HarmonyOS 软键盘弹出控制与检测

可以通过focusControl.requestFocus控制输入框获焦，组件获焦后会自动弹起软键盘；

可以通过输入法服务InputMethodController的stopInputSession接口，然后来控制是否收起键盘；

简单的demo，点击按钮收起键盘：

import { BusinessError } from '@ohos.base';
import inputMethod from '@ohos.inputMethod';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  @State value: string = "";

  stopInputSession () {
    let inputMethodController = inputMethod.getController();
    try {
      inputMethodController.stopInputSession((err: BusinessError, result: boolean) => {
        if (err) {
          console.error(`Failed to stopInputSession: ${JSON.stringify(err)}`);
          return;
        }
        if (result) {
          console.log('Succeeded in stopping inputSession.');
        } else {
          console.error('Failed to stopInputSession.');
        }
      });
    } catch(err) {
      console.error(`Failed to stopInputSession: ${JSON.stringify(err)}`);
    }
  }

  build() {
    Column() {
      Column() {
        TextInput({placeholder:this.message})
          .fontSize(30)
          .height("10%")
          .fontWeight(FontWeight.Bold)
          .focusOnTouch(true)

        Button("StopInputSession")
          .width("60%")
          .height("10%")
          .onClick(() => {
            this.stopInputSession();
          })
      }
    }
    .height('100%')
    .justifyContent(FlexAlign.SpaceBetween)
  }
}