如何获取文本框里的文字宽度

import { MeasureText } from '@kit.ArkUI'; 
 
@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World' 
  @State textWidth: number = MeasureText.measureText({ 
    textContent: "Hello word", 
    fontSize: '50px' 
  }) 
 
  build() { 
    Row() { 
      Column() { 
        Text("The width of 'Hello World': " + this.textWidth) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}