Question

我正在编写一个函数，当我的应用程序在本地收到远程通知时将调用该函数。首先，使用库BRYXBanner显示横幅，然后当用户点击横幅时，它将调用此函数，该函数应呈现名为ChatLogViewController的视图控制器。可以从app中的任何位置调用此函数，因此该函数的一个参数是fromViewController。我想弄清楚两个问题。

如何使用GoToChatLogVC（）函数从应用程序内的任何位置呈现ChatLogViewController

代码：

func GoToClassVC(fromVC : UIViewController, toClassID: String) {
    let chatLog = ChatLogViewController()
    fromVC.present(chatLog, animated: true) {
        chatLog.classID = toClassID
    }
}

如何将此函数分配给类型（（） - ＆gt;（））的属性？

guard let currentVC = self.window?.currentViewController() else {
    print("ERROR")
    return
}

let banner = Banner(title: title, subtitle: body, image: #imageLiteral(resourceName: "MessageIcon"), backgroundColor: UIColor(red:40.00/255.0, green:170.0/255.0, blue:226/255.0, alpha:1.000))

banner.show(duration: 3.0)

banner.didTapBlock = GoToClassVC(fromVC: currentVC, toClassID: self.backgroundLaunchClassID)

感谢您的帮助！

Answer 1

要解决此错误无法将类型'（）'的值指定为'（（） - ＆gt;（））？'

替换此代码

banner.didTapBlock = GoToClassVC(fromVC: currentVC, toClassID: self.backgroundLaunchClassID)

到这个

banner.didTapBlock = {
             self.GoToClassVC(fromVC: UIApplication.shared.keyWindow!.visibleViewController()!, toClassID:"string")
        }

For This：如何使用函数ChatLogViewController
在应用内的任何位置展示GoToChatLogVC()

您的currentVC替换为UIApplication.shared.keyWindow!.visibleViewController()!

extension UIWindow {

    func visibleViewController() -> UIViewController? {
        if let rootViewController: UIViewController = self.rootViewController {
            return UIWindow.getVisibleViewControllerFrom(vc: rootViewController)
        }
        return nil
    }

    class func getVisibleViewControllerFrom(vc:UIViewController) -> UIViewController {

        if vc.isKind(of:UINavigationController.self) {

            let navigationController = vc as! UINavigationController
            return UIWindow.getVisibleViewControllerFrom( vc: navigationController.viewControllers.first!)

        } else if vc.isKind(of:UITabBarController.self) {

            let tabBarController = vc as! UITabBarController
            return UIWindow.getVisibleViewControllerFrom(vc: tabBarController.selectedViewController!)

        }else if vc.isKind(of:UIAlertController.self) {

            let tabBarController = vc as! UIAlertController
            return UIWindow.getVisibleViewControllerFrom(vc: tabBarController)

        } else {

            if let presentedViewController = vc.presentedViewController {
                if (presentedViewController.presentedViewController != nil){
                    return UIWindow.getVisibleViewControllerFrom(vc: presentedViewController.presentedViewController!)
                }else{
                    return UIViewController()
                }

            } else {

                return vc;
            }
        }
    }
}

Answer 2

如果您想从任何地方展示ViewController，那么您可以在let status_height = UIApplication.sharedApplication().statusBarFrame.size.width的{{1}}上展示它，如下所示。

rootViewController

Answer 3

要从app delegate呈现视图控制器，您可以使用以下内容：

(if(a.getAttribute('data-type') == 'Recommended'){})

Answer 4

最好的方法是：

1-在AppDelegate类的顶部添加此扩展名：

extension UIApplication{
    var topViewController: UIViewController?{
        if keyWindow?.rootViewController == nil{
            return keyWindow?.rootViewController
        }

        var pointedViewController = keyWindow?.rootViewController

        while  pointedViewController?.presentedViewController != nil {
            switch pointedViewController?.presentedViewController {
            case let navagationController as UINavigationController:
                pointedViewController = navagationController.viewControllers.last
            case let tabBarController as UITabBarController:
                pointedViewController = tabBarController.selectedViewController
            default:
                pointedViewController = pointedViewController?.presentedViewController
            }
        }
        return pointedViewController

    }
}

2-现在，您可以轻松呈现视图控制器：

let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "net")
application.topViewController?.present(vc, animated: true, completion: nil)

从AppDelegate呈现ViewController

4 个答案: