HarmonyOS 代码是弹窗中的TextArea组件，在onAppear的时候获取焦点，有概率获取到焦点但是输入法未弹出

参考示例如下：

focusControl.requestFocus("live_comment_text_input");
try {
  let textConfig: inputMethod.TextConfig = {
    inputAttribute: {
      textInputType: 0,
      enterKeyType: 1
    }
  };
  let inputMethodController = inputMethod.getController()
  inputMethodController.attach(true, textConfig).then(() => {
    console.log('Succeeded in attaching inputMethod.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to attach: ${JSON.stringify(err)}`);
  })
} catch (err) {
  console.error(`Failed to attach: ${JSON.stringify(err)}`);
}
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