鸿蒙 navigation路由跳转，页面struct 下的生命周期、onShow、onHidden等不会触发问题

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经常用安卓思维考虑问题，用习惯了Router方式跳转，但是官方推荐用 navigation，当然它有它的有点， 也有小瑕疵，用了api11 后 发现 navigation路由跳转 ，只要被它包裹的跳转到下页面的，有些生命周期是拿不到的，比如onShow，onHidden等 ，估计小伙伴们也遇到了。庆幸的是api12 更新了，上面可以了哈，下面是以前的和现在的实例代码，对比就知道了哈

以前：

 @BuilderpageMap(name: string, param: object) {NavDestination() {// 根据模块名，获取WrappedBuilder对象，通过builder接口创建页面DfRouter.getBuilder(name).builder(param);}.hideTitleBar(true)}build() {Navigation(this.navPathStack) {Row() {Column() {Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)}.width('100%')}.height('100%')}.hideTitleBar(true).navBarWidth('50%').navDestination(this.pageMap).mode(NavigationMode.Auto)}
}

export class DfRouter {....省略代码/*** @param builderName* @param builder*/public static getBuilder(builderName: string): WrappedBuilder<[object]> {let builder = DfRouter.builderMap.get(builderName);return builder as WrappedBuilder<[object]>;}....省略代码
}

上面代码  根据模块名，获取WrappedBuilder对象，通过builder接口创建页面
      DfRouter.getBuilder(name).builder(param)   方法是返回了个一个WrapeedBudilder

注册页面路由原来是这样的

export default class DfAbilityStage extends AbilityStage{onCreate(): void {GlobalContext.getContext().setObject("appContext", this.context.getApplicationContext());this.initRouter();}/*** 将entry中所有页面一次性注册进来*/initRouter() {let navPathStack: NavPathStack = new NavPathStack()GlobalContext.getContext().setObject('entryPageStack', navPathStack);DfRouter.createNavPathStack(navPathStack);// 加载页面import('./pages/AdPage');import('./pages/HomePage');import('./pages/TestAPage');import('./webContainer/pages/WebPage');}}

  static readonly PAGE_AD: RouterInfo = new RouterInfo('entry', 'AdPage');static readonly PAGE_TEST: RouterInfo = new RouterInfo('entry', 'TestPage');

DfRouter.registerRouterPage(RouterInfo.PAGE_WEB, wrapBuilder(getWebPage));

而下面api12 更新了，变成了让人舒服的 理想状态，同时哪些生命周期也有了

// 该示例演示NavDestination的生命周期时序。
@Builder
export function PageOneBuilder(name: string, param: Object) {PageOneComponent()
}@Component
struct PageOneComponent {private stack: NavPathStack | null = null;@State eventStr: string = "";build() {NavDestination() {Column() {Text("event: " + this.eventStr)Button('pushPath', { stateEffect: true, type: ButtonType.Capsule }).width('80%').height(40).margin(20).onClick(() => {if (this.stack) {this.stack.pushPath({name: "pageOne"});}})Button('pop', { stateEffect: true, type: ButtonType.Capsule }).width('80%').height(40).margin(20).onClick(() => {this.stack?.pop()})}.width('100%').height('100%')}.title('pageOne').onAppear(() => { this.eventStr += "<onAppear>"; }).onDisAppear(() => { this.eventStr += "<onDisAppear>"; }).onShown(() => { this.eventStr += "<onShown>"; }).onHidden(() => { this.eventStr += "<onHidden>"; }).onWillAppear(() => { this.eventStr += "<onWillAppear>"; }).onWillDisappear(() => { this.eventStr += "<onWillDisappear>"; }).onWillShow(() => { this.eventStr += "<onWillShow>"; }).onWillHide(() => { this.eventStr += "<onWillHide>"; })// onReady会在onAppear之前调用.onReady((ctx: NavDestinationContext) => {try {this.eventStr += "<onReady>";this.stack = ctx.pathStack;} catch (e) {console.log(`testTag onReady catch exception: ${JSON.stringify(e)}`)}})}
}@Entry
@Component
struct NavigationExample3 {private stack : NavPathStack = new NavPathStack();build() {Navigation(this.stack) {Stack({alignContent: Alignment.Center}) {Button('pushPath', { stateEffect: true, type: ButtonType.Capsule }).width('80%').height(40).margin(20).onClick(() => {this.stack.pushPath({ name: "pageOne" })})}.width('100%').height('100%')}.width('100%').height('100%').title('Navigation')}
}

注册路由方式也改变了

// 工程配置文件module.json5中配置 {"routerMap": "$profile:route_map"}
// route_map.json
{"routerMap": [{"name": "pageOne","pageSourceFile": "src/main/ets/pages/Index.ets","buildFunction": "PageOneBuilder","data": {"description": "this is pageOne"}}
,{"name": "/modules/scan","pageSourceFile": "src/main/ets/pages/scan/ScanViewPage.ets","buildFunction": "getScanPage","data": {"description": "this is pageOne"}},]
}

版本api12 加了配置文件的映射表不再是动态的了

是不是看着舒服多了，详细内容看api12 文档哈，感觉有用记得点个赞，感谢了!!

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