角离子暗模式切换

Question

如何让用户可以选择:

亮|暗|自动

其中亮或暗为PWA的外观，"Auto"遵循系统暗/亮模式。

我已经尝试遵循文档https://ionicframework.com/docs/theming/dark-mode，但即使做document.body.classList.toggle('dark', false);上的ngOnInit在一个组件不工作，谢谢!

编辑:到目前为止，我已经试过了:

mode = 'auto';
prefersDark = window.matchMedia('(prefers-color-scheme: dark)');
constructor() {
this.prefersDark.addEventListener('change', (e) => console.log(e));
}
setMode = async (): Promise<void> => {
const storeMode = this.mode;
await Storage.set({
key: 'keep',
value: storeMode
});
document.body.classList.toggle('dark', true);
};
checkAwake = async (): Promise<void> => {
const { value } = await Storage.get({ key: 'keep' });
if (value) {
this.mode = value;
}
};

但是什么都没有发生，当setMode被调用时，类确实有一个'dark'追加，但是什么都没有改变。当项目从ionic start初始化时，SCSS文件的变量没有改变。

Answer 1

HTML

<ion-item lines="full">
<ion-icon slot="start" name="moon"></ion-icon>
<ion-label>
Toggle Dark Theme
</ion-label>
<ion-toggle id="themeToggle" slot="end"></ion-toggle>
</ion-item>

CSS

body.dark {
--ion-color-primary: #428cff;
--ion-color-primary-rgb: 66, 140, 255;
--ion-color-primary-contrast: #ffffff;
--ion-color-primary-contrast-rgb: 255, 255, 255;
--ion-color-primary-shade: #3a7be0;
--ion-color-primary-tint: #5598ff;
--ion-color-secondary: #50c8ff;
--ion-color-secondary-rgb: 80, 200, 255;
--ion-color-secondary-contrast: #ffffff;
--ion-color-secondary-contrast-rgb: 255, 255, 255;
--ion-color-secondary-shade: #46b0e0;
--ion-color-secondary-tint: #62ceff;
--ion-color-tertiary: #6a64ff;
--ion-color-tertiary-rgb: 106, 100, 255;
--ion-color-tertiary-contrast: #ffffff;
--ion-color-tertiary-contrast-rgb: 255, 255, 255;
--ion-color-tertiary-shade: #5d58e0;
--ion-color-tertiary-tint: #7974ff;
--ion-color-success: #2fdf75;
--ion-color-success-rgb: 47, 223, 117;
--ion-color-success-contrast: #000000;
--ion-color-success-contrast-rgb: 0, 0, 0;
--ion-color-success-shade: #29c467;
--ion-color-success-tint: #44e283;
--ion-color-warning: #ffd534;
--ion-color-warning-rgb: 255, 213, 52;
--ion-color-warning-contrast: #000000;
--ion-color-warning-contrast-rgb: 0, 0, 0;
--ion-color-warning-shade: #e0bb2e;
--ion-color-warning-tint: #ffd948;
--ion-color-danger: #ff4961;
--ion-color-danger-rgb: 255, 73, 97;
--ion-color-danger-contrast: #ffffff;
--ion-color-danger-contrast-rgb: 255, 255, 255;
--ion-color-danger-shade: #e04055;
--ion-color-danger-tint: #ff5b71;
--ion-color-dark: #f4f5f8;
--ion-color-dark-rgb: 244, 245, 248;
--ion-color-dark-contrast: #000000;
--ion-color-dark-contrast-rgb: 0, 0, 0;
--ion-color-dark-shade: #d7d8da;
--ion-color-dark-tint: #f5f6f9;
--ion-color-medium: #989aa2;
--ion-color-medium-rgb: 152, 154, 162;
--ion-color-medium-contrast: #000000;
--ion-color-medium-contrast-rgb: 0, 0, 0;
--ion-color-medium-shade: #86888f;
--ion-color-medium-tint: #a2a4ab;
--ion-color-light: #222428;
--ion-color-light-rgb: 34, 36, 40;
--ion-color-light-contrast: #ffffff;
--ion-color-light-contrast-rgb: 255, 255, 255;
--ion-color-light-shade: #1e2023;
--ion-color-light-tint: #383a3e;
}
/*
* iOS Dark Theme
* -------------------
*/
.ios body.dark {
--ion-background-color: #000000;
--ion-background-color-rgb: 0, 0, 0;
--ion-text-color: #ffffff;
--ion-text-color-rgb: 255, 255, 255;
--ion-color-step-50: #0d0d0d;
--ion-color-step-100: #1a1a1a;
--ion-color-step-150: #262626;
--ion-color-step-200: #333333;
--ion-color-step-250: #404040;
--ion-color-step-300: #4d4d4d;
--ion-color-step-350: #595959;
--ion-color-step-400: #666666;
--ion-color-step-450: #737373;
--ion-color-step-500: #808080;
--ion-color-step-550: #8c8c8c;
--ion-color-step-600: #999999;
--ion-color-step-650: #a6a6a6;
--ion-color-step-700: #b3b3b3;
--ion-color-step-750: #bfbfbf;
--ion-color-step-800: #cccccc;
--ion-color-step-850: #d9d9d9;
--ion-color-step-900: #e6e6e6;
--ion-color-step-950: #f2f2f2;
--ion-toolbar-background: #0d0d0d;
--ion-item-background: #1c1c1c;
--ion-item-background-activated: #313131;
}
/*
* Material Design Dark Theme
* ------------------------------
*/
.md body.dark {
--ion-background-color: #121212;
--ion-background-color-rgb: 18, 18, 18;
--ion-text-color: #ffffff;
--ion-text-color-rgb: 255, 255, 255;
--ion-border-color: #222222;
--ion-color-step-50: #1e1e1e;
--ion-color-step-100: #2a2a2a;
--ion-color-step-150: #363636;
--ion-color-step-200: #414141;
--ion-color-step-250: #4d4d4d;
--ion-color-step-300: #595959;
--ion-color-step-350: #656565;
--ion-color-step-400: #717171;
--ion-color-step-450: #7d7d7d;
--ion-color-step-500: #898989;
--ion-color-step-550: #949494;
--ion-color-step-600: #a0a0a0;
--ion-color-step-650: #acacac;
--ion-color-step-700: #b8b8b8;
--ion-color-step-750: #c4c4c4;
--ion-color-step-800: #d0d0d0;
--ion-color-step-850: #dbdbdb;
--ion-color-step-900: #e7e7e7;
--ion-color-step-950: #f3f3f3;
--ion-item-background: #1a1b1e;
}
/* Optional CSS, this is added for the flashing that happens when toggling between themes */
ion-item {
--transition: none;
}

JavaScript

toggle.addEventListener('ionChange', (ev) => {
document.body.classList.toggle('dark', ev.detail.checked);
});
const prefersDark = window.matchMedia('(prefers-color-scheme: dark)');
// Listen for changes to the prefers-color-scheme media query
prefersDark.addListener((e) => checkToggle(e.matches));
// Called when the app loads
function loadApp() {
checkToggle(prefersDark.matches);
}
// Called by the media query to check/uncheck the toggle
function checkToggle(shouldCheck) {
toggle.checked = shouldCheck;
}