UIReferenceLibraryViewController无法显示为弹出窗口(始终覆盖全屏)

问题描述

以下Swift 3代码(贷记到使用Swift破解)创建一个UIAlertController，并通过 UIPopoverPresentationController API:

The following Swift 3 code (credit to Hacking With Swift) creates a UIAlertController and successfully presents it as a popup from a CGRect co-ordinate on iPad, via the UIPopoverPresentationController API:

func popUpToSelectTheLanguage(){
    let ac = UIAlertController(title: "Set expected language...", message: nil, preferredStyle: .actionSheet)
    ac.addAction(UIAlertAction(title: "English", style: .default, handler: { (action) in /* Action to take */ }))
    ac.addAction(UIAlertAction(title: "French", style: .default, handler: { (action) in /* Action to take */ }))
    ac.addAction(UIAlertAction(title: "Cancel", style: .cancel))

    let popover = ac.popoverPresentationController
    popover?.sourceView = view
    popover?.sourceRect = CGRect(x: 32, y: 32, width: 64, height: 64)
    present(ac, animated: true)
}

但是，当尝试显示其他UIViewController作为弹出窗口时， UIReferenceLibraryViewController (系统的单/双语言词典)，它覆盖了整个屏幕，而不是显示为弹出窗口.

However, when trying to present a different UIViewController as a popup, UIReferenceLibraryViewController (the system's mono/bi-lingual dictionary), it covers the whole screen rather than appearing as a popup.

func popUpTheDictionary(){
    let dic = UIReferenceLibraryViewController(term: "hi" as String)

    let popover = dic.popoverPresentationController
    popover?.sourceView = view
    popover?.sourceRect = CGRect(x: 32, y: 32, width: 64, height: 64)
    present(dic, animated: true)
}

这是什么问题?是否需要进一步设置UIReferenceLibraryViewController，还是只是将其锁定为不显示为弹出窗口?

What's the problem here? Is further setup of the UIReferenceLibraryViewController required, or is it simply locked against being presented as a popup?

我的目标是iOS 10.2(通用)； iPad Pro(12.9英寸)的外壳.

My target is iOS 10.2, Universal; building for iPad Pro (12.9 inch).

如果没有办法解决此问题，我将同样接受任何提供通过另一个库将UIReferenceLibraryViewController作为弹出窗口呈现的代码的答案(如果在iPhone和iPad上作为弹出窗口使用，则需要加分) ).

If there is no way to solve this, I would equally accept any answer that provides the code needed to present the UIReferenceLibraryViewController as a popover via another library (bonus points if it works as a popover on iPhone as well as iPad).

推荐答案

您需要将视图控制器的modalPresentationStyle设置为.popover.

You need to set the view controller's modalPresentationStyle to .popover.

func popUpTheDictionary(){
    let dic = UIReferenceLibraryViewController(term: "hi" as String)
    dic.modalPresentationStyle = .popover // add this

    let popover = dic.popoverPresentationController
    popover?.sourceView = view
    popover?.sourceRect = CGRect(x: 32, y: 32, width: 64, height: 64)
    present(dic, animated: true)
}

UIAlertController为您执行此操作，因为它始终是弹出窗口.

UIAlertController does this for you since it is always a popover.

这篇关于UIReferenceLibraryViewController无法显示为弹出窗口(始终覆盖全屏)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！