如何在iOS 9中检测弹出窗口何时被解除 [英] How to detect when a popover is dismissed in iOS 9

问题描述

我正在更新应用以使用通用故事板。我已经使用界面构建器创建了一个popover segue到一个新的viewcontroller，方法是从一个按钮拖动到我的新viewcontroller并选择'Present As Popover'作为segue的类型。

I'm updating an app to use universal storyboards. I've created a popover segue to a new viewcontroller using interface builder by dragging from a button to my new viewcontroller and selecting 'Present As Popover' as the kind of segue.

当用户按下弹出窗口（解除它）时，我需要在呈现视图控制器中得到通知，以便我可以撤消他们的操作。我该怎么做？

When the user presses outside of the popover (dismissing it) I need to be notified in the presenting view controller so I can undo their actions. How can I do this?

通常我会手动创建popover并使我的viewcontroller成为popover的委托;允许我使用popoverControllerDidDismissPopover委托回调。但是，这在iOS9中已被弃用，即使不是我也不知道在哪里找到popover所以我可以将其委托设置为我的视图控制器。

Normally I would have created the popover manually and made my viewcontroller the popover's delegate; allowing me to use the popoverControllerDidDismissPopover delegate call back. However, this is deprecated in iOS9 and even if it wasn't I've no idea where to find the popover so I can set its delegate to my view controller.

推荐答案

不确定您所指的哪种方法已被弃用，但您仍然可以使用 UIPopoverPresentationControllerDelegate 来实现此目的。类似于：

Not sure which method you're referring to as being deprecated but you can still use the UIPopoverPresentationControllerDelegate to achieve this. Something like:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "popoverSegue" {
        let vc = segue.destinationViewController
        sortVC.modalPresentationStyle = .Popover
        sortVC.popoverPresentationController?.sourceRect = filterButton.bounds
        sortVC.preferredContentSize = CGSizeMake(216, 150)
        sortVC.popoverPresentationController!.delegate = self
    }
}

然后使用

func popoverPresentationControllerDidDismissPopover(popoverPresentationController: UIPopoverPresentationController)

处理解雇的方法。

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