iOS 插件 怎样才能使用pushViewController跳转下一个页面呢？

// 获取当前显示的 UIViewController

• (UIViewController )dc_findCurrentShowingViewController {
  //获得当前活动窗口的根视图
  UIViewController vc = [UIApplication sharedApplication].keyWindow.rootViewController;
  UIViewController *currentShowingVC = [self findCurrentShowingViewControllerFrom:vc];
  return currentShowingVC;
  }

• (UIViewController )findCurrentShowingViewControllerFrom:(UIViewController )vc
  {
  // 递归方法 Recursive method
  UIViewController currentShowingVC;
  if ([vc presentedViewController]) {
  // 当前视图是被presented出来的
  UIViewController nextRootVC = [vc presentedViewController];
  currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];

  } else if ([vc isKindOfClass:[UITabBarController class]]) {
  // 根视图为UITabBarController
  UIViewController nextRootVC = [(UITabBarController )vc selectedViewController];
  currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];

  } else if ([vc isKindOfClass:[UINavigationController class]]){
  // 根视图为UINavigationController
  UIViewController nextRootVC = [(UINavigationController )vc visibleViewController];
  currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];

  } else {
  // 根视图为非导航类
  currentShowingVC = vc;
  }

  return currentShowingVC;
  }

iOS 插件 只能获取当前的控制器 能调用presentViewController 跳转下一个页面 怎样才能使用pushViewController跳转下一个页面呢？