HarmonyOS TextInput如何主动唤起编辑状态

参考示例：

import { inputMethod } from '@kit.IMEKit';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  @State positionInfo: CaretOffset = { index: 0, x: 0, y: 0 }
  controller: TextInputController = new TextInputController()
  @State isShow: boolean = false
  build() {
    Column() {
      Button('显示')
        .margin({ top: 60 })
        .onClick(() => {
          this.isShow = true
        })
      if (this.isShow) {
        Column() {
          TextInput({ controller: this.controller })
            .id('123')
            .defaultFocus(true)
          Button('光标位置')
            .margin(15)
            .onClick(() => {
              this.positionInfo = this.controller.getCaretOffset()
              console.log(JSON.stringify(this.positionInfo.index))
            })
          Text(JSON.stringify(this.positionInfo.index))
          Button(`隐藏软键盘`)
            .key('button')
            .onClick(() => {
              inputMethod.getController().hideTextInput();
            })
          Button(`拉起软键盘`)
            .key('button')
            .onClick(() => {
              inputMethod.getController().showTextInput()
            })
        }
        .onAppear(() => {
          focusControl.requestFocus("123")
        })

      }
    }
  }
}