记一次h5动画之旅

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年终活动h5动画总结

戳这里----♂--github--

css3 + react-id-swiper + react + redux + saga
采用postcss的Autoprefixer插件,即可满足大多数oppo,vivo手机的兼容性问题。

1. 动画相关主要内容:

  1. 流星
  2. 闪烁星星
  3. 字的晃动
  4. 人的移动(动画 + 监听动画结束时间)
  5. 桥的铺垫
  6. 开启旅程按钮缩放
  7. 旋转(+ 兼容)
  8. react-id-swiper
  9. swiper配合css3实现切换

2. css3动画语法

  • animation
animation-name
animation-duration
animation-timing-function  速度曲线
animation-delay
animation-iteration-count
animation-direction
play-state	
fill-mode  
  • transform

transform 属性向元素应用 2D 或 3D 转换。该属性允许我们对元素进行旋转、缩放、移动或倾斜。 其中 transform-origin (属性改变被转换元素的中心)。

  • transition

三者区别: animation 动画,关键帧,往复性。 transition 过渡, 属性,触发动作,一过性。 transform 变换, 复杂的变换参数。

3. 示例 github.com/hytStart/Re…

  • 流星

改变位置translate3d,透明度opacity和大小scale
流星尾巴采用伪元素元素:after旋转-45deg(旋转基点为左transform-origin: left;);采用border可以实现,靠近头部越亮,靠近尾部越暗。

图一 流星

.star {
    display: block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #FFF;
    top: 10px;
    left: 200px;
    position: relative;
    animation: star-ani 6s infinite ease-out;
    box-shadow: 0 0 5px 5px rgba(255, 255, 255, .3);
    opacity: 1;
}
.star:after {
    content: '';
    display: block;
    top: 0px;
    left: 40%;
    border: 0px solid #fff;
    border-width: 0px 90px 2px 90px;
    border-color: transparent transparent transparent rgba(255, 255, 255, .3);
    transform: rotate(-45deg) translate3d(1px, 3px, 0);
    box-shadow: 0 0 1px 0 rgba(255, 255, 255, .1);
    transform-origin: left;
}

@keyframes star-ani {
    0% {
        opacity: 0;
        transform: scale(0) rotate(0) translate3d(0, 0, 0);
    }
    50% {
        opacity: 1;
        transform: scale(1) rotate(0) translate3d(-100px, 100px, 0);
    }
    100% {
        opacity: 0;
        transform: scale(1) rotate(0) translate3d(-200px, 200px, 0);
    }
}
  • 闪烁星星

改变透明度

.shine {
    background: url('../../../../images/action/icon-star1.png') no-repeat center;
    background-size: 100%;
    width: 30px;
    height: 40px;
    position: absolute;
    top: 90px;
    left: 100px;
    opacity: 0;
    animation: opacity-change 0.5s ease-in-out infinite;
}

@keyframes opacity-change {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

分为两段动画,下降和上升。translateY改变即可。

.text-item-0 {
    position: absolute;
    width: 25px;
    height: 75px;
    top: 60px;
    left: 100px;
    background: url('../../../../images/action/S-start.png') no-repeat center;
    background-size: 100%;
    animation: letter-0 1.5s ease-in-out both, letter-0-1 2.0s ease-in-out 1.5s both;
}

@keyframes letter-0 {
    0% {
        transform: translateY(0)
    }
    50% {
        transform: translateY(80px)
    }
    100% {
        transform: translateY(0px)
    }
}
@keyframes letter-0-1 {
    0% {
        opacity: 1;
    }
    100% {
        top: -80px;
        opacity: 0;
    }
}
  • 人移动

切换dom,添加类控制移动和暂停,以及切换背景人物。监听animationend事件。

jsx
{
    peopleMove ?
        <div
            className={`${style.people_move} ${!pausedState && style.people_paused}`}
            ref={start2 => { this.start2 = start2 }}
        />
        :
        <div className={style.people} />
}
css
.people {
    width: 20px;
    height: 64px;
    position: absolute;
    left: 10px;
    top: 130px;
    background: url('../../../../images/action/people.png') no-repeat center;
    background-size: 100%; 
    opacity: 0;
    animation: peopleUp 1s ease-in-out 0.5s both;
}
.people_move {
    background: url('../../../../images/action/people_moveleft.gif');
    background-size: 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
    width: 20px;
    height: 64px;
    position: absolute;
    left: 10px;
    top: 130px;
    opacity: 1;
    animation: PeopleMove 1.5s linear 0s both;
}
.people_paused {
    width: 20px;
    height: 64px;
    background: url('../../../../images/action/people.png');
    background-size: 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
    animation-play-state: paused;
}

@keyframes peopleUp {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}
@keyframes PeopleMove {
    0% {
        left: 10px;
        top: 130px;
    }
    100% {
        top: 20px;
        left: 180px;
        background-size: 100% 100%;
        background-position: center;
        background-repeat: no-repeat;
    }
}

// 监听动画结束时机
componentDidUpdate() {
    const { peopleMove } = this.state
    if (peopleMove) {
        this.start2.addEventListener('animationend', this.end)
        this.start2.addEventListener('webkitAnimationEnd', this.end)
        this.start2.addEventListener('mozAnimationEnd', this.end)
        this.start2.addEventListener('oAnimationEnd', this.end)
    }
}
  • 桥的出现

配合background-size: cover;属性实现。

.brige {
    width: 0px;
    background: url('../../../../images/action/bridge.png');
    background-size: cover;
    background-repeat: no-repeat;
    height: 100px;
    position: absolute;
    top: 40px;
    left: 30px;
    animation: BridgeFadeIn 3s linear both;
    opacity: 0;
}

@keyframes BridgeFadeIn {
    0% {
        width: 0px;
        opacity: 0;
    }
    100% {
        width: 200px;
        opacity: 1;
    }
}
  • 渐变大(开始旅程)

利用transform scale2D 缩放转换。

.icon-ciecle {
    display: block;
    position: absolute;
    left: 100px;
    top: 80px;
    width: 30px;
    height: 30px;
    background: url('../../../../images/action/icon-light.png') no-repeat center;
    background-size: 100%; 
    animation: warn 1.2s ease-in-out 0s infinite both;
}

@keyframes warn {
    0% {
        transform: scale(0.1);
        opacity: 0.0;
    }
    25% {
        transform: scale(0.2);
        opacity: 0.3;
    }
    50% {
        transform: scale(0.4);
        opacity: 0.5;
    }
    75% {
        transform: scale(0.6);
        opacity: 0.7;
    }
    100% {
        transform: scale(0.8);
        opacity: 0.0;
    }
}
  • 旋转

ios的animation-play-state: paused;不起作用,且animation动画不可写在新增类里,必须写在一个类里。(测试中发现,这里有疑问。)

.music_img {
    width: 40px;
    height: 40px;
    display: block;
    position: absolute;
    left: 100px;
    top: 80px;
    animation: rotating 3s linear infinite;
    animation-play-state: running;
}
.rotate-pause {
    animation-play-state: paused;
}

@keyframes rotating {
    0% {
    	transform: rotate(0deg);
     }
    100% { 
	transform: rotate(360deg);
     }
}
  • react-id-swiper

Swiper的react版本,基本api都支持,具实验目测相当于Swiper v4。

  1. 不一定通过api。也可以通过重写css实现。
  2. 重写css切换效果的话,会影响它本身的动画效果,所以可通过添加不可滑动来控制。
1. 
.swiper-wrapper {
    transition-delay: 1.6s;
}
2. 
noSwiping: true,
noSwipingClass: 'stop-swiping',
  • Swiper实现的迷宫切换

1.swiper的effect属性与控制背景图片的opacity,利用时间差实现最终效果。包括迷宫的切换,背包男的出现与消失,弹窗的出现与消失。
2.swiper属性的activeIndex,可以得到滑动到第几页,通过改变dom或者改变类,控制第几页动画的发生。

// 根据activeIndex拿到的页数,控制该页数state的改变,通过切换dom和添加类的方式,达到进场与退场的动画效果。
// 添加类stop-swiping控制不可滑动,动画完成后,才可继续滑动下一页。
const mazeStyle = classNames({
    [styles['maze-1']]: true,
    [styles['maze-out']]: firstMazeOut,
})
const peopleStyle = classNames({
    [styles['people-1']]: true,
    [styles['people-out']]: firstMazeOut,
})
const popCardStyle = classNames({
    [styles['pop-card-container']]: true,
    [styles['pop-card-out']]: firstMazeOut,
})
{
    firstMazeIn ?
        <div className={!isSlideFirst && "stop-swiping"}>
            <div className={styles['maze-container']}>
                <div className={mazeStyle} />
                <div className={peopleStyle} />
            </div>
            <div className={popCardStyle}>
                <ModalScene {...this.props} />
            </div>
        </div>
        :
        <div />    // 不添加会影响swiper自身页数的判断
}

4. 动画总结

别人写的真牛X,自己只会opacity,translate

5. 待完善

  • html2canvas
  • 资源加载
  • jsbridge使用与注意事项