Swift 如何使文本视图支持OSX中的字典服务

我想在我的应用程序中使用苹果的字典服务。测试代码如下所示。它可以得到这个词的解释，问题是： 1.如何获得func dcsgetterRangeinstring中的偏移量，我在代码中设置为7 2.如何让文本视图响应键盘事件cmd+ctrl+d

//
//  ContentView.swift
//  testTextClick
//
//  Created by lezi on 2020/6/2.
//  Copyright © 2020 lezi. All rights reserved.
//

import SwiftUI
import Foundation
import AppKit
import CoreServices.DictionaryServices

struct ContentView: View {
    let txt = "hello world"
    var body: some View {

        VStack{

            Text(txt)
                .contextMenu(){
                    Button("search xxx"){
                       let range = DCSGetTermRangeInString(nil, self.txt as CFString, 7)
                        let str = DCSCopyTextDefinition(nil,self.txt as CFString ,range)
                        print(str)
                    }
            }

        }
            .frame(maxWidth:.infinity,maxHeight: .infinity)



    }


}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

---

NSTextView公开了更多的函数来完成这项工作

override func mouseDown(with event: NSEvent) {


    let location = event.locationInWindow
    let point3 = self.window?.convertPoint(toScreen: location)
    let idx = self.characterIndex(for: point3!)
    let range = DCSGetTermRangeInString(nil, self.string as CFString, idx)
   super.mouseDown(with: event)

}

---

NSTextView公开了更多的函数来完成这项工作

override func mouseDown(with event: NSEvent) {


    let location = event.locationInWindow
    let point3 = self.window?.convertPoint(toScreen: location)
    let idx = self.characterIndex(for: point3!)
    let range = DCSGetTermRangeInString(nil, self.string as CFString, idx)
   super.mouseDown(with: event)

}