示例代码:

import Foundation
import CoreServices.DictionaryServices

func define(_ word: String) -> String? {
    let nsstring = word as NSString
    let cfrange = CFRange(location: 0, length: nsstring.length)

    guard let definition = DCSCopyTextDefinition(nil, nsstring, cfrange) else {
        return nil
    }

    return String(definition.takeUnretainedValue())
}

define("apple") // "apple | ˈapəl | noun 1 the round fruit of a tree..."

Apple's documentation 但是对于如何实现和使用它却没有任何解释。

解决方案:

感谢下面回答我问题的人,我做了一些研究,找到了解决办法。显然,我可以通过调用 UIReferenceLibraryViewController ,但苹果的文档说,我们不应该使用这个制作字典的应用程序。显然,仅仅制作一个字典应用程序是不够的,因为它使用自己的字典应用程序 ViewController 不可自定义。

 let dic = UIReferenceLibraryViewController(term: textLabelOutlet.text 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)

资料来源: UIReferenceLibraryViewController cannot be presented as popup (always covers full screen)