Vite 暗黑模式

为你的 Vite 应用添加暗黑模式。

暗黑模式

创建主题提供者

components/theme-provider.tsx

import { createContext, useContext, useEffect, useState } from "react"
type Theme = "dark" | "light" | "system"
type ThemeProviderProps = {
  children: React.ReactNode
  defaultTheme?: Theme
  storageKey?: string
}
type ThemeProviderState = {
  theme: Theme
  setTheme: (theme: Theme) => void
}
const initialState: ThemeProviderState = {
  theme: "system",
  setTheme: () => null,
}
const ThemeProviderContext = createContext<ThemeProviderState>(initialState)
export function ThemeProvider({
  children,
  defaultTheme = "system",
  storageKey = "vite-ui-theme",
  ...props
}: ThemeProviderProps) {
  const [theme, setTheme] = useState<Theme>(
    () => (localStorage.getItem(storageKey) as Theme) || defaultTheme
  )
  useEffect(() => {
    const root = window.document.documentElement
    root.classList.remove("light", "dark")
    if (theme === "system") {
      const systemTheme = window.matchMedia("(prefers-color-scheme: dark)")
        .matches
        ? "dark"
        : "light"
      root.classList.add(systemTheme)
      return
    }
    root.classList.add(theme)
  }, [theme])
  const value = {
    theme,
    setTheme: (theme: Theme) => {
      localStorage.setItem(storageKey, theme)
      setTheme(theme)
    },
  }
  return (
    <ThemeProviderContext.Provider {...props} value={value}>
      {children}
    </ThemeProviderContext.Provider>
  )
}
export const useTheme = () => {
  const context = useContext(ThemeProviderContext)
  if (context === undefined)
    throw new Error("useTheme 必须在 ThemeProvider 内部使用")
  return context
}

包装你的根布局

将 ThemeProvider 添加到你的根布局。

App.tsx

import { ThemeProvider } from "@/components/theme-provider"
function App() {
  return (
    <ThemeProvider defaultTheme="dark" storageKey="vite-ui-theme">
      {children}
    </ThemeProvider>
  )
}
export default App

添加模式切换

在你的站点上添加一个模式切换按钮，以在光明模式和暗黑模式之间切换。

components/mode-toggle.tsx

import { Moon, Sun } from "lucide-react"
import { Button } from "@/components/ui/button"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { useTheme } from "@/components/theme-provider"
export function ModeToggle() {
  const { setTheme } = useTheme()
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="outline" size="icon">
          <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
          <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
          <span className="sr-only">切换主题</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme("light")}>
          光明模式
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("dark")}>
          暗黑模式
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("system")}>
          系统模式
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  )
}