问题现象
使用Tabs组件，如何实现当前显示页签为1的页面内容，点击某个页签使用router跳转到其他页面再返回时，显示的依然是页签为1的页面内容？
效果预览
点击放大
背景知识
onPageShow：页面每次显示时触发一次，包括路由过程、应用进入前台等场景，仅@Entry装饰的自定义组件作为页面时生效。
Tabs：通过页签进行内容视图切换的容器组件，每个页签对应一个内容视图。
getRouter().pushUrl()：跳转到应用内的指定页面，通过Promise获取跳转异常的返回结果。
解决方案
@Entry修饰的页面在显示时会触发onPageShow生命周期回调，可以在此回调中设置页面显示的初始状态，Tabs组件显示具体哪个页面由Tabs内的currentIndex参数决定的，当页面返回时在onPageShow()方法内重设currentIndex的值使其显示对应页面。运行下述示例需要自行创建一个简单的PageA页面。
class TabBar {
title: string;
index: number;
constructor(title: string, index: number) {
this.title = title;
this.index = index;
}
}
@Entry
@Component
struct TabsTestPage {
uiContext = this.getUIContext();
// 当前选中Tabs的索引
@State currentIndex: number = 1;
// 判断Tabs是否选中（用于自定义Tabs列表的选中状态）
@State selectedIndex: number = 0;
private tabsController: TabsController = new TabsController();
private tabBars: TabBar[] = [
new TabBar('翻译机', 0),
new TabBar('首页', 1),
new TabBar('推荐', 2),
];
// 页面显示时初始化状态
onPageShow(): void {
this.currentIndex = 1;
}
// 自定义Tabs组件构建函数
@Builder
TabBuilder() {
List() {
ForEach(this.tabBars, (item: TabBar, index: number) => {
ListItem() {
Column() {
Text(item.title) // 根据选中状态改变文字颜色
.fontColor(this.currentIndex === item.index ? '#0A59F7' : Color.Black)
.fontSize(20)
.align(Alignment.Center);
}
.justifyContent(FlexAlign.Center)
.alignItems(HorizontalAlign.Start)
.margin({ left: 10 })
.onClick(() => {
// 更新Tabs组件的选中状态
this.currentIndex = index;
});
}.height(100);
});
}.height(100)
.listDirection(Axis.Horizontal)
.scrollBar(BarState.Off);
}
build() {
Column() {
Flex({ alignItems: ItemAlign.Center }) {
this.TabBuilder();
}.width('100%').height(100);
Tabs({ barPosition: BarPosition.Start, index: this.currentIndex, controller: this.tabsController }) {
TabContent() {
Text('翻译机的内容')
.fontSize(30)
.onClick(() => {
let promptShow = this.uiContext.getPromptAction();
promptShow.showToast({
message: '翻译机跳转'
});
// 需要自行创建一个PageA的@Entry页面
this.uiContext.getRouter().pushUrl({ url: 'pages/PageA' });
});
};
TabContent() {
Text('首页的内容')
.fontSize(30);
};
TabContent() {
Text('推荐的内容')
.fontSize(30);
};
}.barHeight(0)
.onAnimationStart((targetIndex: number) => {
this.currentIndex = targetIndex;
})
.onChange((index: number) => {
// currentIndex控制TabContent显示页签
this.currentIndex = index;
this.selectedIndex = index;
});
}.height('100%').width('100%'); }
}
总结
单例模式跳转时，由于也是复用路由栈内已有的页面实例，也可在本方案所述的页面生命周期内实现。
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