什么是 Framer Motion
Framer Motion 是一个专门为 React 设计的、功能强大且易于使用的动画库。它允许开发者轻松地为他们的应用添加流畅的交互和动画效果，而不需要深入理解复杂的动画原理。Framer Motion 提供了声明式的 API 来处理动画、手势以及页面转换，非常适合用来创建响应式用户界面。
首屏加载动画
如果你使用 next.js 构建单页面应用程序，页面一开始资源加载会导致页面空白，一般我们的做法都是在首屏添加加载动画，等资源加载完成再把动画取消。
- 新建
components/FullLoading/index.tsx文件：
'use client';
import { useEffect, useState } from 'react';
const FullLoading = () => {
const [mounted, setMounted] = useState(false);
useEffect(() => {
setMounted(true);
}, []);
// 判断组件是否挂载
if (!mounted) {
return (
<div className="fixed flex w-screen h-screen justify-center items-center flex-col z-[99] overflow-hidden bg-white dark:bg-slate-900">
<div className="relative w-12 h-12 rotate-[165deg] before:content-[''] after:content-[''] before:absolute after:absolute before:top-2/4 after:top-2/4 before:left-2/4 after:left-2/4 before:block after:block before:w-[.5em] after:w-[.5em] before:h-[.5em] after:h-[.5em] before:rounded after:rounded before:-translate-x-1/2 after:-translate-x-1/2 before:-translate-y-2/4 after:-translate-y-2/4 before:animate-[loaderBefore_2s_infinite] after:animate-[loaderAfter_2s_infinite]"></div>
</div>
);
}
return null;
};
export default FullLoading;
-
app/globals.scss中加入代码：
@keyframes loaderBefore {
0% {
width: 0.5em;
box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
}
35% {
width: 2.5em;
box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);
}
70% {
width: 0.5em;
box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);
}
100% {
box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
}
}
@keyframes loaderAfter {
0% {
height: 0.5em;
box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
}
35% {
height: 2.5em;
box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);
}
70% {
height: 0.5em;
box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);
}
100% {
box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
}
}
-
layout.tsx中引用组件：
export default async function RootLayout({
children,
}: Readonly<{
children: React.ReactNode;
}>) {
return (
<html suppressHydrationWarning>
<body>
<NextUIProvider>
<ThemeProvider attribute="class" defaultTheme="light">
{/* 全局 Loading */}
<FullLoading />
{children}
</ThemeProvider>
</NextUIProvider>
</body>
</html>
);
}
实际效果可参考网站：今日热榜
路由加载 Loading
next.js 提供了现成的方案，官方文档参考：loading.js
新建 app/loading.tsx 文件：
import { Spinner } from '@nextui-org/react';
export default function Loading() {
return (
<div className="flex justify-center items-center min-h-60">
<Spinner label="页面正在加载中..." />
</div>
);
}
路由进场动画
- 新建
app/template.tsx文件：
"use client";
import { motion } from "framer-motion";
export default function Template({ children }: { children: React.ReactNode }) {
const variants = {
hidden: { opacity: 0, x: 100 },
enter: { opacity: 1, x: 0 },
};
return (
<motion.main
data-scroll
className="mb-auto p-4"
initial="hidden"
animate="enter"
variants={variants}
transition={{ duration: 0.5, ease: 'easeOut' }}
>
{children}
</motion.main>
);
}
路由退场动画
- 新建
components/PageAnimatePresence/index.tsx文件
"use client";
import { AnimatePresence, motion } from "framer-motion";
import { LayoutRouterContext } from "next/dist/shared/lib/app-router-context.shared-runtime";
import { usePathname } from "next/navigation";
import { useContext, useRef } from "react";
// 阻止页面立即打开，先让退场动画走完，再显示新的页面内容
function FrozenRouter(props: { children: React.ReactNode }) {
const context = useContext(LayoutRouterContext ?? {});
const frozen = useRef(context).current;
return (
<LayoutRouterContext.Provider value={frozen}>
{props.children}
</LayoutRouterContext.Provider>
);
}
const PageAnimatePresence = ({ children }: { children: React.ReactNode }) => {
const pathname = usePathname();
return (
<AnimatePresence mode="wait">
<motion.div
key={pathname}
initial="initialState"
animate="animateState"
exit="exitState"
transition={{
duration: 0.5,
ease: 'easeOut'
}}
variants={{
exitState: { opacity: 0, x: 100 }
}}
className="w-full min-h-screen"
>
<FrozenRouter>{children}</FrozenRouter>
</motion.div>
</AnimatePresence>
);
};
export default PageAnimatePresence;
-
layout.tsx文件中引入组件包裹children:
import PageAnimatePresence from '@/components/PageAnimatePresence'
export default async function RootLayout({
children,
}: Readonly<{
children: React.ReactNode;
}>) {
return (
<html suppressHydrationWarning>
<body>
<NextUIProvider>
<ThemeProvider attribute="class" defaultTheme="light">
{/* 全局 Loading */}
<FullLoading />
<PageAnimatePresence>
{children}
</PageAnimatePresence>
</ThemeProvider>
</NextUIProvider>
</body>
</html>
);
}
效果演示
l5pcschg2irv9d0wmqt1w11522afxist.gif
总结
大家如果有更好的实现方案，可以一起探讨一下。
本文部分效果参考了文章：Next.js 如何实现导航时的过渡动画？（使用 Framer Motion）
