在CollectionViewCell内快速重新加载TableViewCell

Question

我尝试过viewWillAppear，tableView.reloadData()和collectionView.reloadData()，但数据数组似乎从未显示出来

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)来查看委派是否有效，并追加了数据字符串，并且它似乎确实追加到了数组，只是当从SearchPage()]中退出时，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 the fallQuarterCell.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 ...我试图使数据首先出现在fallQuarterCell tableView上。

[我尝试过viewWillAppear，tableView.reloadData（）和collectionView.reloadData（），但是数据数组似乎从未显示出导入UIKit类yearOne：UICollectionViewController，coursesDelegate {...

Answer 1

您不会在fallQuarterCell中重新加载表格视图。

Answer 2

您要做的就是为集合视图单元格创建一个单独的单元格类，并在该单元格类中创建表视图的出口。