为*ngFor中的开放模式生成唯一的变量名

Question

我想在*ngFor中生成唯一的变量share，这样我就可以打开单模了。

<li *ngFor="let gallery of galleries; let i = index">
  <div class="gallery card" >                        
        <div class="share-fab" (click)="share = !share" [class.open]="share">
           <div class="option email" [class.open]="share"><i class="material-icons">email</i></div>
           <div class="option download" [class.open]="share"><i class="material-icons">file_download</i></div>
           <div class="option facebook" [class.open]="share"><i class="material-icons">whatshot</i></div>
           <div class="option twitter" [class.open]="share"><i class="material-icons">notifications_none</i></div>
           <div class="close" [class.open]="share"><i class="material-icons cross">close</i></div>
        </div>
     </div>
   </div>
</li>

我很感谢你们的帮助。