Question

您好我试图提供一个viewcontroller并关闭我当前的模态视图，但此代码无法正常工作

self.dismissViewControllerAnimated(true, completion: {
    let vc = self.storyboard?.instantiateViewControllerWithIdentifier("OrderViewController")
    self.presentViewController(vc!, animated: true, completion: nil)
})

反之亦然，在presentviewcontroller的完成块上也不起作用

编辑：替换vc！自我

Answer 1

你必须获得呈现self（当前ViewController）的viewController。如果该视图控制器是rootViewController，您可以使用如下，如果不是该查询它基于您查看控制器层次结构。

float DeltaHeight = (FMath::Sin(RunningTime + DeltaTime) - FMath::Sin(RunningTime));
    NewLocation.Z += DeltaHeight * 20.0f; // Scale our height by a factor of 20

Answer 2

你不能这样做，因为当UIViewController A调用UIViewController B并且第一个控制器被解除时，两个控制器都是nil。

你需要有一个UIViewController作为基础，在这种情况下，MainViewController是基础。您需要使用协议来调用控制器之间的导航。

你可以使用协议，比如说如下： -

进入你的viewController设置协议：

    protocol FirstViewControllerProtocol {
    func dismissViewController()
}

class FirstViewController: UIViewController {
    var delegate:FirstViewControllerProtocol!

    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.
    }


    @IBAction func goBack(sender: AnyObject) {
        self.dismissViewControllerAnimated(true) { 
            self.delegate!.dismissViewController()
        }
    }

现在在主视图控制器中

class MainViewController: UIViewController, FirstViewControllerProtocol {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

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


@IBAction func goToFirstViewController(sender: AnyObject) {
    let viewController = self.storyboard?.instantiateViewControllerWithIdentifier(String(FirstViewController)) as! FirstViewController
    viewController.delegate = self
    self.presentViewController(viewController, animated: true, completion: nil)
}



//MARK: Protocol
func dismissViewController() {
    if let viewController = self.storyboard?.instantiateViewControllerWithIdentifier(String(SecondViewController)){
        self.presentViewController(viewController, animated: true, completion: nil)
    }
}

Code example with storyboard:

Answer 3

我认为你的代码中有一个错误，那就是＆＃39; self＆＃39;应该是呈现视图控制器来呈现＆＃39; vc＆＃39;而不是＆＃39; vc＆＃39;它的自我

您的代码

self.dismissViewControllerAnimated(true, completion: {
                let vc = self.storyboard?.instantiateViewControllerWithIdentifier("OrderViewController")
                vc!.presentViewController(vc!, animated: true, completion: nil)
            })

试试这个

self.dismissViewControllerAnimated(true, completion: {
                let vc = self.storyboard?.instantiateViewControllerWithIdentifier("OrderViewController")
                self.presentViewController(vc!, animated: true, completion: nil)
            })

希望这有用

Answer 4

 var hd = d3.keys(res[0]);

        for (var i = hd.length - 1; i >= 0; i--) {
            if( (hd[i] === "Station") || (hd[i] === "ID") || (hd[i] === "Elev") || (hd[i] === "Latitude")
                || (hd[i] === "Longitude") || (hd[i] === "County") || (hd[i] === "Nat_ID") || (hd[i] === "Year_Built")
                || (hd[i] === "Capacity")){
            }else{

            }
        }

Answer 5

这是Swift3的解决方案

呈现ViewController

let NotificationVC = self.storyboard?.instantiateViewController(withIdentifier: "NotificationVC") as! ExecutiveNotificationViewController

self.present(NotificationVC, animated: true, completion: nil)

关闭ViewController：

self.dismiss(animated: true, completion: nil)

Answer 6

if let vc = storyboard?.instantiateViewController(withIdentifier: "IdOfYourVC") {

    present(vc, animated: true, completion: nil)
}

Answer 7

快速4和5

weak var presentingVC = self.presentingViewController

self.dismiss(animated: true, completion: {
    let vc = SecondController()
    presentingVC?.present(vc, animated: true, completion: nil)
})

在Swift中关闭并呈现视图控制器

7 个答案: