我在 nativescript 中使用 Teleriks RadListView 的 TKListViewHeaderDirective，如下所示：
<GridLayout columns="*" rows="*" tkToggleNavButton>
<RadListView *ngIf="!loading" row="3" col="0" [items]="nodes" ...>
<ng-template tkListItemTemplate let-node="item">
<!-- list item -->
</ng-template>
<ng-template tkListViewHeader>
<GridLayout columns="*" rows="auto, auto, auto">
<GridLayout row="0" col="0" columns="40,*,40">
<Button class="fa action-item" row="0" col="0" [text]="'fa-sort-amount-asc' | fonticon" ios.position="right" android="actionBar" style="background-color:#c9c9ce;;"></Button>
<SearchBar row="0" col="1" #searchInput hint="Search" (submit)="search(searchInput.text)" (clear)="search('')" (textChange)="search(searchInput.text)"></SearchBar>
<Button class="fa action-item" row="0" col="2" [text]="'fa-th' | fonticon" ios.position="right" android="actionBar" style="background-color:#c9c9ce;"></Button>
</GridLayout>
<StackLayout row="1" col="0">
<Label text="Hello world"></Label>
<Label [text]="currentNode.name"></Label>
<Label [text]="nodes?.length ? nodes.length : 0"></Label>
</StackLayout>
<StackLayout row="2" col="0" *ngIf="!nodes?.length" class="list-group">
<!-- some contents -->
</StackLayout>
<StackLayout row="3" col="0" *ngIf="currentNode?.name !== '/'" class="list-group">
<!-- some contents -->
</StackLayout>
</GridLayout>
</ng-template>
</RadListView>
</GridLayout>
这里似乎有两件事出了问题：
this这里似乎缺少（*ngIf 应该在特定情况下显示 StackLayouts 之一，但不- 列表标题内的 GridLayout（如果我将其更改为 StackLayout 则没有任何效果）仅显示一个子元素
根据文档：http ://docs.telerik.com/devtools/nativescript-ui/Controls/Angular/ListView/header-footer