I tried viewWillAppear, tableView.reloadData(), and collectionView.reloadData() but the data array never seems to show up
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")
}
}
I also have the
class winterQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class springQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
class summerQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource
similar to that of fallQuarterCell(). I used the print(fallQuarterCell.data) to see whether the delegation works and data string appends, and it does seem to append to the array, just that it won't appear on the fallQuarterCell tableView when backed out from the SearchPage()
Here is the '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()
}
}
Ignore the UsersDefault... I'm trying to make the data appear on the fallQuarterCell tableView first.
You don't reload table view in fallQuarterCell.
let vc = fallQuarterCell() creates a new cell. Your collection view doesn't contain it, so vc.tableView.reloadData() does nothing.
When you use collectionView.dequeueReusableCell, you may get the old cell, so you should reload the table view in this cell. You should read 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
For example, you can add func updateViews() in fallQuarterCell:
func updateViews() {
tableView.reloadData()
}
And call it here:
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
}