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我正在尝试在我的快速代码中实现 3D Touch Peek and Pop。当用户在查看视图上按得更深时，将出现一系列预览操作（共享、更新、删除）。

我需要的是当用户选择更新操作将移动到 UpdateView 控制器，但它不断崩溃。

这是我的代码：

HomePeakViewController.swift

let item3 = UIPreviewAction(title: "Update", style: .Default) { (action:UIPreviewAction, vc:UIViewController) -> Void in
        print("Update")

        let nb:BookAppointmentViewController = BookAppointmentViewController(nibName: "BookAppointmentViewController", bundle: nil)

        let root = UIApplication.sharedApplication().keyWindow?.rootViewController
        root?.presentViewController(nb, animated: true, completion: nil)

HomeViewController.swift 中的 POP 方法

func previewingContext(previewingContext: UIViewControllerPreviewing, commitViewController viewControllerToCommit: UIViewController) {

        let Homepeak = HomePeakViewController()
        showViewController(Homepeak, sender: self)

    }

我也尝试了这段代码来移动到更新屏幕，但它给了我（致命错误：在展开可选值时意外发现 nil）。

var top = UIApplication.sharedApplication().keyWindow?.rootViewController

            let test = AppointmentDetailsViewController()
            top!.presentViewController(test, animated: true, completion: {})
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1 回答 1

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也许你需要处理代表团：

例如：

extension MainViewController: UIViewControllerPreviewingDelegate {

    func previewingContext(previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
        if #available(iOS 9.0, *) {
            previewingContext.sourceRect = myButton!.bounds //optional
        }

        let homePeakViewController = UIStoryboard.homePeakViewController()
        homePeakViewController.delegate = self

        return homePeakViewController
    }


    func previewingContext(previewingContext: UIViewControllerPreviewing, commitViewController viewControllerToCommit: UIViewController) {
        let balanceViewController = viewControllerToCommit as! HomePeakViewController
        navigationController?.pushViewController(balanceViewController, animated: true)
    }

}

extension MainViewController: HomePeakViewControllerDelegate {

    func homePeakViewControllerUpadateActionTapped() {
      let bookAppointmentViewController = let nb:BookAppointmentViewController = BookAppointmentViewController(nibName: "BookAppointmentViewController", bundle: nil)
      navigationController?.pushViewController(bookAppointmentViewController, animated: true) //present as you want
    }

}

protocol HomePeakViewControllerDelegate {
  func homePeakViewControllerUpadateActionTapped()
}

class HomePeakViewController {

  var delegate: HomePeakViewControllerDelegate?

  @available(iOS 9.0, *)
  override func previewActionItems() -> [UIPreviewActionItem] {
    let item3 = UIPreviewAction(title: "Update", style: .Default) { (action:UIPreviewAction, vc:UIViewController) -> Void in
      delegate?.homePeakViewControllerUpadateActionTapped()
    }

    return [item3]
  }

}
于 2016-03-23T00:01:31.167 回答