答题时 物理键返回 判断

src/app/app.module.ts

@@ -33,6 +33,8 @@ import {LoginService} from "../pages/login/login.service";
 import {LearnManageService} from "../pages/home/learn-manage/learnManage.service";
 import {CommonService} from "../service/common.service";
 import {TabsService} from "../pages/tabs/tabs.service";
+import {BackButtonService} from "../service/backButton.service";
+import {EmitService} from "../service/emit.service";
 
 @NgModule({
     declarations: [
@@ -92,6 +94,8 @@ import {TabsService} from "../pages/tabs/tabs.service";
         LoginService,
         CommonService,
         TabsService,
+        BackButtonService,
+        EmitService,
         {provide: ErrorHandler, useClass: IonicErrorHandler}
     ]
 })

src/pages/home/learning/learning-do/learning-do.ts

-import {Component, ViewChild} from '@angular/core';
+import {Component, EventEmitter, Output, ViewChild} from '@angular/core';
 import {IonicPage, Nav, Navbar, NavController, NavParams, Slides, ToastController} from 'ionic-angular';
 import {message} from "../../../../app/main";
 import {AppGlobal, AppService} from "../../../../service/appHttpService";
@@ -7,6 +7,7 @@ import {LearnService} from "../learn.service";
 import {DatePipe} from "@angular/common";
 import {CommonService} from "../../../../service/common.service";
 import {ReviewResultPage} from "../review-result/review-result";
+import {EmitService} from "../../../../service/emit.service";
 
 @IonicPage()
 @Component({
@@ -15,8 +16,7 @@ import {ReviewResultPage} from "../review-result/review-result";
 })
 export class LearningDoPage {
     @ViewChild(Slides) slides: Slides;
-    @ViewChild(Navbar) navbar: Navbar;
-    @ViewChild(Nav) nav:Nav;
+    @ViewChild(Navbar) navbar:Navbar;
 
     type;   //是否重做
     title;  // 问卷标题
@@ -29,10 +29,12 @@ export class LearningDoPage {
     index = 0;  //当前题目的序号
     useTime = 0;  //用时
     constructor(public navCtrl: NavController, public navParams: NavParams, private learnSer: LearnService, public commonSer: CommonService,
-                public toastCtrl: ToastController, public appService: AppService, public datePipe: DatePipe) {
+                public toastCtrl: ToastController, public appService: AppService, public datePipe: DatePipe,public eventEmitSer:EmitService,
+                private nav:Nav) {
     }
 
     ionViewDidLoad() {
+        this.eventEmitSer.eventEmit.emit('true');
         this.navbar.backButtonClick = () => {
             this.commonSer.alert("是否退出当前测试，中途退出直接交卷？", (res)=>{
                 this.submit()
@@ -41,7 +43,7 @@ export class LearningDoPage {
     }
 
     ionViewDidEnter() {
-        this.nav.swipeBackEnabled = false;
+        // this.nav.swipeBackEnabled = false;
         this.testId = this.navParams.get('testId');
         this.title = this.navParams.get('title');
         this.type = this.navParams.get('type');
@@ -184,6 +186,7 @@ export class LearningDoPage {
                         title: this.title
                     })
                 }
+                this.eventEmitSer.eventEmit.emit('false');
             }
         )
 

src/pages/home/learning/learning-result/learning-result.ts

 import {Component, ViewChild} from '@angular/core';
-import {IonicPage, Navbar, NavController, NavParams} from 'ionic-angular';
+import {IonicPage, Nav, Navbar, NavController, NavParams} from 'ionic-angular';
 import {ReviewLearnPage} from "../review-learn/review-learn";
 import {LearnService} from "../learn.service";
 
@@ -24,6 +24,7 @@ export class LearningResultPage {
                 public learnSer:LearnService) {
     }
 
+
     ionViewDidLoad() {
         this.testId = this.navParams.get('testId');
         this.title = this.navParams.get('title');

src/pages/tabs/tabs.ts

 import { Component, Renderer, ElementRef, ViewChild } from '@angular/core';
-import {NavParams, NavController, AlertController, Events, Tabs} from 'ionic-angular';
+import {NavParams, NavController, AlertController, Events, Tabs, Platform} from 'ionic-angular';
 
 import { ContactPage } from './contact/contact';
 import { HomePage } from './home/home';
 import { MinePage } from './mine/mine';
 
 import { Storage } from '@ionic/storage';
-
-import { ModifyPasswordPage } from '../mine/person/modifyPassword/modifyPassword';
 import { AppService, AppGlobal } from '../../service/appHttpService';
 import {NoticePage} from "./notice/notice";
+import {BackButtonService} from "../../service/backButton.service";
 
 @Component({
   templateUrl: 'tabs.html'
@@ -34,7 +33,9 @@ export class TabsPage {
     public event: Events,
     public render: Renderer,
     public elementRef: ElementRef,
-    public appService: AppService
+    public appService: AppService,
+    private backButtonService:BackButtonService,
+    public platform:Platform,
   ) {
     this.tabRoots = [{
       root: HomePage,
@@ -62,6 +63,10 @@ export class TabsPage {
         index:3
     }];
 
+      this.platform.ready().then(() => {
+          this.backButtonService.registerBackButtonAction(this.myTabs);
+      });
+
     //判断是否密码为初始六个0
     // this.userInfo = this.storage.get("userLoginInfo").then((value) => {
     //   this.userInfo = value;

src/service/appHttpService.ts

@@ -14,8 +14,8 @@ export class AppGlobal {
 
     //接口基地址
     // static domain = "http://101.89.112.92:80";       //正式环境
-    // static domain = "http://180.168.156.212:2931";   //测试环境
-    static domain = "";   //本地环境
+    static domain = "http://180.168.156.212:2931";   //测试环境
+    // static domain = "";   //本地环境
 
 
     //图片地址

src/service/backButton.service.ts

+import {EventEmitter, Injectable} from '@angular/core';
+import { Platform, ToastController, App, NavController, Tabs } from 'ionic-angular';
+import {EmitService} from "./emit.service";
+
+@Injectable()
+export class BackButtonService {
+
+    //控制硬件返回按钮是否触发，默认false
+    backButtonPressed: boolean = false;
+
+    isDo = false;   //是否答题中，默认false；
+    //构造函数 依赖注入
+    constructor(public platform: Platform,
+                public appCtrl: App,public eventEmitSer:EmitService,
+                public toastCtrl: ToastController) {
+        // 接收发射过来的数据
+        this.eventEmitSer.eventEmit.subscribe((value: any) => {
+            if(value == "true") {  //答题中
+                this.isDo = true;
+            }else{   //答题结束
+                this.isDo = false;
+            }
+        });
+    }
+
+    //注册方法
+    registerBackButtonAction(tabRef: Tabs): void {
+
+        //registerBackButtonAction是系统自带的方法
+        this.platform.registerBackButtonAction(() => {
+            //获取NavController
+            let activeNav: NavController = this.appCtrl.getActiveNavs()[0];
+
+            //如果可以返回上一页，则执行pop
+            if (activeNav.canGoBack()) {
+                alert(this.isDo);
+               if(!this.isDo){
+                   activeNav.pop();
+               }
+            } else {
+                if (tabRef == null || tabRef._selectHistory[tabRef._selectHistory.length - 1] === tabRef.getByIndex(0).id) {
+                    //执行退出
+                    // this.showExit();
+                } else {
+                    //选择首页第一个的标签
+                    tabRef.select(0);
+                }
+            }
+        });
+    }
+
+    //退出应用方法
+    private showExit(): void {
+        //如果为true，退出
+        if (this.backButtonPressed) {
+            this.platform.exitApp();
+        } else {
+            //第一次按，弹出Toast
+            this.toastCtrl.create({
+                message: '再按一次退出应用',
+                duration: 2000,
+                position: 'top'
+            }).present();
+            //标记为true
+            this.backButtonPressed = true;
+            //两秒后标记为false，如果退出的话，就不会执行了
+            setTimeout(() => this.backButtonPressed = false, 2000);
+        }
+    }
+}
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src/service/emit.service.ts

+import {Injectable, EventEmitter, OnInit} from "@angular/core";
+@Injectable()
+export class EmitService implements OnInit {
+    public eventEmit: any;
+
+    constructor() {
+        // 定义发射事件
+        this.eventEmit = new EventEmitter();
+    }
+
+    ngOnInit() {
+
+    }
+}
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