微信小程序之自定义底部弹出框动画

1 wxml

<view class="modals modals-bottom-dialog" hidden="{{hideModal}}">
    <view class="modals-cancel" bindtap="hideModal"></view>
    <view class="bottom-dialog-body bottom-pos" animation="{{animationData}}"></view>
</view>

2 wxss

.modals{
  position:fixed; 
  z-index: 999; 
  top:0; 
  left: 0;
  right:0;
  bottom: 0;
}
.modals-cancel{
  position:absolute;
  z-index:1000;
  top:0;
  left: 0;
  right:0;
  bottom: 0;
  background-color: rgba(0,0,0,.5);
  }
.bottom-dialog-body{
  position:absolute; 
  z-index:10001; 
  bottom:0; 
  left:0; 
  right:0; 
  padding:30rpx; 
  height:300rpx; 
  background-color: #fff;
}
/*动画前初始位置*/
.bottom-pos{
  -webkit-transform:translateY(100%);
  transform:translateY(100%);
}

3 js

Page({
    data:{
      hideModal:true, //模态框的状态  true-隐藏  false-显示
      animationData:{},//
    },

  // 显示遮罩层
    showModal: function () {
    var that=this;
    that.setData({
      hideModal:false
    })
    var animation = wx.createAnimation({
      duration: 600,//动画的持续时间 默认400ms   数值越大，动画越慢   数值越小，动画越快
      timingFunction: 'ease',//动画的效果 默认值是linear
    })
    this.animation = animation 
    setTimeout(function(){
      that.fadeIn();//调用显示动画
    },200)   
  },

  // 隐藏遮罩层
  hideModal: function () {
    var that=this; 
    var animation = wx.createAnimation({
      duration: 800,//动画的持续时间 默认400ms   数值越大，动画越慢   数值越小，动画越快
      timingFunction: 'ease',//动画的效果 默认值是linear
    })
    this.animation = animation
    that.fadeDown();//调用隐藏动画   
    setTimeout(function(){
      that.setData({
        hideModal:true
      })      
    },720)//先执行下滑动画，再隐藏模块
    
  },

  //动画集
  fadeIn:function(){
    this.animation.translateY(0).step()
    this.setData({
      animationData: this.animation.export()//动画实例的export方法导出动画数据传递给组件的animation属性
    })    
  },
  fadeDown:function(){
    this.animation.translateY(300).step()  //移动的距离
    this.setData({
      animationData: this.animation.export(),  
    })
  }, 
})