如何在 SWIFT 中重绘我的视图? [英] How to redraw my view in SWIFT?

问题描述

在我的 iPad 应用程序上，我有一个 UIViewController 和一个按钮，可以打开一个 modalView.

On my iPad app, I have a UIViewController with a button that open a modalView.

@IBAction func showPostCommentViewController(sender: AnyObject){

    let modalView = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("PostCommentViewController") as! PostCommentViewController
    modalView.modalTransitionStyle = UIModalTransitionStyle.CoverVertical
    modalView.modalPresentationStyle = UIModalPresentationStyle.FormSheet
    modalView.delegate=self
    self.presentViewController(modalView, animated: true, completion: nil)
}

当我使用dismissViewControllerAnimated 关闭modalView 时，我想刷新"我的视图控制器(因为我添加了新内容).但由于模态视图是表单"样式，因此不会调用 viewDidAppear 或 viewWillAppear.

When I close the modalView with dismissViewControllerAnimated, I would like "refresh" my view controller (because I added new content). But as the modal view is a "formsheet" style, viewDidAppear or viewWillAppear aren't called.

我尝试使用 setNeedsDisplay，但它不起作用.

I tried to use setNeedsDisplay, but it doesn't work.

我不知道该怎么办.

推荐答案

这将是委托模式的完美用例.

This would be a perfect use case for the delegate pattern.

1) 在 PostCommentViewController 中定义一个协议.

1) define a protocol within PostCommentViewController.

protocol PostCommentVCInformationDelegate {
    func hasDismissedPostCommentViewController(controller:PostCommentViewController)
}

2) 在 PostCommentViewController

var delegate: PostCommentVCInformationDelegate?

3) 当您关闭 PostCommentViewController 时，您将调用 delegate?.hasDismissedPostCommentViewController(self)

3) When you dismiss PostCommentViewController, you will call delegate?.hasDismissedPostCommentViewController(self)

这会将信息发送回呈现的 VC.

This will send information back to the presenting VC.

4) 现在我们的呈现视图控制器符合这个协议.

4) Now we have our presenting View Controller conform to this protocol.

class ViewController: UIViewController, PostCommentVCInformationDelegate

5) 当呈现模态视图时:

5) When presenting the modal View:

modalView.delegate = self

6) 最后，我们实现:

6) Finally, we implement:

func hasDismissedPostCommentViewController(controller: PostCommentViewController) {
    //Update
}

这篇关于如何在 SWIFT 中重绘我的视图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！