【发布时间】：2018-07-02 20:55:14
【问题描述】：
我有一个显示购物清单名称的表格视图控制器。这些购物清单是通过购物清单类创建的，它允许我指定购物清单的名称和其中的项目。此表格视图显示大约 5 个购物清单（名称）。当我按下一个时，我转到另一个表格视图控制器，它显示了购物清单的项目。然而，当我回到购物清单（名称）表视图控制器并按下另一个购物清单时，它仍然显示旧购物清单中的项目，而不是被按下的项目。我想我已经将问题缩小到第二个表格视图控制器的 cellForItemAt 没有被再次调用。
import UIKit
class List: NSObject {
var name: String
var items: [String?]
var shared: String?
init(name: String, items: [String], shared: String?) {
self.name = name
self.items = items
self.shared = shared
}
}
enum ListType {
case apply
case view
}
class ListViewController: UITableViewController {
//Initialize Variables Here
let cellId = "cellId"
var lists: [List] = [
List(name: "Veggies", items: ["Fruit Loops", "Pasta"], shared: nil),
List(name: "11/17/18", items: ["Eggs", "Green Beans", "Pirate Booty", "Bread", "Milk"], shared: nil),
List(name: "Fruits", items: ["Fruit Loops", "Oranges"], shared: nil),
List(name: "Red Foods", items: ["Apples", "Tomatoes", "Watermelon", "Cherries"], shared: nil),
List(name: "Grains", items: ["Bread Crumbs", "Pasta", "Rice", "Chicken Flavored Rice"], shared: nil)
]
//Create Class Lazy Vars
lazy var newListVC: NewListViewController = {
let launcher = NewListViewController()
// launcher.homeController = self
return launcher
}()
lazy var listItemsVC: ListItemsViewController = {
let launcher = ListItemsViewController()
// launcher.homeController = self
return launcher
}()
//Setup Enums and Switches
var listType: ListType!
override func viewDidLoad() {
super.viewDidLoad()
//Things that both cases have in common:
navigationController?.navigationBar.prefersLargeTitles = true
let addBarButtonItem = UIBarButtonItem(title: "+", style: .plain, target: self, action: #selector(newList)) //+ Button
addBarButtonItem.setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "HelveticaNeue-Light", size: 27)!], for: .normal)
addBarButtonItem.setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "HelveticaNeue-Light", size: 27)!], for: .selected)
//SWITCH STATEMENT
switch listType as ListType {
case ListType.apply:
//Apply Begin
navigationItem.title = "Apply List"
//Setup Navigation Bar Items
let locateBarButtonItem = UIBarButtonItem(title: "Locate Item", style: .plain, target: self, action: nil)
//Add items to navigation bar
navigationItem.rightBarButtonItems = [addBarButtonItem, locateBarButtonItem]
//Apply End
case ListType.view:
//View Begin
//Setup Navigation Bar
navigationItem.title = "My Lists"
//Add items to navigation bar
navigationItem.rightBarButtonItem = addBarButtonItem
navigationItem.leftBarButtonItem = editButtonItem
//View End
}
//SWITCH STATEMENT END
//Register TableView with Id: cellId
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
}
@objc func newList() {
newListVC.pageControlFunc(pageView: PageView.name)
navigationController?.pushViewController(newListVC, animated: true) //Then pushes listVC
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return lists.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
cell.textLabel?.text = self.lists[indexPath.row].name //Then sets cell of indexPath text = lists value of index path
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
listItemsVC.listName = lists[indexPath.row].name
listItemsVC.listItems = lists[indexPath.row].items
print(listItemsVC.listItems)
navigationController?.pushViewController(listItemsVC, animated: true)
}
}
///////////////////////////////////////////////////////////////////////////
SECOND UITABLEVIEW - NOT UPDATING
///////////////////////////////////////////////////////////////////////////
import UIKit
class ListItemsViewController: UITableViewController {
//Initialize Variables Here
let cellId = "cellId1"
var listName: String?
var listItems: [String?] = []
override func viewDidLoad() {
super.viewDidLoad()
//Things that both cases have in common:
navigationController?.navigationBar.prefersLargeTitles = true
//Set Title
navigationItem.title = listName
//Register TableView with Id: cellId
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
//Delegate method not called on push to view
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return listItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
cell.textLabel?.text = listItems[indexPath.row] //Then sets cell of indexPath text = lists value of index path
return cell
}
}
提前致谢！
【问题讨论】：
-
请出示您当前的代码
-
请参考这个解决方案。 stackoverflow.com/questions/28430663/…
-
@ahmed 感谢您的建议。对不起，我想我的问题不清楚。我可以在 viewController 之间传递数据，但我认为是当我第二次推送 viewController 时，它不会更新 cellForItemAt: indexPath，即使正在更改影响它的变量。
-
@KaylaGalway 对不起，我是新手，我该怎么做？
-
点击编辑您的问题，然后复制并粘贴当前的表格视图代码 - 您的两个表格视图控制器中可能涉及或不涉及您的问题的任何代码
标签： ios uitableview swift4