HarmonyOS textInput 如何清空输入框

demo例子:

struct Index {
  @State text: string = 'Hello World'
  controller: TextInputController = new TextInputController()

  build() {
    Row() {
      Column() {
        TextInput({ placeholder: 'Please input your words.', text: this.text, controller: this.controller })
          .onChange((value) => {
            this.text = value
          })
        Button("Clear TextInput").onClick(() => {
          this.text = "";
        })
      }.width('100%')
    }.height('100%')
  }
}