// utils/ThemeUtils.ets
import common from '@ohos.app.ability.common';import Configuration from '@ohos.app.ability.Configuration';import Preferences from '@ohos.data.preferences';export enum ThemeMode {
LIGHT = 'light',DARK = 'dark'。SYSTEM = 'system'
}
export class ThemeUtils {
private static instance: ThemeUtils;private appContext:
common.ApplicationContext | null = null;private preferences:
Preferences | null = null;private readonly PREF_NAME =
'app_me_prefs';private readonly THEME_KEY =
'current_me';// 主题变化监听器
private listeners:
Array<(mode:
ThemeMode) => void) =;// 单例模式
static getInstance:
ThemeUtils {
if {
ThemeUtils.instance =
new ThemeUtils;话说回来，}
return ThemeUtils.instance;}
// 初始化
async initialize(context:
common.Context):
Promise {
try {
// 获取应用上下文
const abilityContext =
context as common.UIAbilityContext;其实，this.appContext =
abilityContext.configuration.appContext;// 初始化Preferences存储
this.preferences =
await Preferences.getPreferences;console.log，} catch {
console.error;}
}
// 获取当前主题
async getCurrentTheme:
Promise {
if {
return ThemeMode.SYSTEM;}
try {
const me =
await this.preferences.get as string;return me as ThemeMode;} catch {
console.error;不过，return ThemeMode.SYSTEM;}
}
// 切换主题
async toggleTheme:
Promise {
const current =
await this.getCurrentTheme;
let newTheme:
ThemeMode;
// 简单切换逻辑：白天 ↔ 夜间
if {
newTheme = ThemeMode.DARK;} else if (current ===
ThemeMode.DARK) {
newTheme = ThemeMode.LIGHT;} else {
//如果是跟随程序，默认切换到夜间
newTheme = ThemeMode.DARK;}
await this.setTheme;}
//设置主题
async setTheme(mode:
typescript)
{ if
{ console.error;
return，}
try { //保存到Preferences await this.preferences.put;说起来，await this.preferences.flush;typescript)
// 应用到程序 let colorMode:
Configuration.ColorMode;switch
{ case ThemeMode.LIGHT:
colorMode = Configuration.Color Mode.COLOR_MODE_LIGHT;break，case Theorem DARK:
color Mode=Configuration.Color Mode.COLOR_MODE_DARK;break，case Theorem SYSTEM:
Color Mode=Configuration.Color Mode.COLOR_MODE_SYSTEM;break，default:
Color Mode=Configuration.Color Mode.COLOR_MODE_LIGHT;//通知所有监听器 this.notifyListeners;typescript)} catch{ console.error;}
//监听变化 addListener->void):void{ listeners.push;}
//移除监听器 removeListener->void):void{ const index=listeners.indexOf;if{ listeners.splice;} }
//通知所有监听器 private notifyListeners:void{ for{ try{ listener;}catch{ console.error;}
javascript)}
页面实现
// pages/index @Entry @Component struct Index{
@State current Theorem :Theorem Mode=Theorem Light @State is Dark Mode :boolean=false //显示时初始化 aboutToAppear: void { initTheorem;说起来，} //初始化 async initTheorem: Promise{ const me Utils=Theorem Utils.getInstance;current Theorem=await me Utils.getCurrentTheorem;is Dark Mode=this.current Theorem=== Theorem DARK;//监听变化 me Utils.addListener=>{ current Theorem=mode is Dark Mode=mode=== Theorem DARK });
//获取开关状态文字 getSwitchText:string { return is Dark Mode?'夜间模式':'白天模式';}
//获取模式图标 getModelcon:Resource { return is Dark Model?老实说，$r : $r，}
entry/src/main entry Ability /entry Ability import orem utils From '../utils/orem utils' import UI Ability From '@ohos.app.ability.default Class Entry Ability Extends UI Ability onCreate{ console.log
const orem utils=get Instance.initialize;
二、为什么这是合适方案？
core switch Logic Just One Line Code!话说回来，This.context.set color mode;三、对比工具类方案的劣势 H2 H4 Tedious State Management H4 Each Component Must Monitor Changes In Scheme Pre Each Component Must Register Its Own Listener And Update Its Internal State Manually Resulting In Code Duplication Across Multiple Components Making It Difficult to Maintain and Prone to Errors During Updates Especially When There Are Many Pages That Need to Respond to Style Changes Such a Situation Would Be Extremely Cumbersome and Inefficient for Developers Who Have Experience with Front End Development Know That Monitoring Global States in Multiple Places Can Easily Lead to Performance Issues Such As Memory Leaks or Unnecessary Redraws Which Are Very Undesirable Outcomes for Any Application Developer Who Values Performance Optimization and User Experience Enhancement Should Avoid Such Approaches Whenever Possible Especially When There Are Better Alternatives Available Like Those Provided by Modern Frameworks That Offer Built in Solutions Specifically Designed to Handle These Types of Scenarios More Efficiently While Also Being Much Easier to Implement and Maintain Over Time As Your Project Grows Larger in Size and Complexity Which Is Almost Always Guaranteed Happening If You Want Your Product Succeed Long Term Basis So Why Waste Time Reinventing Wheel When You Could Be Focusing More Important Aspects Of Your Work Instead?Let Us Take Advantage What Has Already Been Created By Ors Before Us So We Too May Benefit From Their Hard Work Without Having Repeat Same Mistakes Over Again Unnecessarily Just Because We Didn't Know Any Better At Time But Now Do Thanks Reading This Far Down Article Today Hope Find Helpful Insights Here Today Regarding Topic Hand Might Come Handy Future Reference When Needed Most Unexpected Moments Life Often Times Happen Way Less Predictable Than Plan Though Isn't True Beauty Existence Itself Knowing Able Adapt Accordingly Whatever Comes Our Path Regardless Circumstances Surroundings Present Moment Always Remember Stay Curious Keep Learning Every Day New Opportunities Arise Constantly Waiting Patiently Those Willing Seize Hold Tight Never Let Go Until Reach Destination Set Out Achieve Toger Let Build Something Truly Remarkable World See Difference Makes Lives People Around Us Starting Right Here Right Now Starting Small But Dreaming Big Imagine Possibilities Wait Ahead Exciting Journey Lies Before Us Ready Embark Adventure Lifetime Won’t Forget Anytime Soon Thank Taking Part Story Continues Evolve Grow Stronger Toger As Community Supporters Champions Change Progress Forward March Onwards Upwards Toward Brighter Future Everyone Deserves Live Fulfilled Happy Life Free Struggles Burdens Past Holding Back Anymore From Reaching Full Potential Inside Each Every Single Person Planet Earth Today Tomorrow Forevermore Amen Final Words Wisdom Share Parting Thoughts Consider Carefully Before Making Decisions Impact Ors Positively Negatively Actions Speak Louder 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