我对“历史回顾"有疑问当导航到同一页面时 [英] I have an issue with "history back" when navigate to same page

问题描述

当我导航到同一个组件(使用 nativescript angular)时，我可以拦截参数更改，但是当我点击 Android 后退按钮时，它不会返回上一页.

When I navigate to the same component (with nativescript angular), I can intercept the params change but when i tap the Android Back button, it doesn't return back to previous page.

constructor(private pageRoute: PageRoute) {
    super();
    this.pageRoute.activatedRoute
        .switchMap(activatedRoute => activatedRoute.params)
        .forEach((params) => { 
            this._groupId = params['id'];
            this.load(); // this method reload the list in the page.
        });
}

我在同一页面group/:id"中导航，使用不同的urlhome"->group/1"->group/2"->group/3".如果我单击group/3"中的 Android Back Button，我将返回home".

I navigate in the same page "group/:id" with different url "home" -> "group/1" -> "group/2" -> "group/3". If I click Android Back Button in "group/3", I return to "home".

我可以在应用历史记录中添加新页面"吗?

Can I add the "new page" in the application history?

谢谢

推荐答案

你想做的是使用 CustomRouteReuseStrategy

What you want to do is use a CustomRouteReuseStrategy

import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot } from '@angular/router';
import { NSLocationStrategy } from 'nativescript-angular/router/ns-location-strategy';
import { NSRouteReuseStrategy } from 'nativescript-angular/router/ns-route-reuse-strategy';

@Injectable()
export class CustomRouteReuseStrategy extends NSRouteReuseStrategy {

     constructor(location: NSLocationStrategy) {
         super(location);
     }

     shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
         return false;
     }
}

在你的 AppModule 中，你想把它作为提供者

and inside your AppModule you want to put this as a provider

import { NgModule, NgModuleFactoryLoader, NO_ERRORS_SCHEMA } from "@angular/core";
import { RouteReuseStrategy } from "@angular/router";
import { NativeScriptModule } from "nativescript-angular/nativescript.module";

import { AppRoutingModule } from "./app-routing.module";
import { CustomRouteReuseStrategy } from "./custom-router-strategy";
import { AppComponent } from "./app.component";

@NgModule({
    bootstrap: [
        AppComponent
    ],
    imports: [
        NativeScriptModule,
        AppRoutingModule
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        {
            provide: RouteReuseStrategy,
            useClass: CustomRouteReuseStrategy
        }
    ],
    schemas: [
        NO_ERRORS_SCHEMA
    ]
})
export class AppModule { }

这是 play.nativescript.org 中的一个例子

here is a example in play.nativescript.org

https://play.nativescript.org/?template=play-ng&id=AspHuI

(我没有做这个，我只是传递我学到的信息.)

(I didn't make this, I am just passing on the info that I have learned.)

此外，如果您只希望某些页面重用路由策略，则需要对代码进行额外更改

Also, if you only want certain pages to reuse the route strategy then you would need to make additional changes of code

 shouldReuseRoute(future: ActivatedRouteSnapshot, current: ActivatedRouteSnapshot): boolean {
// first use the global Reuse Strategy evaluation function,
// which will return true, when we are navigating from the same component to itself
let shouldReuse = super.shouldReuseRoute(future, current);

// then check if the noReuse flag is set to true
if (shouldReuse && current.data.noReuse) {
  // if true, then don't reuse this component
  shouldReuse = false;
}

然后您可以将 noReuse 作为路由参数传递，以便您在默认的shouldReuse"之外进行额外的检查

and then you could pass noReuse as a route param so that you have an additional check beyond the default "shouldReuse"

希望这有帮助！

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