【詳細】豆瓣小程序--從0-1實現自己的導航欄控件

    

導航欄是app,小程序中非常常見的一個需求,作爲常見的需求,如何高效地完成該需求的實現,就異常關鍵。那麼我們如何從0到1實現自己的導航欄控件呢,請看本文。

 導航欄實際效果

1. 沒有點擊時候,導航欄顯示放大鏡圖標

2. 點擊導航欄,顯示搜索兩個字

3. 可以輸入關鍵詞,進行搜索導航

由於在一個小程序裏面,導航欄功能出現很多,因此我計劃將其做成一個控件,以便多次複用,減少代碼重複冗餘。這就涉及到了components組件的知識點

那麼這個功能的整體架構和應用可以分爲兩部分,控件的佈局,應用調用頁面的佈局

searchbar空間佈局

      首先是wxml,這裏我定義了search-navigator這個控件對象,isnaviagator這個判斷是否導航的參數,url則是跳轉到對應的導航頁面。

<view class="searchbar">
  <navigator wx:if="{{isnavigator}}" url='/pages/search/search' class='search-navigator'></navigator>
</view>

     其次是js文件,定義isnavigatior參數

// components/searchbar/searchbar.js
Component({
  /**
   * 組件的屬性列表
   */
  properties: {
    isnavigator: {
      type: Boolean,
      value: false
    }
  },

  /**
   * 組件的初始數據
   */
  data: {

  }
})

 接着是,wxss佈局樣式,涉及導航欄的外觀。

background-repeat 屬性設置是否及如何重複背景圖像。默認地,背景圖像在水平和垂直方向上重複。

search-input-group是值得,導航條裏面輸入文字的那部分佈局,見紅圈部分。

background-image:url() 設置的是放大鏡圖片文件位置,這裏也可以才用上傳的webp去實現

.searchbar{
  background-color: #41be57;
  padding: 20rpx;
}

.search-navigator{
  width: 100%;
  height: 60rpx;
  background-color: #fff;
  border-radius: 10rpx;
  background-image: url("pages/images/search.png") ;/* 放大鏡圖片文件 */
  
  /****  採用webp,將圖片上傳到網上,再去url指定獲取圖片  ****/
  /*  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADICAYAAACtWK6eAAAPA0lEQVR4Xu2dj5UUNxLGpQgMERhHwBKBrUnAEIFxBOYiOByBIQKvIzBOYAQR3F4EhyM4iED3Pq/mPDvsTFep1b3qqq/f4wFvJc3qK/
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  background-position: center center;
  background-repeat: no-repeat;
  background-size: 8%;
}

.search-input-group{
  width: 100%;
  height: 60rpx;
  background-color: #fff;
  border-radius: 10rpx;
  padding: 10rpx 20rpx;
  box-sizing: border-box;
}

.search-input{
  min-height: 40rpx;
  height: 40rpx;
  font-size: 12px;
}

這樣一個導航欄的控件searchbar就實現了,那麼該控件在其他頁面如何調用的呢

 

調用導航欄控件 

wxml文件,在這裏直接引用searchbar控件,傳入isnavigtor參數爲true

<searchbar isnavigator="{{true}}"></searchbar>

 對於引用頁面,需要在json中添加引用的控件依賴

{
  "usingComponents": {
    "searchbar":"/components/searchbar/searchbar"   
  }
}

 那麼在這個頁面,我們就可以輕鬆的使用searchbar這個導航欄控件了,非常方便。喜歡給我點個關注吧

 

 

 

 

 

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