Angular+ionic实现折叠展开效果

1，html中

<ion-item>
<div class="middle-content-order">
<div class="middle-order-icon">
<ion-icon name="chevron-up-outline" class="up-gray" item-right *ngIf="!isShow" (click)="isShow=!isShow">
</ion-icon>
<ion-icon name="chevron-down-outline" class="down-gray" item-right *ngIf="isShow" (click)="isShow=!isShow">
</ion-icon>
</div>
<div class="middle-order-title"><span>复印纸</span></div>
<div class="middle-order-null"></div>
<div class="middle-order-detail"><span>查看全部</span></div>
</div>
</ion-item>
<ion-list *ngIf="!isShow">
<div class="order-alert">
<div class='item-small'>
<span> A3复印纸</span>
</div>
<div class='item-small'>
<span> A3复印纸</span>
</div>
<div class='item-small'>
<span> A3复印纸</span>
</div>

<div class='item-small'>
<span> A3复印纸</span>
</div>
<div class='item-small'>
<span> A3复印纸</span>
</div>
<div class='item-small'>
<span> A3复印纸</span>
</div>

</div>
</ion-list>

2，参考
模拟下拉 展开/收缩

3，效果图