Angular 使用NativeScript+；递归导航到具有历史记录的相同组件；带ActionBar后退按钮的角度？

我正在使用Nativescript+Angular实现一个文件浏览器组件

NativeScript 5.2.0-2019-01-18-12822
nativescript-angular 7.1.0

我有一个带有路径参数和目录视图组件的路由，当用户点击文件系统层次结构时，会递归调用该路由

路线入口：

{ path: "debugfilebrowserdir/:path", component: DebugFileBrowserPageComponent } 

我正在使用observable模式订阅ngOnInit（）中ActivatedRoute上的paramMap：

这就像一个冠军。我可以点击目录条目并更新视图

我在操作栏中有后退按钮：

<ActionBar class="action-bar" title="Files">
  <NavigationButton android.systemIcon="ic_menu_back" text="Back" (tap)="goBack()"></NavigationButton>
</ActionBar>  

---

您要做的是使用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AppModule中，您希望将其作为提供程序

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 { }

下面是play.nativescript.org中的一个示例


（这不是我做的，我只是在传递我学到的信息。）

此外，如果您只希望某些页面重用路由策略，则需要对代码进行其他更改

 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，这样您就可以在默认的“shouldReuse”之外进行额外的检查

希望这有帮助
 谢谢你。
 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;
}