列表顺序更改后，Ionic virtualScroll不会刷新

Question

当我在构造函数中对列表进行排序时，使用Ionic3和virtualScroll工作正常，但是当我在页面上使用排序按钮更改列表的排序顺序时，排序已完成，但列表未刷新。我见过virtualTrackBy，但我不确定这是我需要的，因为我的数组真的在变化。在重新排序之后，如何确保列表刷新？

constructor() {
  this.users = this.getUsers();
  this.usersSort("FirstName", "(A-Z)"); //Initial state
}
usersSort(key: string, order: string) {
  //sort according to key and order
}
configureItem(item: User) {
  //display item as "FirstName LastName" or "LastName, FirstName"
}
selectFirst() {
  var currentSegment = document.getElementById("segFirst");
  var sortOrder;
  if (this.segSelected === "FirstName") {
    //was already selected --> change sort order
    var currentValue = currentSegment.innerText;
    sortOrder = currentValue.substr(currentValue.length - 5); // (A-Z) or (Z-A)
  } else {
    //newly selected
    document.getElementById("segLast").innerText = "LastName"; //reset other segment
    this.segSelected = 'FirstName';
    sortOrder = "(A-Z)"; // (A-Z) or (Z-A)
  }
  var sortKey = this.segSelected; // FirstName or LastName
  var newOrder = (sortOrder === "(A-Z)") ? "(Z-A)" : "(A-Z)";
  this.usersSort(sortKey, sortOrder);
  var newValue = sortKey + " " + newOrder;
  currentSegment.innerText = newValue;
}

<div class="fixed-header my-segment">
  <ion-segment [(ngModel)]="segSelected" (ionChange)="changeSegment()">
    <ion-segment-button id="segFirst" value="FirstName" (ionSelect)="selectFirst()">FirstName (Z-A)</ion-segment-button>
    <ion-segment-button id="segLast" value="LastName" (ionSelect)="selectLast()">LastName </ion-segment-button>
  </ion-segment>
</div>
<ion-content class="ion-content-below-my-segment">
  <ion-list [virtualScroll]="users">
    <button ion-item *virtualItem="let item" (click)="itemSelected(item)">
        {{configureItem(item)}}
      </button>
  </ion-list>
</ion-content>

完整的代码可以找到：https://stackblitz.com/edit/ionic-list100k-segment-index

Answer 1

离子3.5.2存在问题。用离子3.9.2固定。