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标题: ios - 模态视图解除后重新加载 TableView [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-11 19:34
标题: ios - 模态视图解除后重新加载 TableView

我已经研究了很多关于这个主题的其他问题。但是它们都导致相同的事情“ View 确实加载了”“ View 确实出现了”和“ View 将出现”并且我放了

tableview.reloadData()

在所有这些中，但在模态视图关闭后，它仍然不会重新加载，直到我终止应用程序然后我再次运行。我已经看到您可以通过通知中心执行此操作，并且已经看到 Here我尝试了这种方法，但它似乎对我不起作用。 提前感谢您的任何帮助!!!

import UIKit

class mainScreen: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableview: UITableView!


func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}
// MARK: - Table View Setup
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if allPeople.count == theAssignments.count {
        return allPeople.count
    }else {
        print("else in number of rows in section BAD")
        return allPeople.count
    }
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "eopleTVCell", for: indexPath)
    cell.textLabel?.text = theAssignments[indexPath.row]
    cell.detailTextLabel?.text = allPeople[indexPath.row]
    return cell
}
// MARK: - System setup
override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view, typically from a nib.
    tableview.allowsSelection = false
    /////////here
    tableview.reloadData()
}
override func viewWillAppear(_ animated: Bool) {
    ////////here
    tableview.reloadData()
}

override func viewDidAppear(_ animated: Bool) {

    let NamesObject = UserDefaults.standard.object(forKey: "Name" + whatGroup)

    if let tempItems = NamesObject as? [String] {

        allPeople = tempItems

        print("saved data in main (Name)")
    }
    let AssignmentObject = UserDefaults.standard.object(forKey: whatGroup + "Assignment")

    if let tempItems = AssignmentObject as? [String] {

        theAssignments = tempItems

        print("saved data in main (Assignments)")
    }
    ////////here
    tableview.reloadData()
}
// MARK: - the Exit Segue
@IBAction func exitSegue(segue: UIStoryboardSegue) {
    /////////here
    tableview.reloadData()
    isAddingName = 2
    print("Exited to main")
}

}

这是我要添加东西的地方

@IBAction func saveButton(_ sender: UIButton) {
    if isInMain == true {

        if IsAddingAssignment == true {
// MARK: Add Assignment
            let AssignmentObject = UserDefaults.standard.object(forKey: whatGroup + "Assignment")  as? [String]

            var Assignment: [String]

            if let tempItems = AssignmentObject {

                Assignment = tempItems

                Assignment.append("\(EnteredObjectTextFeild.text!)")

                print(Assignment)

            } else {

                Assignment = [EnteredObjectTextFeild.text!]
                print("user defaults error 2")
            }

            UserDefaults.standard.set(Assignment, forKey: whatGroup + "Assignment")

            EnteredObjectTextFeild.text = ""
        }else {
// MARK: Add Name
            if AllNames.contains("\(EnteredObjectTextFeild.text!)"){
                if namesForEachGroup.contains(EnteredObjectTextFeild.text!) {
                    EnteredObjectTextFeild.text = ""
                    AlertAction(Title: "Name Exists", Message: "This name already exists in this group", alerTitle: "OK")
                }else {
                    addNameToGroup()
                    EnteredObjectTextFeild.text = ""
                }
            }else {
                let NameObject = UserDefaults.standard.object(forKey: "Name")  as? [String]

                var Name: [String]

                if let tempItems = NameObject {

                    Name = tempItems

                    Name.append("\(EnteredObjectTextFeild.text!)")

                    print(Name)

                } else {

                    Name = [EnteredObjectTextFeild.text!]
                    print("user defaults error 3")
                }

                UserDefaults.standard.set(Name, forKey: "Name")
                addNameToGroup()
                EnteredObjectTextFeild.text = ""
                NamePicker.reloadAllComponents()
                AsignmentPicker.reloadAllComponents()
            }

        }
        }else if isInMain == false {
// MARK: Add Group
        if allGroups.contains("\(EnteredObjectTextFeild.text!)"){
                EnteredObjectTextFeild.text = ""
                AlertAction(Title: "Group Exists", Message: "This Group already exists", alerTitle: "OK")
        }else {
            let groupsObject = UserDefaults.standard.object(forKey: "Groups")  as? [String]

            var groups: [String]

            if let tempItems = groupsObject {

                groups = tempItems

                groups.append(EnteredObjectTextFeild.text!)

                print(groups)

            } else {

                groups = [EnteredObjectTextFeild.text!]
                print("Bad")
            }

            UserDefaults.standard.set(groups, forKey: "Groups")

            EnteredObjectTextFeild.text = ""


        }
        NamePicker.reloadAllComponents()
        AsignmentPicker.reloadAllComponents()
    }
    NamePicker.reloadAllComponents()
    AsignmentPicker.reloadAllComponents()
    }
// MARK: Add Name func
func addNameToGroup(){
    let nameObject = UserDefaults.standard.object(forKey: "Name" + whatGroup)  as? [String]

    var NameForGroup: [String]

    if let tempItems = nameObject {

        NameForGroup = tempItems

        NameForGroup.append("\(EnteredObjectTextFeild.text!)")

        print(NameForGroup)

    } else {

        NameForGroup = [EnteredObjectTextFeild.text!]
        print("user defaults error 4")
    }

    UserDefaults.standard.set(NameForGroup, forKey: "Name" + whatGroup)
    namesForEachGroup = NameForGroup
    print("saved to group")
    EnteredObjectTextFeild.text = ""
    NamePicker.reloadAllComponents()
    AsignmentPicker.reloadAllComponents()
}

这就是我回到第一个 VC 的地方

@IBAction func BackPressed(_ sender: UIButton) {
    if isInMain == true {

        performSegue(withIdentifier: "FromAddToMain", sender: UIButton())

    }else {

        performSegue(withIdentifier: "FromAddToGroup", sender: UIButton())

    }
}

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Best Answer-推荐答案

最简单的解决方案是如何在undwin-perform中传递数据， 配置是； 在父 Controller 中创建一个函数，该函数将接收执行焦点:

  @IBAction func close (segue: UIStoryboard) {
     tableView.reload ()
  }

然后在子 Controller 中创建 undwin (向后)分配先前创建的关闭函数，并在输出函数中执行该行。

performsegue (whithIdentifier: "undwinSegueclose", sender: self)

关于ios - 模态视图解除后重新加载 TableView ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43611655/

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