row == 1){
let cell2 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier2, for: indexPath) as! winterQuarterCell
cell2.layer.borderColor = UIColor.blue.cgColor
cell2.layer.borderWidth = 2
cell2.layer.cornerRadius = 5
cell2.quarters = self.quarters[1]
return cell2
}
else if (indexPath.row == 2){
let cell3 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier3, for: indexPath) as! springQuarterCell
cell3.layer.borderColor = UIColor.green.cgColor
cell3.layer.borderWidth = 2
cell3.layer.cornerRadius = 5
cell3.quarters = self.quarters[2]
return cell3
}
else if (indexPath.row == 3){
let cell4 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier4, for: indexPath) as! summerQuarterCell
cell4.layer.borderColor = UIColor.red.cgColor
cell4.layer.borderWidth = 2
cell4.layer.cornerRadius = 5
cell4.quarters = self.quarters[3]
return cell4
}
else{
return UICollectionViewCell()
}
}
@objc func buttonAction(sender: UIButton!) {
switch sender.tag {
case 0:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 1:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 2:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 3:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
default:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
}
}
}
extension yearOne : UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = (view.frame.width - 30)
return CGSize(width: width, height: 200)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 8
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
UIEdgeInsets(top: 30, left: 10, bottom: 30, right: 10)
}
}
class fallQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource {
// var data = UserDefaults.standard.object(forKey: "SavedArray") as? [String] ?? [String](){
// didSet{
// self.tableView.reloadData()
// }
// }
static var data: [String] = []
// func load(){
// if let loadeddata: [String] = UserDefaults.standard.object(forKey: "SavedArray") as? [String] {
// data = loadeddata
// tableView.reloadData()
// }
// }
let cellId = "coursesName"
let tableView:UITableView = {
let tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.backgroundColor = UIColor.white
return tableView
}()
override init(frame: CGRect){
super.init(frame: frame)
addSubview(tableView)
setupView()
}
func setupView(){
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
tableView.delegate = self
tableView.dataSource = self
self.backgroundColor = UIColor.white
contentView.addSubview(quarterLabel)
contentView.addSubview(addButton)
quarterLabel.translatesAutoresizingMaskIntoConstraints = false
quarterLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
quarterLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
addButton.translatesAutoresizingMaskIntoConstraints = false
addButton.topAnchor.constraint(equalTo: quarterLabel.topAnchor, constant: -5).isActive = true
addButton.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
addButton.heightAnchor.constraint(equalToConstant: 25).isActive = true
addButton.widthAnchor.constraint(equalToConstant: 25).isActive = true
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 35).isActive = true
tableView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 5).isActive = true
tableView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
tableView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -5).isActive = true
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fallQuarterCell.data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
let stringLabel = fallQuarterCell.data[indexPath.row]
cell.textLabel?.text = stringLabel
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 40
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
if (indexPath.row == 0){
fallQuarterCell.data.remove(at: 0)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 1){
fallQuarterCell.data.remove(at: 1)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 2){
fallQuarterCell.data.remove(at: 2)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 3){
fallQuarterCell.data.remove(at: 3)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 4){
fallQuarterCell.data.remove(at: 4)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
//add class information???
}
var quarters: customLabel? {
didSet {
guard let quarters = quarters else {return}
quarterLabel.text = quarters.title
}
}
let quarterLabel : UILabel = {
let label = UILabel()//frame: CGRect(x: 15, y: -75, width: 300, height: 50))
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = UIColor.black
label.font = UIFont.boldSystemFont(ofSize: 16)
//label.textAlignment = .center
return label
}()
let addButton : UIButton = {
let button = UIButton()//frame: CGRect(x: 345, y: 10, width: 30, height: 30))
button.setImage(UIImage(named: "addicon"), for: .normal)
button.imageEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
button.tag = 0
button.addTarget(self, action: #selector(yearOne.buttonAction), for: .touchUpInside)
return button
}()
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
我也有
class winterQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class springQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class summerQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
类似于fallQuarterCell()。我使用 print(fallQuarterCell.data) 来查看委托是否有效以及数据字符串是否追加，它似乎确实追加到数组，只是当从 SearchPage() 退出时它不会出现在 fallQuarterCell tableView 上
这里是 'SearchPage()where the user clicks on an element from the tableView to append to thefallQuarterCell.datathrough delegation and automatically pop backs toyearOne()`:
import UIKit
protocol coursesDelegate {
func sendDataBackFall(data: String)
func sendDataBackWinter(data2: String)
func sendDataBackSpring(data3: String)
func sendDataBackSummer(data4: String)
}
class SearchPage: UITableViewController {
var delegate: coursesDelegate?
let cellId = "course"
var allCourses : NSArray = NSArray()
var filteredCourses = [String]()
var resultSearchController = UISearchController()
var tag: Int?
@objc func addTapped(sender: UIBarButtonItem!) {
let addAlert = UIAlertController(title: "Create New Course", message: "Enter a course name", preferredStyle: .alert)
addAlert.addTextField {(textfield:UITextField) in textfield.placeholder = "Course"}
addAlert.addAction(UIAlertAction(title: "Create", style: .default, handler: { (action:UIAlertAction) in
var _customCourse = String()
if let courseTextField = addAlert.textFields?.first, let customCourse = courseTextField.text{
_customCourse = customCourse
}
}))
addAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(addAlert, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
let courses : CourseList = CourseList()
allCourses = courses.coursesList
navigationItem.title = "Select Courses"
navigationController?.navigationBar.prefersLargeTitles = true
let button1 = UIBarButtonItem(title: "Add Course", style: .plain, target: self, action: #selector(addTapped))
self.navigationItem.rightBarButtonItem = button1
self.view.backgroundColor = .systemBackground
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
tableView.delegate = self
tableView.dataSource = self
self.tableView.tableFooterView = UIView()
resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.obscuresBackgroundDuringPresentation = false
controller.searchBar.placeholder = "Search Courses"
controller.searchBar.sizeToFit()
tableView.tableHeaderView = controller.searchBar
return controller
})()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (resultSearchController.isActive) {
return filteredCourses.count
}
else{
return allCourses.count
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
if (resultSearchController.isActive) {
cell.textLabel?.text = filteredCourses[indexPath.row]
return cell
}
else {
let courses = self.allCourses[indexPath.row]
cell.textLabel?.text = courses as? String
return cell
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
tableView.deselectRow(at: indexPath, animated: true)
if (tag == 0){
if (resultSearchController.isActive){
// fallQuarterCelll.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(fallQuarterCelll.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = filteredCourses[indexPath.row]
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
}
else{
// fallQuarterCelll.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(fallQuarterCelll.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = allCourses[indexPath.row] as! String
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
}
}
}
var isSearchBarEmpty: Bool {
return resultSearchController.searchBar.text?.isEmpty ?? true
}
}
extension SearchPage: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
filteredCourses.removeAll(keepingCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
let array = (allCourses as NSArray).filtered(using: searchPredicate)
filteredCourses = array as! [String]
self.tableView.reloadData()
}
}
忽略 UsersDefault...我试图让数据首先出现在 fallQuarterCell tableView 上。
您没有在 fallQuarterCell 中重新加载 table 视图。
let vc = fallQuarterCell() 创建一个新单元格。您的集合视图不包含它，因此 vc.tableView.reloadData() 什么都不做。
当您使用 collectionView.dequeueReusableCell 时，您可能会得到旧的单元格，因此您应该重新加载此单元格中的 table 视图。你应该阅读 documentation:
Call this method from your data source object when asked to provide a
new cell for the collection view. This method dequeues an existing
cell if one is available or creates a new one
例如可以在fallQuarterCell中添加func updateViews():
func updateViews() {
tableView.reloadData()
}
并在这里调用它：
if (indexPath.row == 0){
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier, for: indexPath) as! fallQuarterCell
cell1.layer.borderColor = UIColor.orange.cgColor
cell1.layer.borderWidth = 2
cell1.layer.cornerRadius = 5
cell1.quarters = self.quarters[0]
cell1.updateViews()
return cell1
}
您所要做的就是为集合视图单元格创建一个单独的单元格 class，并为该单元格 class.[=11= 创建一个 table 视图的出口]
在 cellForItemAt 方法中 集合视图 执行以下代码：
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TabelCell", for: indexPath) as! MyTabelCell
cell.MyTableView.reloadData()
}
现在您必须重新加载 集合视图，它会自动重新加载table 视图。这是在 CollectionView
中处理 TableView 的最好和最简单的方法
我尝试了 viewWillAppear、tableView.reloadData() 和 collectionView.reloadData()，但数据数组似乎从未出现
import UIKit
class yearOne: UICollectionViewController, coursesDelegate {
let customCellIdentifier = "cellID"
let customCellIdentifier2 = "cellID2"
let customCellIdentifier3 = "cellID3"
let customCellIdentifier4 = "cellID4"
let quarters = [
customLabel (title: "Fall Quarter"),
customLabel (title: "Winter Quarter"),
customLabel (title: "Spring Quarter"),
customLabel (title: "Summer Quarter")
]
func sendDataBackFall(data: String) {
fallQuarterCell.data.append(data)
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackWinter(data2: String) {
winterQuarterCell.data.append(data2)
//UserDefaults.standard.set(winterQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackSpring(data3: String) {
springQuarterCell.data.append(data3)
//UserDefaults.standard.set(springQuarterCell.data, forKey: "SavedArray")
}
func sendDataBackSummer(data4: String) {
summerQuarterCell.data.append(data4)
//UserDefaults.standard.set(summerQuarterCell.data, forKey: "SavedArray")
}
let vc = fallQuarterCell()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("1")
print(fallQuarterCell.data)
vc.tableView.reloadData()
collectionView.reloadData()
print("2")
print(fallQuarterCell.data)
}
override func viewDidLoad() {
super.viewDidLoad()
collectionView.dataSource = self
collectionView.delegate = self
self.collectionView!.register(fallQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier)
self.collectionView!.register(winterQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier2)
self.collectionView!.register(springQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier3)
self.collectionView!.register(summerQuarterCell.self, forCellWithReuseIdentifier: customCellIdentifier4)
navigationItem.title = "Year One"
navigationController?.navigationBar.prefersLargeTitles = true
collectionView?.backgroundColor = .lightGray
//navigationItem.prompt = "Click the + button to add courses, Swipe left on a course to delete."
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return quarters.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if (indexPath.row == 0){
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier, for: indexPath) as! fallQuarterCell
cell1.layer.borderColor = UIColor.orange.cgColor
cell1.layer.borderWidth = 2
cell1.layer.cornerRadius = 5
cell1.quarters = self.quarters[0]
return cell1
}
else if (indexPath.row == 1){
let cell2 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier2, for: indexPath) as! winterQuarterCell
cell2.layer.borderColor = UIColor.blue.cgColor
cell2.layer.borderWidth = 2
cell2.layer.cornerRadius = 5
cell2.quarters = self.quarters[1]
return cell2
}
else if (indexPath.row == 2){
let cell3 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier3, for: indexPath) as! springQuarterCell
cell3.layer.borderColor = UIColor.green.cgColor
cell3.layer.borderWidth = 2
cell3.layer.cornerRadius = 5
cell3.quarters = self.quarters[2]
return cell3
}
else if (indexPath.row == 3){
let cell4 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier4, for: indexPath) as! summerQuarterCell
cell4.layer.borderColor = UIColor.red.cgColor
cell4.layer.borderWidth = 2
cell4.layer.cornerRadius = 5
cell4.quarters = self.quarters[3]
return cell4
}
else{
return UICollectionViewCell()
}
}
@objc func buttonAction(sender: UIButton!) {
switch sender.tag {
case 0:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 1:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 2:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
case 3:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
default:
let destination = SearchPage()
destination.delegate = self
destination.tag = sender.tag
navigationController?.pushViewController(destination, animated: true)
}
}
}
extension yearOne : UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = (view.frame.width - 30)
return CGSize(width: width, height: 200)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 8
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
UIEdgeInsets(top: 30, left: 10, bottom: 30, right: 10)
}
}
class fallQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource {
// var data = UserDefaults.standard.object(forKey: "SavedArray") as? [String] ?? [String](){
// didSet{
// self.tableView.reloadData()
// }
// }
static var data: [String] = []
// func load(){
// if let loadeddata: [String] = UserDefaults.standard.object(forKey: "SavedArray") as? [String] {
// data = loadeddata
// tableView.reloadData()
// }
// }
let cellId = "coursesName"
let tableView:UITableView = {
let tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.backgroundColor = UIColor.white
return tableView
}()
override init(frame: CGRect){
super.init(frame: frame)
addSubview(tableView)
setupView()
}
func setupView(){
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
tableView.delegate = self
tableView.dataSource = self
self.backgroundColor = UIColor.white
contentView.addSubview(quarterLabel)
contentView.addSubview(addButton)
quarterLabel.translatesAutoresizingMaskIntoConstraints = false
quarterLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
quarterLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
addButton.translatesAutoresizingMaskIntoConstraints = false
addButton.topAnchor.constraint(equalTo: quarterLabel.topAnchor, constant: -5).isActive = true
addButton.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
addButton.heightAnchor.constraint(equalToConstant: 25).isActive = true
addButton.widthAnchor.constraint(equalToConstant: 25).isActive = true
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 35).isActive = true
tableView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 5).isActive = true
tableView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
tableView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -5).isActive = true
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fallQuarterCell.data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
let stringLabel = fallQuarterCell.data[indexPath.row]
cell.textLabel?.text = stringLabel
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 40
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
if (indexPath.row == 0){
fallQuarterCell.data.remove(at: 0)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 1){
fallQuarterCell.data.remove(at: 1)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 2){
fallQuarterCell.data.remove(at: 2)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 3){
fallQuarterCell.data.remove(at: 3)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
else if (indexPath.row == 4){
fallQuarterCell.data.remove(at: 4)
self.tableView.reloadData()
//UserDefaults.standard.set(fallQuarterCell.data, forKey: "SavedArray")
}
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
//add class information???
}
var quarters: customLabel? {
didSet {
guard let quarters = quarters else {return}
quarterLabel.text = quarters.title
}
}
let quarterLabel : UILabel = {
let label = UILabel()//frame: CGRect(x: 15, y: -75, width: 300, height: 50))
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = UIColor.black
label.font = UIFont.boldSystemFont(ofSize: 16)
//label.textAlignment = .center
return label
}()
let addButton : UIButton = {
let button = UIButton()//frame: CGRect(x: 345, y: 10, width: 30, height: 30))
button.setImage(UIImage(named: "addicon"), for: .normal)
button.imageEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
button.tag = 0
button.addTarget(self, action: #selector(yearOne.buttonAction), for: .touchUpInside)
return button
}()
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
我也有
class winterQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class springQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class summerQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
类似于fallQuarterCell()。我使用 print(fallQuarterCell.data) 来查看委托是否有效以及数据字符串是否追加，它似乎确实追加到数组，只是当从 SearchPage() 退出时它不会出现在 fallQuarterCell tableView 上
这里是 'SearchPage()where the user clicks on an element from the tableView to append to thefallQuarterCell.datathrough delegation and automatically pop backs toyearOne()`:
import UIKit
protocol coursesDelegate {
func sendDataBackFall(data: String)
func sendDataBackWinter(data2: String)
func sendDataBackSpring(data3: String)
func sendDataBackSummer(data4: String)
}
class SearchPage: UITableViewController {
var delegate: coursesDelegate?
let cellId = "course"
var allCourses : NSArray = NSArray()
var filteredCourses = [String]()
var resultSearchController = UISearchController()
var tag: Int?
@objc func addTapped(sender: UIBarButtonItem!) {
let addAlert = UIAlertController(title: "Create New Course", message: "Enter a course name", preferredStyle: .alert)
addAlert.addTextField {(textfield:UITextField) in textfield.placeholder = "Course"}
addAlert.addAction(UIAlertAction(title: "Create", style: .default, handler: { (action:UIAlertAction) in
var _customCourse = String()
if let courseTextField = addAlert.textFields?.first, let customCourse = courseTextField.text{
_customCourse = customCourse
}
}))
addAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(addAlert, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
let courses : CourseList = CourseList()
allCourses = courses.coursesList
navigationItem.title = "Select Courses"
navigationController?.navigationBar.prefersLargeTitles = true
let button1 = UIBarButtonItem(title: "Add Course", style: .plain, target: self, action: #selector(addTapped))
self.navigationItem.rightBarButtonItem = button1
self.view.backgroundColor = .systemBackground
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
tableView.delegate = self
tableView.dataSource = self
self.tableView.tableFooterView = UIView()
resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.obscuresBackgroundDuringPresentation = false
controller.searchBar.placeholder = "Search Courses"
controller.searchBar.sizeToFit()
tableView.tableHeaderView = controller.searchBar
return controller
})()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (resultSearchController.isActive) {
return filteredCourses.count
}
else{
return allCourses.count
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
if (resultSearchController.isActive) {
cell.textLabel?.text = filteredCourses[indexPath.row]
return cell
}
else {
let courses = self.allCourses[indexPath.row]
cell.textLabel?.text = courses as? String
return cell
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
tableView.deselectRow(at: indexPath, animated: true)
if (tag == 0){
if (resultSearchController.isActive){
// fallQuarterCelll.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(fallQuarterCelll.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = filteredCourses[indexPath.row]
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
}
else{
// fallQuarterCelll.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(fallQuarterCelll.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = allCourses[indexPath.row] as! String
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
}
}
}
var isSearchBarEmpty: Bool {
return resultSearchController.searchBar.text?.isEmpty ?? true
}
}
extension SearchPage: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
filteredCourses.removeAll(keepingCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
let array = (allCourses as NSArray).filtered(using: searchPredicate)
filteredCourses = array as! [String]
self.tableView.reloadData()
}
}
忽略 UsersDefault...我试图让数据首先出现在 fallQuarterCell tableView 上。
您没有在 fallQuarterCell 中重新加载 table 视图。
let vc = fallQuarterCell() 创建一个新单元格。您的集合视图不包含它，因此 vc.tableView.reloadData() 什么都不做。
当您使用 collectionView.dequeueReusableCell 时，您可能会得到旧的单元格，因此您应该重新加载此单元格中的 table 视图。你应该阅读 documentation:
Call this method from your data source object when asked to provide a new cell for the collection view. This method dequeues an existing cell if one is available or creates a new one
例如可以在fallQuarterCell中添加func updateViews():
func updateViews() {
tableView.reloadData()
}
并在这里调用它：
if (indexPath.row == 0){
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: customCellIdentifier, for: indexPath) as! fallQuarterCell
cell1.layer.borderColor = UIColor.orange.cgColor
cell1.layer.borderWidth = 2
cell1.layer.cornerRadius = 5
cell1.quarters = self.quarters[0]
cell1.updateViews()
return cell1
}
您所要做的就是为集合视图单元格创建一个单独的单元格 class，并为该单元格 class.[=11= 创建一个 table 视图的出口]
在 cellForItemAt 方法中 集合视图 执行以下代码：
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TabelCell", for: indexPath) as! MyTabelCell
cell.MyTableView.reloadData()
}
现在您必须重新加载 集合视图，它会自动重新加载table 视图。这是在 CollectionView
中处理 TableView 的最好和最简单的方法