ionic3 做双击退出应用的时候按照网上大神的来，从中遇到了一些问题，用this.app.getRootNav().push(MyPage);跳转的页面无法返回，this.app.getActiveNav().pop();这个方法在新的版本中已近被移除了，最后使用另外一种返回方式this.appCtrl.getRootNav().pop();
完整代码：
1.tabs.ts文件
import {Component, ViewChild} from '@angular/core';
import { AboutPage } from '../about/about';
import { ContactPage } from '../contact/contact';
import { HomePage } from '../home/home';
import { MyPage } from '../my/my';
import {Tabs} from "ionic-angular";
@Component({
templateUrl: 'tabs.html'
})
export class TabsPage {
tab1Root = HomePage;
tab2Root = AboutPage;
tab3Root = ContactPage;
tab4Root = MyPage;
@ViewChild('mainTabs') tabs:Tabs;
constructor() {
}
}
2.tabs.html文件
<ion-tabs #mainTabs> <ion-tab [root]="tab1Root" tabTitle="定位" tabIcon="ios-pin-outline" ></ion-tab> <ion-tab [root]="tab2Root" tabTitle="运输管理" tabIcon="ios-paper-outline"></ion-tab> <ion-tab [root]="tab3Root" tabTitle="账单管理" tabIcon="logo-yen"></ion-tab> <ion-tab [root]="tab4Root" tabTitle="我的" tabIcon="ios-contact-outline"></ion-tab> </ion-tabs>
3.app.component.ts文件
import {Component, ViewChild} from '@angular/core';
import {Nav, Platform, ToastController,App} from 'ionic-angular';
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';
import { Login } from '../pages/login/login';
import { TabsPage } from '../pages/tabs/tabs';
@Component({
templateUrl: 'app.html'
})
export class MyApp {
rootPage:any;
public backButtonPressed: boolean = false;
@ViewChild("myNav") nav: Nav;
constructor(public platform: Platform,statusBar: StatusBar, splashScreen: SplashScreen,
public toastCtrl: ToastController,public appCtrl:App) {
platform.ready().then(() => {
this.exitApp();
});
}
exitApp() {
this.platform.registerBackButtonAction(() => {
//控制modal、系统自带提示框
let overlay = this.appCtrl._appRoot._overlayPortal.getActive() || this.appCtrl._appRoot._modalPortal.getActive();
if (overlay) {
overlay.dismiss();
return;
}
let activeVC = this.nav.getActive();
let page = activeVC.instance;
if (page.tabs) {
let activeNav = page.tabs.getSelected();
if (activeNav.canGoBack()) {
return activeNav.pop();
} else {
return this.showExit();
}
}
if (page instanceof Login) {//查看当前页面是否是登陆页面
this.showExit();
return;
}
this.appCtrl.getRootNav().pop();//剩余的情况返回操作
});
}
//双击退出函数
showExit() {
if (this.backButtonPressed) {
this.platform.exitApp();
} else {
this.presentToast();//再按一次退出
this.backButtonPressed = true;
setTimeout(() => {
this.backButtonPressed = false;
}, 2000)
}
}
presentToast() {
let toast = this.toastCtrl.create({
message: '再按一次退出应用',
duration: 2000,
position: 'top',
});
toast.onDidDismiss(() => {
console.log('Dismissed toast');
});
toast.present();
}
}
4.app.html文件
<ion-nav #myNav [root]="rootPage"></ion-nav>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
