HarmonyOS TextInput输入的时候，当文字达到一定数量的时候，自动关闭输入框？

Question

如题：HarmonyOS TextInput输入的时候，当文字达到一定数量的时候，自动关闭输入框？

Answer 1

设置TextInput输入字符数量达到设定长度时自动关闭demo

@Entry
@Component
struct FirstTest {
  @State message1: string = 'Hello World';
  private controller:TextInputController = new TextInputController();

  build() {
    Column() {
      Text("FirstTest：" + this.message1)
        .fontSize(25)
        .fontWeight(FontWeight.Bold)

      TextInput({placeholder:'Waiting for input',text:$$this.message1,controller:this.controller})
        .fontSize(25)
        .fontWeight(FontWeight.Bold)
        .onChange(()=>{
          if(this.message1.length >= 20){
            this.controller.stopEditing()
          }
        })

    }
  }
}