Swift presentViewController

I programatically have multiple View Controllers in an iOS Swift Project. I do not have the storyboards and would like to avoid them if possible. Is there a way to switch to another viewcontroller.swift file (We will call it view2.swift) and have it be part of a function that a button calls?
I have tried the following:

let storyboard: UIStoryboard = UIStoryboard(name: "myTabBarName", bundle: nil)
let vc: UIViewController = storyboard.instantiateViewControllerWithIdentifier("myVCID") as UIViewController
self.presentViewController(vc, animated: true, completion: nil)

The above works with storyboards, but I want another view2.swift to be called. Can this be done?

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最佳答案

Try this:

let vc = ViewController() //change this to your class name
self.presentViewController(vc, animated: true, completion: nil)

With Swift3:

self.present(vc, animated: true, completion: nil)
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For those getting blank/black screens this code worked for me.

    let vc = self.storyboard?.instantiateViewController(withIdentifier: myVCID) as! myVCName
self.present(vc, animated: true, completion: nil)

To set the "Identifier" to your VC just go to identity inspector for the VC in the storyboard. Set the 'Storyboard ID' to what ever you want to identifier to be. Look at the image below for reference.

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Solved the black screen by adding a navigation controller and setting the second view controller as rootVC.

let vc = ViewController()
var navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil
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Just use this : Make sure using nibName otherwise preloaded views of xib will not show :

var vc : ViewController = ViewController(nibName: "ViewController", bundle: nil) //change this to your class name

 self.presentViewController(vc, animated: true, completion: nil)
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You can use below code : 

var vc = self.storyboard?.instantiateViewControllerWithIdentifier("YourViewController") as! YourViewController;
vc.mode_Player = 1
self.presentViewController(vc, animated: true, completion: nil)
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Using Swift 2.1+

 let vc = self.storyboard?.instantiateViewControllerWithIdentifier("settingsVC") as! SettingsViewController
self.presentViewController(vc, animated: true, completion: nil)

enter image description here

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For me, I had two views in two separate nav controllers. I had to use a combination of the above.

var vc = self.storyboard?.instantiateViewControllerWithIdentifier("WelcomeViewController") as! WelcomeViewController
var navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil)

Swift 3.x

        let secondVC = self.storyboard?.instantiateViewController(withIdentifier: "VC-ID" as! yourViewController
let navigationVC = UINavigationController(rootViewController: secondVC)
self.present(navigationVC, animated: true, completion: nil)
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Another possibility is that you do not have the XIB included in your Build target (which is what happened to me).

This could happen if you have a different target for Dev, Test & Release Builds (which you should have anyway).

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For reference, because this question is one of the first Google result.

Breaking change in Swift 3:

The method presentViewController is replaced by the method present.

You can use it like the old one:

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

Example to open the camera:

let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.camera
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
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Swift 3 and Swift 4

let vc = self.storyboard?.instantiateViewController(withIdentifier: "idMyViewControllerName") as! MyViewControllerName
self.present(vc, animated: true, completion: nil)
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You can use code:

if let vc = self.storyboard?.instantiateViewController(withIdentifier: "secondViewController") as? secondViewController {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = vc
}
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You don't need to instantiate the ViewController in Storyboard just to get present() ViewController to work. That's a hackish solution.

If you see a black/blank screen when presenting a VC, it might be because you're calling present() from viewDidLoad() in the First/RootViewController, but the first View isn't ready yet.

Call present() from viewDidAppear to fix this, i.e.:

override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)


let yourVC = YourViewController()
self.present(yourVC, animated: true, completion: nil)
}

Once any "View" has appeared in your App, you can start calling present() from viewDidLoad().

Using UINavigationController (as suggested in an answer) is another option, but it might be an overkill to solve this issue. You might end up complicating the user flow. Use the UINavigationController based solution only if you want to have a NavigatonBar or want to return to the previous view controller.

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I had a similar issue but in my case, the solution was to dispatch the action as an async task in the main queue

DispatchQueue.main.async {
let vc = self.storyboard?.instantiateViewController(withIdentifier: myVCID) as! myVCName
self.present(vc, animated: true, completion: nil)
}
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It's already answered. But adding one more thing while presenting a UIViewController, If anyone is trying to add UIModalPresentationStyle :

if directly presenting the UIViewController as fullScreen:

let viewController = UIViewController()
viewController.modalPresentationStyle = .fullScreen
self.present(viewController, animated: true)

If there is UINavigationController with root view controller as UIViewController:

let viewController = UIViewController()
let navigationController = UINavigationController(rootViewController: viewController)
navigationController.modalPresentationStyle = .fullScreen
self.present(navigationController, animated: true)

More helpful answers:


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