鸿蒙-下拉刷新控件PullToRefresh使用

DevEco Studio 版本:DevEco Studio NEXT Developer Preview2
HarmonyOS API 版本:4.1.0(11)
PullToRefresh 版本:"@ohos/pulltorefresh": "2.0.5"

下拉刷新控件 PullToRefresh 使用

  • 支持自定义 header,footer
  • 没有更多了布局

具体代码如下:

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import { HomeVM } from '../vm/HomeVM';
import { PullToRefresh } from '@ohos/pulltorefresh';

@Component
export struct ListAreaComponent {
@State data?: ListDataWrapper[] | null = null
private vm: HomeVM = new HomeVM()
// 需绑定列表或宫格组件
private scroller: Scroller = new Scroller();

aboutToAppear(): void {
// request data.
this.vm.requestData().then((data: ListDataWrapper[]) => {
this.data = data;
})
}

build() {
PullToRefresh({
// 必传项,列表组件所绑定的数据
data: this.data,
// 必传项,需绑定传入主体布局内的列表或宫格组件
scroller: this.scroller,
// 必传项,自定义主体布局,内部有列表或宫格组件
customList: () => {
// 一个用@Builder修饰过的UI方法
this.getListView()
},
// 可选项,下拉刷新回调
onRefresh: () => {
return new Promise<string>((resolve) => {
this.vm.requestData().then((data: ListDataWrapper[]) => {
this.data = data
resolve('')
}).catch((error: Error) => {
resolve('')
});
});
},
// 可选项,上拉加载更多回调
onLoadMore: () => {
return new Promise<string>((resolve) => {
resolve('')
});
},
customLoad: commonNoMore,
customRefresh: commonLoading,
})
.width('100%')
.height('100%')
}

@Builder
getListView() {
List({ space: 12, scroller: this.scroller }) {
ForEach(this.data, (item: ListDataWrapper, index: number) => {
ListItem() {
// ...
};
}, (item: ListDataWrapper, index?: number) => index + JSON.stringify(item));
}
.width('100%')
.height('100%')
.scrollBar(BarState.Off)
.edgeEffect(EdgeEffect.None)
}
}


@Builder
export function commonLoading(): void {
Stack() {
// Text(refreshText)
// .textAlign(TextAlign.Center)
// .fontColor( 0)
// .fontSize( 0)
Stack() {
Canvas(new CanvasRenderingContext2D(new RenderingContextSettings(true)))
.width('100%')
.height('100%')
.onReady(() => {
// this.initCanvas();
}) // .visibility(this.state == IS_PULL_DOWN_2 ? Visibility.Visible : Visibility.Hidden)
// .visibility(Visibility.Hidden)
LoadingProgress()
.color('#FF00A3FF')
.width(32)
.height(32)
}
.width('100%')
.height('100%')
}
.width('100%')
.height('100%')
.clip(true)
}

@Builder
export function commonNoMore(): void {
Stack() {
Text('已经到底了~')
.textAlign(TextAlign.Center)
.fontColor('#FF85888F')
.fontSize(14)
}
.width('100%')
.height('100%')
.clip(true)
}

@Builder
export function commonEmpty(): void {
Stack()
.width('100%')
.height('100%')
}

注意,列表组件需要设置为无边缘效果:List().edgeEffect(EdgeEffect.None)

参考

https://ohpm.openharmony.cn/#/cn/detail/@ohos%2Fpulltorefresh

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