Xcode Swift 回到之前的viewController (TableViewController) [英] Xcode Swift Go back to previous viewController (TableViewController)

问题描述

在我的 TableviewController 中，我的右上角有一个条形按钮项.单击按钮后，将显示一个新的视图控制器.在这个控制器中，我将一些数据输入到文本字段中并保存它们.要保存这些数据，我必须单击一个按钮，该按钮也是右上角的一个条形按钮项.

In my TableviewController I have a bar button item in the top right corner. After clicking the button a new view controller is shown. In this Controller I enter some data in to textfields and save them. To save this data I have to click on a button, which is also a bar button item in the right corner.

但现在它将我委托给我的应用程序的第一个视图控制器.我做了什么，它将我委托回表视图控制器?

But now it delegates me to the first view Controller of my app. What did I do, that it delegates me back to the table view controller?

当我使用以下代码时，应用程序给我一个 EXC_Breakpoint: (code=IEXC_386..) 的错误，然后它转到视图控制器 TeamOverviewController

When I use the following code, the app give me an error of EXC_Breakpoint: (code=IEXC_386..) and the it goes to the view controller TeamOverviewController

var vc = self.storyboard?.instantiateViewControllerWithIdentifier("TeamOverviewController") as ViewController
self.navigationController?.popToViewController(vc, animated: true)

推荐答案

看来该解决方案可以使用标准的展开转场".关于这个问题有很多帖子，但我总结了一种方法，希望与您的问题类似.

It appears that the solution could use a standard "unwind segue". There are a number of posts on this issue but I have summarized an approach which hopefully resembles your problem.

1. 我使用了一个 TableViewController，其右上角有一个名为Next"的条形按钮.单击 Next 时，它会显示一个 ViewController，您可以在其中放置任何输入控件.
2. ViewController 的右上角还有一个保存"按钮.
3. 两个控制器都嵌入在 NavigationControllers 中以方便导航
4. 当点击 Save 按钮时，它会在保存您需要保存的任何数据后返回到 TableViewController.
5. 在 TableViewController 中，您需要添加一个 IBAction 函数，我将其命名为 unwindToThisViewController 这是当您触摸 ViewController 中的保存按钮时被定向到的位置
6. 在 ViewController 中，您需要按住 Ctrl 键并从 Save 按钮拖动到 Exit 图标(ViewController Storyboard 中的第三个图标).当你这样做时，你会得到一个名为 unwindToThisViewController 的下拉选项作为你应该选择的呈现转场.现在您的 ViewController 已连接到 unwind segue 进程.
7. 在 ViewController 中，不要为 Save 按钮放置 IBActon.而是将您的保存命令放在函数 prepareForSegue 中.

1. I use a TableViewController with a bar button in the top right corner called "Next". When Next is clicked it displays a ViewController in which you can put any input controls.
2. The ViewController also has a "Save" button in the top right corner.
3. Both controllers are embedded in NavigationControllers to facilitate navigation
4. When the Save button is clicked, it returns to the TableViewController after saving whatever data you need to save.
5. In the TableViewController you need to add an IBAction function which I called unwindToThisViewController This is where you are directed to when you touch the Save button in ViewController
6. In ViewController you need to Ctrl-Drag from the Save button to the Exit icon (the third icon in the ViewController Storyboard). When you do that you will get a dropdown option with the name unwindToThisViewController as the presenting segue which you should select. Now your ViewController is connected to the unwind segue process.
7. In ViewController, do not put an IBActon for the Save button. Instead put your save commands in the function prepareForSegue.

这是两个控制器的代码:

Here is the code for the 2 controllers:

    //
//  TableViewController.swift

import UIKit

class TableViewController: UITableViewController {

    // add this function. When the detail ViewController is unwound, it executes this 
    // function

    @IBAction func unwindToThisViewController(segue: UIStoryboardSegue) {
        println("Returned from detail screen")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // Return the number of sections.
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {        
        // Return the number of rows in the section.
        return 3
    }


    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell

        // Configure the cell...
        cell.textLabel!.text = "Row: \(indexPath.row)"
        return cell
    }


}

    //
//  ViewController.swift
//  Detail View

import UIKit

class ViewController: UIViewController {

    // When Save button is clicked, view controller is segued to the TableViewController to the function
    // unwindToThisViewController

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Navigation

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Insert your save data statements in this function
        println("Insert your save data statements in this function")
    }


}

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