How to do Push Segue Transition Properly

Question

我正在一个用Objective编写的应用程序（只有一个类）和用Swift编写的应用程序的其余部分。在我的应用程序中，我有3个故事板，这些故事板相应地有viewControllers。

问题：有时候我使用beow代码更改rootViewController，推送segues动画在此之后停止工作。

// constant to share globally 
let kApplicationDelegate = UIApplication.shared.delegate as? AppDelegate

let controller = UIStoryboard().getControllerInstance(storyBoardName: "Autograph", identifire: "loginSuccessVC")
kApplicationDelegate?.window?.rootViewController = controller

Answer 1

How to do Push Segue Transition Properly

I know it's bit late to reply for this Question! But better late than Never!

First things First:
For Push transition to work properly, you have to have UINavigationController hosting your current ViewController as the rootViewController. What the heck does that mean?

Example:
There are two or many ViewControllers (here onwards ViewController == VC) A, B, and more. If you are currently in VC A and you want to move to VC B doing a Push (or Detail) transition on a button action in VC A, then remember your VC A has to be the RootViewController of a UINavigationController.

[  UI         ]                          [     ]            [     ]
[  Navigation ]-- RootViewController ==O>[  A  ]--- Push -->[  B  ] 
[  Controller ]                          [     ]            [     ]

Otherwise it doesn't work. It would appear as a Present Modally transition.

So far there are two ways I have recongised to achieve this. One is pure programmatically, the other is using StoryBoard and Code hand in hand.

Programmatically:
For the ease of explaining I would embed my UINavigationController at the beginning of the UIViewController stack. In order to achieve this, we have to do a small alteration to AppDelegate's didFinishLaunchingWithOptions launchOptions method. It should look like following:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let initialVCIdentifier = "AViewController" // A ViewController **
    let firstVC = storyboard.instantiateViewController(withIdentifier: initialVCIdentifier)
    let nav = UINavigationController(rootViewController: firstVC) // Assigning the A VC as the RootViewController of the NavigationController
    window?.rootViewController = nav  // Look for the *** Note bellow
    window?.makeKeyAndVisible()

    return true
}

** You have to denote the ViewController Identifier for A VC within the InterfaceBuilder. And I assume that your storyboard name is Main.storyboard.
*** If you are not doing this for initial View controller, just present this UINavigationController as a modal VC within your VC workflow path

In the action for the button in VC A, it should look like following:

@IBAction func TestBtnAct(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "BViewController") as UIViewController
    navigationController?.pushViewController(vc, animated: true)
}

That's it! I think if you have tried it out as I've mentioned above, it should do the magic already.

Storyboard and Code hand-in-hand:
This means your VC A is already being hosted by a UINavigationController within the storyboard design. In this case you don't need to programmatically create the UINavigationController and embed the VC A as the RootViewController. Just having the above Button action might be sufficient.

Hope this would be helpful to someone out there. And here is a sample project I have done and uploaded in GitHub for learning purposes of all of yours.

Cheers!

Answer 2

当您更改rootViewController尝试将navigationController设置为根而不是navigationController的{{1}}时。

假设您有一个viewController，我们将它命名为rootViewController是VCA UINavigationController的rootViewController。然后，不要将Nav1设为VCA rootViewController。尝试将kApplicationDelegate?.window?作为Nav1的{{1}}。

rootViewController

动画无效，因为它可能不是kApplicationDelegate?.window?。你推动的kApplicationDelegate?.window?.rootViewController = Nav1的{{1}}可能是零。

推送segue动画不起作用

2 个答案:

How to do Push Segue Transition Properly