Ios 3DTouch上的SFSafariViewController出现问题（Pop状态）

我正在尝试在

TableViewController

中实现Peek和Pop功能，这样当我3次触摸任何单元格时，它会向我显示

SFSafariViewController

的预览，他们会带我去点击它们。peek功能工作正常，但一旦移动到弹出状态，它不会在中显示

SFSafariViewController

，而是从上一个视图显示导航控制器，并且显示

SFViewController

的视图尺寸很小

这就是我如何在我的

TableViewController中编程peek和pop功能的方法：

extension MyBlogsTableViewController: UIViewControllerPreviewingDelegate {

func previewingContext(previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
    if let indexPath = tableView.indexPathForRowAtPoint(location) {

            let cell = tableView.cellForRowAtIndexPath(indexPath) as! MyBlogsTableViewCell

            let destinationViewController = SFViewControllerToExplore(indexPath.row)
            destinationViewController.preferredContentSize = CGSize(width: 0.0, height: 0.0)

            previewingContext.sourceRect = cell.frame

            return destinationViewController
    }
    return nil
}

func previewingContext(previewingContext: UIViewControllerPreviewing, commitViewController viewControllerToCommit: UIViewController) {
    navigationController?.pushViewController(viewControllerToCommit, animated: true)
}

private func touchedView(view: UIView, location: CGPoint) -> Bool {
    let locationInView = view.convertPoint(location, fromView: tableView)
    return CGRectContainsPoint(view.bounds, locationInView)
}

private func SFViewControllerToExplore(index: Int) -> UIViewController {
    var destinationController: SFSafariViewController

    destinationController = SFSafariViewController(URL: NSURL(string: identifierOfLinks[index])!, entersReaderIfAvailable: true)

    return destinationController
}

}

我明白了。因此，在以下代码中：

func previewingContext(previewingContext: UIViewControllerPreviewing, commitViewController viewControllerToCommit: UIViewController) {
     navigationController?.pushViewController(viewControllerToCommit, animated: true)
}  

我实际上不应该使用pushViewController，而是应该使用presentViewController

更正代码：

func previewingContext(previewingContext: UIViewControllerPreviewing, commitViewController viewControllerToCommit: UIViewController) {
     navigationController?.presentViewController(viewControllerToCommit, animated: true, completion: nil)
}