ios - 快速 3D Peek 和 POP

Question

我正在尝试在我的 swift 代码中实现 3D Touch Peek 和 Pop。当用户在预览 View 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”操作时将移动到 UpdateView Controller ，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)

    }

我也尝试使用此代码移动到更新屏幕，但它给了我( fatal error :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: {})

Answer 1

也许您需要处理委托(delegate):

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]
  }

}