WeChat Mini Program DevelopmentThe column introduces how to customize the animated pop-up box/prompt box of the mini program.

##Foreword

In the mini program , When the user interacts with the interface, there are some user feedback prompts, such as: triggering a button, popping up the box from the bottom, popping up from the top, etc.

Nowadays, there are some ready-made UI libraries, although they have been implemented , but if it is just to implement a bottom pop-up box or a custom prompt box without referencing the third-party UI library

How to implement it manually and natively? The most important thing is how to implement animation

css3 to achieve animation

The following is the

wxmlcode

<view>
  <view class="click-btn" catchtap="onBottomBox">彈出底部彈出框</view>
  <view class="click-btn" bindtap="onTopBox">彈出頂部提示框</view>
  <view wx:if="{{isBottom}}" class="bottom-box">
    <div class="mask" bindtap="onHideBox"></div>
    <div class="pop">底部彈出內(nèi)容</div>
  </view>
  <div wx:if="{{isTop}}" class="top-box">通知內(nèi)容</div>
</view>

/* pages/customalertbox/customalertbox.wxss */
.click-btn {
  width: 120px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  margin: 20px auto;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.top-box {
  width: 100%;
  height: 30px;
  background: #f56c6c;
  border-radius: 0 0 8px 8px;
  color: #fff;
  text-align: center;
  line-height: 30px;
  font-size: 28rpx;
  position: absolute;
  top: 0px;
  left: 0;
  animation-duration: 0.5s;
  animation-name: slidetop;
}

.mask {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.5);
}

.pop {
  position: absolute;
  width: 100%;
  height: 180px;
  background: #42b983;
  border-radius: 8px 8px 0 0;
  position: absolute;
  bottom: 0px;
  animation-duration: 0.5s;
  animation-name: slidein;
}

@keyframes slidein {
  from {
    transform: translateY(70%);
  }
  to {
    transform: translateY(0);
  }
}

@keyframes slidetop {
  from {
    transform: translateY(-30px);
  }
  to {
    transform: translateY(0px);
  }
}

// pages/customalertbox/customalertbox.js
Page({
  /**
   * 頁面的初始數(shù)據(jù)
   */
  data: {
    isBottom: false,
    isTop: false,
  },

  /**
   * 生命周期函數(shù)--監(jiān)聽頁面加載
   */
  onLoad: function(options) {},

  onBottomBox() {
    this.setData({
      isBottom: true,
    });
  },

  onHideBox() {
    this.setData({
      isBottom: false,
    });
  },

  onTopBox() {
    this.setData({
      isTop: true,
    });

    setTimeout(() => {
      this.setData({
        isTop: false,
      });
    }, 2000);
  },
});

.pop {
  /* ...  */
  animation-duration: 0.5s;
  animation-name: slidein; // 動畫的名稱
}

@keyframes slidein {
  // 定義動畫的名稱
  from {
    transform: translateY(70%); // 平移,垂直方向上
  }
  to {
    transform: translateY(0);
  }
}

.top-box {
  /* ... */
  animation-duration: 0.5s;
  animation-name: slidetop;
}

@keyframes slidetop {
  from {
    transform: translateY(-30px);
  }
  to {
    transform: translateY(0px);
  }
}

through

css3#@keyframes and transformation transform, translate in the vertical direction to achieve animationThe sample effect is as follows

Nuggets do not support gif-Instance effect can be clicked on the link

The above is achieved through the animation of

css3

animation combined with the @keyframes animation frame, then in the mini program Among them, it can also be achieved through the official animation API<h2 id="span-class-prefix-style-display-none-span-span-class-content-小程序動畫-API-實現(xiàn)動畫-span-span-class-suffix-span"><span class="prefix" style="display: none;"></span><span class="content">小程序動畫 API-實現(xiàn)動畫</span><span class="suffix"></span></h2><p style="font-size: 16px; padding-top: 8px; padding-bottom: 8px; margin: 0; line-height: 26px; color: black; text-align: justify;">創(chuàng)建一個動畫實例 <code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: #009688;">animation,調(diào)用實例的方法來描述動畫。最后通過動畫實例的 export 方法導出動畫數(shù)據(jù)傳遞給組件的 animation 屬性

示例效果如下所示

掘金不支持gif-實例效果可戳鏈接

如下是實例代碼

<view>
  <view class="click-btn" bindtap="onBottomBox">彈出底部彈出框</view>
  <view class="click-btn" bindtap="onTopBox">彈出頂部提示框</view>
  <view
    wx:if="{{isBottom}}"
    style="position: absolute;width: 100%;height: 100%;bottom: 0px;"
  >
    <div class="mask" bindtap="onHideBox"></div>
    <div class="pop" animation="{{animationData}}">底部彈出內(nèi)容</div>
  </view>
  <div wx:if="{{isTop}}" class="top-box">通知內(nèi)容</div>
</view>

主要是給想要添加動畫的元素添加了一個animation屬性,現(xiàn)在的動畫是通過js去控制,而非css

如下代碼所示

// pages/customalertbox/customalertbox.js
Page({
  /**
   * 頁面的初始數(shù)據(jù)
   */
  data: {
    isBottom: false,
    isTop: false,
    animationData: {}, // 定義動畫對象
  },

  /**
   * 生命周期函數(shù)--監(jiān)聽頁面加載
   */
  onLoad: function(options) {},

  onBottomBox() {
    // 創(chuàng)建動畫
    var animation = wx.createAnimation({
      duration: 2000,
      timingFunction: 'ease',
    });

    this.animation = animation;
    // 先在y軸偏移180，然后用step()完成一個動畫
    animation.translateY(180).step();
    this.setData({
      animationData: animation.export(),
      isBottom: true,
    });

    // 設置setTimeout來改變y軸偏移量，實現(xiàn)有感覺的滑動,回到初始位置
    setTimeout(() => {
      animation.translateY(0).step();
      this.setData({
        animationData: animation.export(),
      });
    }, 200);
  },

  // 點擊遮罩層隱藏彈框
  onHideBox() {
    var animation = wx.createAnimation({
      duration: 2000,
      timingFunction: 'ease',
    });
    this.animation = animation;
    // 先在y軸偏移180，然后用step()完成一個動畫
    animation.translateY(180).step();
    this.setData({
      animationData: animation.export(),
    });
    setTimeout(() => {
      animation.translateY(0).step();
      this.setData({
        animationData: animation.export(),
        isBottom: false,
      });
    }, 200);
  },

  onTopBox() {
    this.setData({
      isTop: true,
    });

    setTimeout(() => {
      this.setData({
        isTop: false,
      });
    }, 2000);
  },
});

以上就是通過微信小程序中動畫API實現(xiàn)的完成的動畫,代碼要比 css3 要多一些,可以實現(xiàn)更加復雜的動畫效果

注意

如果是底部彈出框,拖動里面時,若遮罩層底部會跟著滾動,具體解決辦法也可以在外層添加catchtouchmove="true"即可解決

<view>
  <view class="click-btn" bindtap="onBottomBox">彈出底部彈出框</view>
  <view
    catchtouchmove="true"
    wx:if="{{isBottom}}"
    style="position: absolute;width: 100%;height: 100%;bottom: 0px;"
  >
    <div class="mask" bindtap="onHideBox"></div>
    <div class="pop" animation="{{animationData}}">底部彈出內(nèi)容</div>
  </view>
  <div wx:if="{{isTop}}" class="top-box">通知內(nèi)容</div>
</view>

結語

在小程序當中實現(xiàn)動畫可以用css3的animation結合@keyframes實現(xiàn),同樣也可以通過小程序動畫的api去實現(xiàn)

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