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weixin-xcx-tabbar-switch.html
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<meta name="description" content="做过android的都知道在android里面实现Tab切换非常简单，使用android提供的TabLayout+ViewPager很容器就实现了Tab切换的效果。
但是小程序中是没有提供类似可以直接使用的组件，因此想要实现此功能需要我们自己去编码实现。在上一篇文章中我提到的小程序练手项目就实现了Tab切换效果，具体效果图可以参考文章微信小程序入门项目。
实现思路翻看小程序的文档可以发现，微信为我">
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<meta property="og:description" content="做过android的都知道在android里面实现Tab切换非常简单，使用android提供的TabLayout+ViewPager很容器就实现了Tab切换的效果。
但是小程序中是没有提供类似可以直接使用的组件，因此想要实现此功能需要我们自己去编码实现。在上一篇文章中我提到的小程序练手项目就实现了Tab切换效果，具体效果图可以参考文章微信小程序入门项目。
实现思路翻看小程序的文档可以发现，微信为我">
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但是小程序中是没有提供类似可以直接使用的组件，因此想要实现此功能需要我们自己去编码实现。在上一篇文章中我提到的小程序练手项目就实现了Tab切换效果，具体效果图可以参考文章微信小程序入门项目。
实现思路翻看小程序的文档可以发现，微信为我">
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微信小程序之Tab切换
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<p>做过<code>android</code>的都知道在<code>android</code>里面实现<code>Tab切换</code>非常简单，使用<code>android</code>提供的<code>TabLayout+ViewPager</code>很容器就实现了<code>Tab切换</code>的效果。</p>
<p>但是小程序中是没有提供类似可以直接使用的组件，因此想要实现此功能需要我们自己去编码实现。在<a href="http://ittiger.cn/weixin-xcx-first-project.html">上一篇</a>文章中我提到的小程序练手项目就实现了<code>Tab切换</code>效果，具体效果图可以参考文章<a href="http://ittiger.cn/weixin-xcx-first-project.html">微信小程序入门项目</a>。</p>
<h3 id="实现思路"><a href="#实现思路" class="headerlink" title="实现思路"></a>实现思路</h3><p>翻看小程序的文档可以发现，微信为我们提供了一个<code>swiper</code>组件，通过该组件可以实现<code>view</code>的滑动切换，它的功能与<code>android</code>中的<code>ViewPager</code>是类似的。因此实现<code>Tab切换</code>现在只需要实现头部的<code>Tabbar</code>即可，对于该功能我们可以采用多个横向排列的<code>view</code>组件构成一个<code>Tabbar</code>，每个<code>view</code>组件作为一个<code>Tab</code>项，然后再将其点击事件与<code>swiper</code>进行关联即可实现<code>Tab</code>的点击和滑动切换功能。而对于<code>Tabbar</code>的当前<code>Tab</code>项下面的指示器我们可以采用<code>border-bottom</code>样式实现，也可以单独使用一个<code>view</code>组件作为指示器，我这里采用的是第二种方式实现指示器。</p>
<h3 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h3><p>实现代码如下：</p>
<h4 id="页面布局代码"><a href="#页面布局代码" class="headerlink" title="页面布局代码"></a>页面布局代码</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">view</span> <span class="attr">class</span>=<span class="string">"page"</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">class</span>=<span class="string">"navbar"</span>></span></div><div class="line"> <span class="tag"><<span class="name">block</span> <span class="attr">wx:for</span>=<span class="string">"{{tabs}}"</span> <span class="attr">wx:key</span>=<span class="string">"*this"</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">id</span>=<span class="string">"{{index}}"</span> <span class="attr">class</span>=<span class="string">"navbar__item {{activeIndex == index ? 'navbar__item_on' : ''}}"</span> <span class="attr">bindtap</span>=<span class="string">"navTabClick"</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">class</span>=<span class="string">"navbar__title"</span>></span>{{item.name}}<span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">block</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">class</span>=<span class="string">"navbar__slider"</span> <span class="attr">style</span>=<span class="string">"width: {{sliderWidth}}px; transform: translateX({{sliderOffset}}px); -webkit-transform: translateX({{sliderOffset}}px);"</span>></span><span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">style</span>=<span class="string">"position: absolute;top: 68rpx;width: 100%;height:{{contentHeight}}px"</span>></span></div><div class="line"> <span class="tag"><<span class="name">swiper</span> <span class="attr">current</span>=<span class="string">"{{activeIndex}}"</span> <span class="attr">duration</span>=<span class="string">"300"</span> <span class="attr">bindchange</span>=<span class="string">"bindChange"</span>></span></div><div class="line"> <span class="tag"><<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span>></span>热门视频<span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span>></span>比赛集锦<span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span>></span>你懂专栏<span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"><<span class="name">view</span>></span>天下足球<span class="tag"></<span class="name">view</span>></span></div><div class="line"> <span class="tag"></<span class="name">swiper-item</span>></span></div><div class="line"> <span class="tag"></<span class="name">swiper</span>></span> </div><div class="line"> <span class="tag"></<span class="name">view</span>></span></div><div class="line"><span class="tag"></<span class="name">view</span>></span></div></pre></td></tr></table></figure>
<h4 id="布局样式代码"><a href="#布局样式代码" class="headerlink" title="布局样式代码"></a>布局样式代码</h4><figure class="highlight"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div></pre></td><td class="code"><pre><div class="line">view , page {</div><div class="line"> padding: 0px;</div><div class="line"> margin: 0px;</div><div class="line">}</div><div class="line"></div><div class="line">.page {</div><div class="line"> height: 100%;</div><div class="line">}</div><div class="line"></div><div class="line">.navbar {</div><div class="line"> display: flex;</div><div class="line"> position: absolute;</div><div class="line"> z-index: 500;</div><div class="line"> top: 0;</div><div class="line"> width: 100%;</div><div class="line">}</div><div class="line"></div><div class="line">.navbar__item {</div><div class="line"> position: relative;</div><div class="line"> display: block;</div><div class="line"> flex: 1;</div><div class="line"> padding: 10rpx 0;</div><div class="line"> text-align: center;</div><div class="line"> font-size: 0;</div><div class="line"> height: 48rpx;</div><div class="line"> line-height: 48rpx;</div><div class="line"> <!-- NavBar的总高度为：height + padding-top + padding-bottom = 68rpx --></div><div class="line">}</div><div class="line"></div><div class="line">.navbar__item_on {</div><div class="line"> color: #16B13A;</div><div class="line">}</div><div class="line"></div><div class="line">.navbar__slider {</div><div class="line"> position: absolute;</div><div class="line"> display: block;</div><div class="line"> content: " ";</div><div class="line"> left: 0;</div><div class="line"> bottom: 0;</div><div class="line"> height: 3px;</div><div class="line"> background-color: #16B13A;</div><div class="line"> transition: transform .3s;</div><div class="line">}</div><div class="line"></div><div class="line">.navbar__title{</div><div class="line"> display: inline-block;</div><div class="line"> font-size: 15px;</div><div class="line"> max-width: 8em;</div><div class="line"> text-align: center;</div><div class="line">}</div><div class="line"></div><div class="line">swiper {</div><div class="line"> height: 100%;</div><div class="line">}</div><div class="line"></div><div class="line">swiper-item{</div><div class="line"> width: 100%;</div><div class="line"> padding-top: 20rpx;</div><div class="line"> text-align: center;</div><div class="line">}</div></pre></td></tr></table></figure>
<h4 id="js代码"><a href="#js代码" class="headerlink" title="js代码"></a>js代码</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> tabs = [</div><div class="line"> {</div><div class="line"> name: <span class="string">"热门视频"</span></div><div class="line"> },</div><div class="line"> {</div><div class="line"> name: <span class="string">"比赛集锦"</span></div><div class="line"> },</div><div class="line"> {</div><div class="line"> name: <span class="string">"你懂专栏"</span></div><div class="line"> },</div><div class="line"> {</div><div class="line"> name: <span class="string">"天下足球"</span></div><div class="line"> }</div><div class="line">];</div><div class="line"></div><div class="line">Page({</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * 页面的初始数据</div><div class="line"> */</div><div class="line"> data: {</div><div class="line"> tabs: tabs, <span class="comment">//展示的数据</span></div><div class="line"> slideOffset: <span class="number">0</span>,<span class="comment">//指示器每次移动的距离</span></div><div class="line"> activeIndex: <span class="number">0</span>,<span class="comment">//当前展示的Tab项索引</span></div><div class="line"> sliderWidth: <span class="number">96</span>,<span class="comment">//指示器的宽度,计算得到</span></div><div class="line"> contentHeight: <span class="number">0</span><span class="comment">//页面除去头部Tabbar后，内容区的总高度，计算得到</span></div><div class="line"> },</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * 生命周期函数--监听页面加载</div><div class="line"> */</div><div class="line"> onLoad: <span class="function"><span class="keyword">function</span> (<span class="params">options</span>) </span>{</div><div class="line"> <span class="keyword">var</span> that = <span class="keyword">this</span>;</div><div class="line"> wx.getSystemInfo({</div><div class="line"> success: <span class="function"><span class="keyword">function</span> (<span class="params">res</span>) </span>{</div><div class="line"> that.setData({</div><div class="line"> <span class="comment">//计算相关宽度</span></div><div class="line"> sliderWidth: res.windowWidth / that.data.tabs.length,</div><div class="line"> sliderOffset: res.windowWidth / that.data.tabs.length * that.data.activeIndex,</div><div class="line"> contentHeight: res.windowHeight - res.windowWidth / <span class="number">750</span> * <span class="number">68</span><span class="comment">//计算内容区高度，rpx -> px计算</span></div><div class="line"> });</div><div class="line"> }</div><div class="line"> });</div><div class="line"> },</div><div class="line"></div><div class="line"> bindChange: <span class="function"><span class="keyword">function</span> (<span class="params">e</span>) </span>{</div><div class="line"> <span class="keyword">var</span> current = e.detail.current;</div><div class="line"> <span class="keyword">this</span>.setData({</div><div class="line"> activeIndex: current,</div><div class="line"> sliderOffset: <span class="keyword">this</span>.data.sliderWidth * current</div><div class="line"> });</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">"bindChange:"</span> + current);</div><div class="line"> },</div><div class="line"></div><div class="line"> navTabClick: <span class="function"><span class="keyword">function</span> (<span class="params">e</span>) </span>{</div><div class="line"> <span class="keyword">this</span>.setData({</div><div class="line"> sliderOffset: e.currentTarget.offsetLeft,</div><div class="line"> activeIndex: e.currentTarget.id</div><div class="line"> });</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">"navTabClick:"</span> + e.currentTarget.id);</div><div class="line"> }</div><div class="line">})</div></pre></td></tr></table></figure>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>上面的布局代码和js代码其实写起来都不难，关键在于css样式的编写，对于不熟悉CSS的人来说调样式太痛苦了。这个效果也是我调了好半天，参考了好多代码之后写出来的，真o(╯□╰)o，看来想写好小程序还得好好学学CSS样式。</p>
<hr>
<p>原创文章，本文采用<a href="https://creativecommons.org/licenses/by/2.5/cn/" target="_blank" rel="external">知识共享署名 2.5(中国大陆许可协议)</a>进行许可，欢迎转载，但转载请注明来自<a href="ittiger.cn">ittiger.cn</a>，并保证转载后文章内容的完整性。本人(laohu)保留所有版权相关权利。</p>
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