在Swift中的視圖控制器之間傳遞數據

Question

我正在嘗試將應用程序從Objective-C轉換為Swift，但是我找不到如何使用Swift在視圖之間傳遞數據。 我的Objective-C代碼是

UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
AnsViewController *ansViewController;
ansViewController = [storyBoard instantiateViewControllerWithIdentifier:@"ansView"];
ansViewController.num = theNum;
[self presentViewController:ansViewController animated:YES completion:nil];

這樣做是從根本上獲取變量TheNum，並將其傳遞給另一個視圖控制器上的變量num。 我知道這可能是一個簡單的問題，但是我對Swift感到非常困惑，因此，如果有人可以解釋他們如何將其更改為Swift，將不勝感激！

謝謝

Answer 1

假設我們站在firstView轉到DetailView，並希望將數據從firstView傳遞到Detailview。 要使用情節提要進行此操作，在firstView處，我們將有一個方法：

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
    if (segue.identifier == "segueTest") {
      //Checking identifier is crucial as there might be multiple
      // segues attached to same view
      var detailVC = segue!.destinationViewController as DetailViewController;
      detailVC.toPass = textField.text
    }
}

然后在DetailView類中聲明一個變量：

var toPass: String!

那么您可以使用變量toPass （當然，您可以根據需要更改變量的類型，在此EX中，我只是演示字符串類型）。

Answer 2

class AnsViewController: UIViewController {
   var theNum: Int

    override func viewDidLoad() {
        super.viewDidLoad()

        println(theNum)
    }

}

override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
    let viewController = self.storyboard.instantiateViewControllerWithIdentifier("ansView") as AnsViewController
    viewController.num = theNum
    self.presentViewController(viewController, animated: true, completion: nil)
}

Answer 3

快速將字符串或任何數據從一個控制器傳遞到另一個控制器。

遵循以下步驟：

1）在子控制器中將屬性創建為var abc:string!

2）創建子控制器的對象

let storyboard:UIStoryboard()
let viewController: childcontroller = storyboard.instantiateViewControllerWithIdentifier("childcontroller") as! childcontroller
viewController.abc = "hello";
self.navigationController.pushviewController(Controller:viewController animated:true CompletionHandler:nil)

Answer 4

Using tableview,

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
        {
            let ClubProfileView = self.storyboard?.instantiateViewController(withIdentifier: "CBClubProfileViewController") as! CBClubProfileViewController

            let TempCulubDic:NSDictionary =
                ((ClubsListbyDateDic.object(forKey:((ClubsListbyDateDic.allKeys as! [String]).sorted(by: <)as NSArray).object(at: indexPath.section) as! String) as! NSArray).object(at: indexPath.row))as! NSDictionary

            let ClubId:String=(TempCulubDic.value(forKey: "club_id") as? String)!

            let CheckIndate:String=(TempCulubDic.value(forKey: "chekin_date") as? String)!

            ClubProfileView.ClubID=ClubId

            ClubProfileView.CheckInDate = CheckIndate

            // self.tabBarController?.tabBar.isHidden=true

            ClubProfileView.hidesBottomBarWhenPushed = true
            self.navigationController?.pushViewController(ClubProfileView, animated: true)
            }

Answer 5

     @IBAction func nextbtnpreesd(_ sender: Any) {

            let mystring = "2"
            performSegue(withIdentifier: "MusicVC", sender: mystring)
        }



override func prepare(for segue: UIStoryboardSegue, sender: Any?) {


        if let destination = segue.destination as? MusicVC{

            if let song = sender as? String{
                destination.strlablevalie = song
            }
        }
    }

//在MusicVC中創建類似以下的字符串：

 var strlablevalie:String!

Answer 6

快速將字符串或任何數據從一個控制器傳遞到另一個控制器。

遵循以下步驟：

1）創建想要的類型的變量，例如（String，Int）var test：String！

2）創建子控制器的對象

 let vc = self.storyboard?.instantiateViewController(withIdentifier: "Here identifier of your VC") as! (Here Name Of Your Controller)
 vc.test = "Hello" (Or any data which you want to pass)
 self.navigationController?.pushViewController(VC, animated: true)

那應該解決你的問題

Answer 7

注意：如果我們使用情節提要

步驟1：主控制器：

    // table row which row was selected
    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
        tableView.deselectRowAtIndexPath(indexPath, animated: true)

        println("You selected cell #\(indexPath.row)!")

        nextScreenRow = indexPath.row

        // get to the next screen
        self.performSegueWithIdentifier("dashboard_static_screen_segue", sender: self)

    }

接着;

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {

        if (segue.identifier == "dashboard_static_screen_segue") {
            var detailController = segue.destinationViewController as StaticScreens;
            detailController.screenNumber = nextScreenRow
        }

    }// end prepareForSegue

步驟2：明細控制器（StaticScreen）

// set variable into your detail controller

var screenNumber: NSInteger?

println("selected row \(screenNumber!)")