如何从 ViewController 传递数据以嵌入视图控制器

Question

我有一个视图控制器，用户在其中点击按钮并移动到第二个视图，我想将一些数据传递给它，但是第二个视图有一个导航视图控制器，所以 prepareForSegue() 在这里不起作用。我应该将数据传递给 Navigation View，然后再传递给 Second View 还是做其他事情？

Answer 1

-(IBAction)moveToSecondViewButtonClicked:(UIButton*)sender {
    SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    secondViewController.data = data;
    [self.navigationController pushViewController:secondViewController animated:YES];
}

Answer 2

如果你的数据量适中，可以使用NSNotificationCenter来传递数据。

发件人Class

- (void)sendNotification {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:YOUR_DATA];
}

接收者class

- (void)viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self
        selector:@selector(receiveNotification:) 
        name:@"myNotification"
        object:nil];
}

- (void)receiveNotification:(NSNotification *)notification
{
    if ([[notification name] isEqualToString:@"myNotification"]) {

        //doSomething here.
    }
}

希望对您有所帮助

Answer 3

不要从 viewcontroller 转到 UIViewController。您必须将 viewcontroller 转至新 UIViewController 的 UINavigationController。您可以在 prepareForSegue 方法中传递数据。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.

    if segue.identifier == "showNavigationController"{
        let navController : UINavigationController  = segue.destinationViewController as! UINavigationController
        let viewController : UIViewController = navController.viewControllers[0] as! UIViewController
        viewController.data = yourData
    }
}

Answer 4

据此：https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/topViewController ，以下解决方案更正确：使用 UINavitaionController 的 "topViewController"。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
    let segueID = segue.identifier ?? ""

    switch segueID
    {
        case "toMyNextVC":
            let nc = segue.destinationViewController as! UINavigationController
            let destinationVC = nc.topViewController as! MyNextViewController
            destinationVC.varToPass = myVarToPass

        default:
            break
    }
}

如何从 ViewController 传递数据以嵌入视图控制器

How to pass data from ViewController to embed View Controller

viewcontroller

ios

segue

swift