通过按下标签栏按钮关闭viewController，保持黑屏迅速5 [英] Dismissing viewController by pressing on tabbar button remain black screen swift 5

问题描述

我有一个自定义的操作表viewController .在当前的顶视图控制器上以模态显示.像这样:

I have a custom action sheet viewController. Which is presented modally on the current top view controller. Like this:

//MARK: Static Func
    static func initViewController() -> CustomActionSheetViewController {
        let customActionSheetViewController = CustomActionSheetViewController(nibName: "CustomActionSheetViewController", bundle: nil)
        return customActionSheetViewController
    }

    func presentViewController<T: UIViewController>(viewController: T) {
        DispatchQueue.main.async {
            if let topViewController = UIApplication.getTopViewController() {
                viewController.modalTransitionStyle = .crossDissolve
                viewController.modalPresentationStyle = .overCurrentContext
                topViewController.present(viewController, animated: true, completion: nil)
            }
        }
    }

// MARK: UIApplication extensions
extension UIApplication {
    class func getTopViewController(base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? {
        if let nav = base as? UINavigationController {
            return getTopViewController(base: nav.visibleViewController)
        } else if let tab = base as? UITabBarController, let selected = tab.selectedViewController {
            return getTopViewController(base: selected)
        } else if let presented = base?.presentedViewController {
            return getTopViewController(base: presented)
        }
        return base
    }
}

我正在这样消除它:

@objc func dismissViewController() {
        DispatchQueue.main.async {
            if let topViewController = UIApplication.getTopViewController() {
               topViewController.dismiss(animated: true, completion: nil)
            }
            NotificationCenter.default.removeObserver(self)
        }
    }

工作正常.我在我的customTabbarController中添加了通知观察器，以在用户点击另一个tabbar按钮时关闭操作表，如下所示:

It's working perfectly fine. I have added the notification observer in my customTabbarController, to dismiss the action sheet if user tap on some another tabbar button like this:

func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
//        print("Selected view controller", viewController)
//        print("index", tabBarController.selectedIndex )
        let tabbarNotiKey = Notification.Name(rawValue: "TabbarNotiKey")
        NotificationCenter.default.post(name: tabbarNotiKey, object: nil, userInfo: nil)
    }

操作单现在显示在Home tab > Profile (by push) > Action sheet (by modal)上.因此，如果我再次点击主页"选项卡，它将关闭动作表viewController ，然后完美返回主页".但是，如果我点击其他一些标签栏按钮而不是首页，然后返回首页，它会显示黑屏.我在这里想念的是什么?任何建议都是非常可取的.

The action sheet is right now presenting on Home tab > Profile (by push) > Action sheet (by modal). So if I tap on Home tab again it will dismiss the action sheet viewController and come back to Home perfectly. But if I tap on some other tabbar button rather than home and come back home, it shows a black screen. What I am missing here? Any suggestions would be highly appreciable.

推荐答案

我猜您的代码两次调用dismissViewController().

I guess your code calls dismissViewController() twice.

1. 按下其他标签时，它会删除操作表
2. 然后单击主页"选项卡，它再次调用dismissViewController，现在它将删除homescreenVC

1. When you press other tab, it removes the action sheet
2. And then you click home tab and it calls dismissViewController again, and now it removes the homescreenVC

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