Swift-使用委托将数据附加到 CollectionView 中的 TableView
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【中文标题】Swift-使用委托将数据附加到 CollectionView 中的 TableView【英文标题】：Swift- Using Delegation to append data to TableView within CollectionView 【发布时间】：2020-02-15 00:08:39 【问题描述】：我有一个名为 yearOne 的 CollectionViewController，它看起来像这样：
当您单击每个四分之一单元格的添加按钮时，它会将您带到SearchPage：
我使用委托将点击SearchPage的数据附加到yearOne
当我尝试 print(vc.data) 时，代表团似乎工作并且数据似乎附加了，但是当通过navigationController?.popViewController(animated: true) 备份到yearOne viewcontroller 时，它似乎没有出现在 tableView 上我做错了什么吗？
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")
]
let vc = fallQuarterCell()
let vc2 = winterQuarterCell()
let vc3 = springQuarterCell()
let vc4 = summerQuarterCell()
func sendDataBackFall(data: String)
vc.data.append(data)
print(vc.data)
//UserDefaults.standard.set(vc.data, forKey: "SavedArray")
func sendDataBackWinter(data2: String)
vc2.data.append(data2)
func sendDataBackSpring(data3: String)
vc3.data.append(data3)
func sendDataBackSummer(data4: String)
vc4.data.append(data4)
override func viewWillAppear(_ animated: Bool)
super.viewWillAppear(animated)
vc.tableView.reloadData()
collectionView.reloadData()
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
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.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]()
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 data.count
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
cell.textLabel?.text = data[indexPath.row]
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)
data.remove(at: 0)
//UserDefaults.standard.set(data, forKey: "SavedArray")
self.tableView.reloadData()
else if (indexPath.row == 1)
data.remove(at: 1)
//UserDefaults.standard.set(data, forKey: "SavedArray")
self.tableView.reloadData()
else if (indexPath.row == 2)
data.remove(at: 2)
//UserDefaults.standard.set(data, forKey: "SavedArray")
self.tableView.reloadData()
else if (indexPath.row == 3)
data.remove(at: 3)
//UserDefaults.standard.set(data, forKey: "SavedArray")
self.tableView.reloadData()
else if (indexPath.row == 4)
data.remove(at: 4)
//UserDefaults.standard.set(data, forKey: "SavedArray")
self.tableView.reloadData()
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
//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，但排除了它。
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?
let vc = fallQuarterCell()
let vc2 = winterQuarterCell()
let vc3 = springQuarterCell()
let vc4 = summerQuarterCell()
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)
// vc.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(vc.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = filteredCourses[indexPath.row]
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
else
// vc.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(vc.data, forKey: "SavedArray")
// self.navigationController?.popViewController(animated: true)
let data = allCourses[indexPath.row] as! String
delegate?.sendDataBackFall(data: data)
self.navigationController?.popViewController(animated: true)
else if (tag == 1)
if (resultSearchController.isActive)
// vc2.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(vc2.data, forKey: "SavedArray2")
// self.navigationController?.popViewController(animated: true)
let data = filteredCourses[indexPath.row]
delegate?.sendDataBackWinter(data2: data)
self.navigationController?.popViewController(animated: true)
else
// vc2.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(vc2.data, forKey: "SavedArray2")
// self.navigationController?.popViewController(animated: true)
let data = allCourses[indexPath.row] as! String
delegate?.sendDataBackWinter(data2: data)
self.navigationController?.popViewController(animated: true)
else if (tag == 2)
if (resultSearchController.isActive)
// vc3.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(vc3.data, forKey: "SavedArray3")
// self.navigationController?.popViewController(animated: true)
else
// vc3.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(vc3.data, forKey: "SavedArray3")
// self.navigationController?.popViewController(animated: true)
else if (tag == 3)
if (resultSearchController.isActive)
// vc4.data.append(filteredCourses[indexPath.row])
// UserDefaults.standard.set(vc4.data, forKey: "SavedArray4")
// self.navigationController?.popViewController(animated: true)
else
// vc4.data.append(allCourses[indexPath.row] as! String)
// UserDefaults.standard.set(vc4.data, forKey: "SavedArray4")
// 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()
我注释掉了 UsersDefault.standard.set.... 因为数据本身似乎没有刷新并显示在 tableView atm 中
【问题讨论】：
我认为您的 collectionViewCell 的高度应该是动态的，而不是硬编码为 200。可能发生的情况是，数据正在添加，但 collectionView 单元格没有按照新的 tableviewHeight 扩展。跨度> 【参考方案1】：检查您的 cellForRow 方法。我不相信您将文本设置在任何地方。
【讨论】：
我在yearOne中有func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) cell.textLabel?.text = data[indexPath.row] return cell 以上是关于Swift-使用委托将数据附加到 CollectionView 中的 TableView的主要内容，如果未能解决你的问题，请参考以下文章
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