ios - 如何快速显示来自 UIPreviewAction 的 View Controller

Question

我确实支持 3D Touch，我这样做是为了当使用强力拉动 cell 时出现 Controller ，然后用户拿起它，向他展示 Action ，当用户点击它时会有一个按钮显示我想要的， Controller 完全打开。如何显示此 Controller ？

 @available(iOS 9.0, *)
override func previewActionItems() -> [UIPreviewActionItem] {
    let showAction = UIPreviewAction(title: "Show", style: .Default) { [weak self] (action: UIPreviewAction, vc: UIViewController) -> Void in
        guard let weakSelf = self else {
            return;
        }

        if let _popAction = weakSelf.popAction {
            _popAction()
        }
        self?.showViewController(vc, sender: nil)
        print("show city controller")
    }

    return [showAction]
}

Answer 1

我修改了代码

 @available(iOS 9.0, *)
override func previewActionItems() -> [UIPreviewActionItem] {
    let showAction = UIPreviewAction(title: "Show", style: .Default) { [weak self] (action: UIPreviewAction, vc: UIViewController) -> Void in
        guard let weakSelf = self else {
            return;
        }

        if let _popAction = weakSelf.popAction {
            _popAction()
        }
        self?.showViewController(vc, sender: nil)
        print("show city controller")
    }
    let cityController = CityController() 
    cityController.showPreviewController()
    return [showAction]
}