效果

用户可以通过拖拽卡片，来将其移除。除此之外还添加了大量的交互式动画。

效果图

实现

为了提升运行速度，采用了只生成两张卡片，并将其不断复用的方法。

当用户点击卡片式，记录此次的点击位置，并将这张卡片变小，产生按压的效果。

  viewTouchInside: function (event) {

    var that = this

    var pointX = event.touches[0].clientX
    var pointY = event.touches[0].clientY

    that.setData({
      startX: pointX,
      startY: pointY
    })

    var animation = wx.createAnimation({
      duration: 100,
      timingFunction: 'ease-out',
    })
    animation.scale(0.9).step()

    if (that.data.isFirstCard == true) {
      that.setData({
        animation1: animation.export()
      })
    } else {
      that.setData({
        animation2: animation.export()
      })
    }
  }

当用户拖拽卡片时，卡片会随着手指移动，并旋转。下方的卡片也会逐渐从透明度为0的状态显现出来。

viewDidMove: function (event) {
    
    var that = this

    var pointX = event.touches[0].clientX
    var pointY = event.touches[0].clientY

    var widthCenter = that.data.windowWidth / 2
    var heightCenter = that.data.windowHeight / 2

    var perX = (pointX - that.data.startX) / widthCenter
    var perY = (pointY - that.data.startY) / heightCenter
    var maxPer = (Math.abs(perX) > Math.abs(perY)) ? Math.abs(perX) : Math.abs(perY)


    var animationOpacity = wx.createAnimation({
      duration: 100,
      timingFunction: 'ease-out',
    })
    animationOpacity.opacity(maxPer).step()

    var animationRotate = wx.createAnimation({
      duration: 100,
      timingFunction: 'ease-out',
    })
    animationRotate.scale(0.9).rotate(perX * 20).step()

    var x = marginHori + pointX - that.data.startX
    var y = marginVerti + pointY - that.data.startY

    if (that.data.isFirstCard == true) {
      that.setData({
        left1: x,
        top1: y
      })
      that.setData({
        animation1: animationRotate.export(),
        animation2: animationOpacity.export()
      })
    } else {
      that.setData({
        left2: x,
        top2: y
      })
      that.setData({
        animation1: animationOpacity.export(),
        animation2: animationRotate.export(),
      })
    }
  }

当用户手指离开卡片时，判断是否要进行移除卡片操作。如果需要，则根据卡片的方位移除该卡片，否则将卡片回归原位。

viewTouchUpDownInside: function (event) {

    var that = this

    var endX = event.changedTouches[0].clientX
    var endY = event.changedTouches[0].clientY

    var distanceX = endX - that.data.startX
    var distanceY = endY - that.data.startY

    if (distanceX > 93.75) {
      that.removeCard('right')
    } else if (distanceX < -93.75) {
      that.removeCard('left')
    } else if (distanceY < -100) {
      that.removeCard('up')
    } else if (distanceY > 100) {
      that.removeCard('down')
    }

    if (distanceX < 93.75 && distanceX > -93.75 && distanceY > -150 && distanceY < 150) {
      if (that.data.isFirstCard == true) {
        that.setData({
          top1: marginVerti,
          left1: marginHori
        })
      } else {
        that.setData({
          top2: marginVerti,
          left2: marginHori
        })
      }
    }

    var animation = wx.createAnimation({
      duration: 100,
      timingFunction: 'ease-out',
    })
    animation.scale(1).step()

    if (that.data.isFirstCard == true) {
      that.setData({
        animation1: animation.export()
      })
    } else {
      that.setData({
        animation2: animation.export()
      })
    }

    if (that.data.data.length - that.data.count < 5) {
      that.requestMenu()
    }
  }

以下是移除卡片操作，首先先将卡片移除屏幕，随后再将数据重新填充，回归原位，实现复用机制。

removeCard: function (direction) {

    var that = this

    var animation = wx.createAnimation({
      duration: 250,
      timingFunction: 'linear',
    })

    if (direction == 'right') {
      animation.translateX(400).rotate(45).opacity(0).step()
      animation.translateX(0).rotate(0).step()
    } else if (direction == 'left') {
      animation.translateX(-400).rotate(-45).opacity(0).step()
      animation.translateX(0).rotate(0).step()
    } else if (direction == 'up') {
      animation.translateY(-400).opacity(0).step()
      animation.translateY(0).step()
    } else if (direction == 'down') {
      animation.translateY(400).opacity(0).step()
      animation.translateY(0).step()
    }
    
    if (that.data.isFirstCard == true) {
      that.setData({
        animation1: animation.export(),
        count1: that.data.count1 + 2,
        count: that.data.count + 1,
        name1: that.data.data[that.data.count1 + 2]["name"],
        isLike1: that.data.data[that.data.count1 + 2]["is_like"],
        location1: that.data.data[that.data.count1 + 2]["location"],
        isFirstCard: false
      })

      setTimeout(function () {
        that.setData({
          top1: marginVerti,
          left1: marginHori
        })
      }.bind(that), 250)
    } else {
      that.setData({
        animation2: animation.export(),
        count2: that.data.count2 + 2,
        count: that.data.count + 1,
        name2: that.data.data[that.data.count2 + 2]["name"],
        isLike2: that.data.data[that.data.count2 + 2]["is_like"],
        location2: that.data.data[that.data.count2 + 2]["location"],
        isFirstCard: true
      })

      setTimeout(function () {
        that.setData({
          top2: marginVerti,
          left2: marginHori
        })
      }.bind(that), 100)

      that.setImgURL()
    }
  },

源码

• Github

作者

• zxYin-Github
• 伽马星人-简书