小编And*_*mba的帖子

单击手风琴时，我在将 V 形符号从 UP 更改为 DOWN 时遇到问题。无论我尝试过什么技巧，甚至尝试过其他类似https://stackblitz.com/edit/ngx-bootstrap-ifmpph?file=app%2Fapp.component.html 的示例，它似乎总是结果为真

        <accordion [closeOthers]="true">
                <accordion-group #group [isOpen]='true'>
                    <div accordion-heading class="clearfix">
                        Basic Information
                        <span class="badge badge-secondary float-right pull-right">
                            <i class="fa" [ngClass]="!group?.isOpen ? 'fa-chevron-down': 'fa-chevron-down'"></i>
                        </span>
                    </div>
                </accordion-group>
            </accordion>