Ionic3学习笔记（十）实现夜间模式功能

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目录

1. 创建主题样式
2. 导入 variables.scss
3. 创建 provider
4. 创建 page
5. 在 App 入口处应用主题
6. 效果图

1. 创建主题样式

在 ./src/theme 文件夹下创建 theme.light.scss、theme.dark.scss 2个文件，分别用于日间模式、夜间模式的设置。

theme.light.scss:

.light-theme {
  ion-content {
    background-color: #f4f4f4;
  }

  .item {
    background-color: #fff;
  }

  ion-textarea {
    background-color: #fff;
  }

  .toolbar-background {
    background-color: #f8f8f8;
  }

  .tab-button {
    background-color: #f8f8f8;
  }
}

theme.dark.scss:

.dark-theme {
  ion-content {
    background-color: #555;
  }

  .item {
    background-color: #555;
  }

  ion-textarea {
    background-color: #666;
  }

  .toolbar-background {
    background-color: #444;
  }

  .tab-button {
    background-color: #444;
  }
}

这是我的2个主题样式，读者可以自己按需进行编写。

2. 导入 variables.scss

@import "theme.light";
@import "theme.dark";

3. 创建 provider

终端运行:

ionic g provider setting-data

setting-data.ts:

import {Injectable} from '@angular/core';

import {BehaviorSubject} from "rxjs/BehaviorSubject";

@Injectable()
export class SettingDataProvider {

  // true: dark-theme
  // false: light-theme
  theme: BehaviorSubject<boolean>;

  constructor() {
    this.theme = new BehaviorSubject(false);
  }

  setActiveTheme(theme) {
    this.theme.next(theme);
  }

  getActiveTheme() {
    return this.theme.asObservable();
  }

}

4. 创建 page

终端运行:

ionic g page setting

setting.html

<ion-header>

  <ion-navbar>
    <ion-title>设置</ion-title>
  </ion-navbar>

</ion-header>

<ion-content>

  <ion-list>
    <ion-list-header>个性化设置</ion-list-header>
    <ion-item>
      <ion-label>夜间模式</ion-label>
      <ion-toggle checked="{{theme}}" (ionChange)="toggleTheme()"></ion-toggle>
    </ion-item>
  </ion-list>

</ion-content>

setting.ts

import {Component} from '@angular/core';
import {IonicPage, NavController, NavParams, ToastController} from 'ionic-angular';

import {SettingDataProvider} from "../../providers/setting-data/setting-data";

@IonicPage()
@Component({
  selector: 'page-setting',
  templateUrl: 'setting.html',
})
export class SettingPage {

  theme: boolean;

  constructor(public navCtrl: NavController, public navParams: NavParams, public toastCtrl: ToastController, public settingDataProvider: SettingDataProvider) {
    this.getActiveTheme();
  }

  getActiveTheme() {
    this.settingDataProvider.getActiveTheme().subscribe(theme => {
      this.theme = theme;
    });
  }

  toggleTheme() {
    if (!this.theme) {
      this.presentToast('关闭应用后夜间模式将失效');
    }
    this.settingDataProvider.setActiveTheme(!this.theme);
  }

  presentToast(message: string) {
    let toast = this.toastCtrl.create({message: message, duration: 2000});
    toast.present().then(value => {
      return value;
    });
  }

}

5. 在 App 入口处应用主题

app.html

<ion-nav [root]="rootPage" [class]="theme"></ion-nav>

app.component.ts

import {Component} from '@angular/core';

import {Platform} from 'ionic-angular';

import {StatusBar} from '@ionic-native/status-bar';
import {SplashScreen} from '@ionic-native/splash-screen';

import {SettingDataProvider} from "../providers/setting-data/setting-data";

@Component({
  templateUrl: 'app.html'
})

export class MyApp {
  rootPage: any = 'TabsPage';

  theme: string;

  constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen, settingDataProvider: SettingDataProvider) {
    settingDataProvider.getActiveTheme().subscribe(theme => {
      if (theme) {
        this.theme = 'dark-theme';
      } else {
        this.theme = 'light-theme';
      }
    });

    platform.ready().then(() => {
      statusBar.styleDefault();
      splashScreen.hide();
    });
  }
}

6. 效果

如有不当之处，请予指正，谢谢～