Question

我有一个导航栏控制器。在一些动作之后，我需要弹出一个新视图，这是一个呈现的视图控制器。然后我如何获得顶视图？

我总是在导航堆栈上获得顶视图，但不是所呈现的视图。为什么呢？

@extends('layouts.dashboardmaster')

$quotetext = "quotes";

if ( $quotes == 1)
    { $quotetext = "quote"; }



@section('pageheading')
    <div class="well">
        <h2><i class = "fa fa-quote-left"></i> edit author ({{$author->author}}), ({{ number_format($quotes,0) }} {{}}$quotetext }}) </h2>
    </div>
@endsection

Answer 1

尝试

if let topController = myNavigationController.visibleViewController {
    print(topController)
}

Answer 2

Swift 3示例让顶级UIViewController呈现另一个UIViewController：

import UIKit

extension UIApplication {
    var topVC: UIViewController? {
        get {
            let rootVC = UIApplication.shared.keyWindow?.rootViewController

            if let nav = rootVC as? UINavigationController {
                return nav.visibleViewController
            } else if let tab = rootVC as? UITabBarController, let selected = tab.selectedViewController {
                return selected
            } else if let presented = rootVC?.presentedViewController {
                return presented
            }
            return rootVC
        }
    }
}

可以用：

来调用它

_ = UIApplication.shared.topVC?.present(yourViewController, animated: true)

如何获得作为呈现视图控制器的顶视图

2 个答案: