css3 移动端旋转动画暂停

音乐播放图片旋转动画 ios不支持暂停： animation-play-state: paused;

@-webkit-keyframes rotate{
    100% {
           transform: rotate(1turn);
        }
}
.img-wrapper{
    width: 200px;
    height: 200px;
    margin: 50px auto 0;
    overflow: hidden;
    border-radius: 100px;
}
.animation-start{
    animation: rotate 5s linear infinite;
}
.suspended{
    animation-play-state: paused;
}
.img-wrapper img{
    width: 100%;
    border-radius: 100px;
}
.btn{
    width: 100%;
    height: 30px;
    box-sizing: border-box;
    text-align: center;
    margin-top: 20px;
    line-height: 30px;
    bottom: 100px;
    border: 1px solid #ccc;
}

html

 <div class="img-wrapper">
     <img src="http://img001.ddweilai.com/mtrain/2018/03/5ab3630ccbd9e.jpg"/>
 </div>
 <div class="btn">按钮</div>

js

 var isIPHONE = navigator.userAgent.toUpperCase().indexOf('IPHONE')!= -1;
 var isPlaying = false;
 var imgWrapper = $(".img-wrapper")[0];
 var img = $('.img-wrapper').find('img')[0];
 function pause() {
     isPlaying = false;
     var iTransform = getComputedStyle(img).transform;
     var cTransform = getComputedStyle(imgWrapper).transform;
      imgWrapper.style.transform = cTransform === 'none'
                  ? iTransform
                  : iTransform.concat(' ', cTransform);
                   $(img).removeClass('animation-start');
 }
 function play() {
     isPlaying = true;
     $(img).addClass('animation-start');
 }
 if(!isIPHONE){
     $(imgWrapper).addClass('animation-start').addClass('suspended');
 }
 $(".btn").click(function(){
     if(isIPHONE){
         isPlaying ? pause() : play();
     }else{
          if($(imgWrapper).hasClass('suspended')){
　　　　　　　　　　$(imgWrapper).removeClass('suspended');
         }else{
              $(imgWrapper).addClass('suspended');
         }
     }
 });