在Swift中的视图控制器之间传递数据

Question

我正在尝试将应用程序从Objective-C转换为Swift,但我找不到如何使用Swift在视图之间传递数据.我的Objective-C代码是

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

它正在做的是它基本上取变量theNum,并将其传递给另一个视图控制器上的变量num.我知道这可能是一个简单的问题,但我对Swift非常困惑,所以如果有人能解释他们如何将其改为Swift,我将不胜感激!

谢谢

Answer 1

让我们假设我们站在firstView转到DetailView并希望将数据从firstView传递到Detailview.要使用storyboard,在firstView,我们将有一个方法:

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
    }
}

然后进入DetailView类我们声明了一个变量:

var toPass: String!

那么你可以使用变量toPass(当然你可以根据需要改变变量的类型,在这个EX我只是为字符串类型演示).

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)
}