郑州iOS點-Swift获取当前控制器最新版

// 当前控制器
    class func currentViewController() -> (UIViewController?) {
       var window = UIApplication.shared.keyWindow
       if window?.windowLevel != UIWindow.Level.normal{
         let windows = UIApplication.shared.windows
         for  windowTemp in windows{
           if windowTemp.windowLevel == UIWindow.Level.normal{
              window = windowTemp
              break
            }
          }
        }
       let vc = window?.rootViewController
       return currentVC(vc)
    }

    class private func currentVC(_ vc :UIViewController?) -> UIViewController? {
       if vc == nil {
          return nil
       }
       if let presentVC = vc?.presentedViewController {
          return currentVC(presentVC)
       }
       else if let tabVC = vc as? UITabBarController {
          if let selectVC = tabVC.selectedViewController {
              return currentVC(selectVC)
           }
           return nil
        }
        else if let naiVC = vc as? UINavigationController {
           return currentVC(naiVC.visibleViewController)
        }
        else {
           return vc
        }
     }