微信小程序实现吸顶、网格、瀑布流布局

微信小程序开发通常是在webview模式下编写，但是对小程序的渲染性能有一定的追求，就需要使用Skyline模式进行渲染，同时在这种模式下有也有一些特殊的组件，可以轻松的实现想要的效果，本文将介绍在Skyline模式下如何实现吸顶、网格、瀑布流布局。

以下是具体的实现：

1. 修改渲染模式

1. 在app.json中添加如下配置：

"renderer": "skyline",  // 声明渲染模式
"lazyCodeLoading": "requiredComponents", // 声明依赖注入
"rendererOptions": {   
    "skyline": {
        "defaultDisplayBlock": true, // 默认为块布局
        "defaultContentBox": true,   // 默认开启盒模型
        "disableABTest": true        // 禁用AB测试
    }
},
"componentFramework": "glass-easel" // 使用的组件框架

2. 由于在Skyline模式下，不支持页面全局滚动，也不支持原生导航栏，所以在页面的json配置文件中还要添加如下配置：

{
  "usingComponents": {},
  "disableScroll": true,
  "navigationStyle": "custom"
}

2. 主要组件介绍

1. sticky-section 吸顶布局容器；

仅支持作为 <scroll-view type="custom"> 模式的直接子节点。

2. sticky-header 吸顶布局容器；

仅支持作为 <scroll-view type="custom"> 模式的直接子节点或 sticky-section 组件直接子节点。

3. grid-view 网格布局容器，可实现网格布局、瀑布流布局等；

仅支持作为 <scroll-view type="custom"> 模式的直接子节点。按需渲染节点，比 Webview 兼容实现具备更好的性能。

3. 所有代码实现

1. 以下是WXML文件代码

<!-- index.wxml -->
<scroll-view type="custom" scroll-y show-scrollbar="{{false}}" scroll-into-view="{{intoView}}" class="scroll-view" bindscrolltolower="bindSrollToLower" style="margin-top: {{menuTop}}px;">

    <sticky-section push-pinned-header="{{false}}">
        <sticky-header>
            <view class="sticky-header">
                <view class="search" style="height: {{menuHeight}}px;line-height: {{menuHeight}}px; margin-right: {{menuLeft}}px;">
                    <input placeholder="找找去哪儿玩～" />
                </view>
            </view>
        </sticky-header>
        <grid-view type="aligned" cross-axis-count="5">
            <view wx:for="{{topList}}" class="top-list">
                <image src="https://res.wx.qq.com/op_res/omjFJjgEk_ZZIDmlSIE1hpn57hHOlcHvbMy1jM-BwNFczaS8S_rFryt8b3c7VC4h0BUjX4bSyjoDNaPteTlYcw" mode="aspectFill"></image>
                <text>广州</text>
            </view>
        </grid-view>
    </sticky-section>

    <sticky-section push-pinned-header="{{false}}">
    
        <sticky-header>
            <view class="sticky-header">
                <view class="sticky-header-child">
                    <view class="mini-head current">自然风景</view>
                    <view class="mini-head">周边旅游</view>
                    <view class="mini-head">温泉</view>
                    <view class="mini-head">玩雪</view>
                    <view class="mini-head">海边</view>
                </view>
            </view>
        </sticky-header>

        <grid-view type="masonry" 
            cross-axis-count="{{crossAxisCount}}" 
            cross-axis-gap="{{crossAxisGap}}" 
            main-axis-gap="{{mainAxisGap}}">
            <view wx:for="{{bottomList}}" class="grid-box">

                <image src="{{item.image_url}}" mode="widthFix"></image>

                <view class="content-box">
                    <text>这里的风景好美～</text>

                    <view class="profile-text">
                        <view class="left">
                            <image  src="https://res.wx.qq.com/op_res/lS41C5Xp6y6mfUbelCW8PArEcMwWRuhSohPO46vAiELbhAf56_CwONEDgM2vIVxOlT5KDcSxCkV8xIJ6cg3x2Q"></image>
                            <text>binnie</text>
                        </view>
                        <view class="right">
                            <image  src="https://res.wx.qq.com/community/dist/community/images/disagree_icon_fab2b7.svg"></image>
                            <text>666</text>
                        </view>
                    </view>
                </view>
            </view>
        </grid-view>

    </sticky-section>

</scroll-view>

2. 以下是WXSS文件代码：

/* index.wxss */
.scroll-view {
    width: 100%;
    height: 100%;
}
 
.search {
    border: rgb(228, 226, 226) solid 1px;
    border-radius: 20px;
    margin: 0 10px;
    line-height: 30px;
    height: 30px;
}
 
.search input {
    padding: 0 10px;
    line-height: 30px;
    height: 30px;
}
 
 
.top-list {
    display: flex;
    text-align: center;
    justify-content: center;
    align-items: center;
    padding-top: 10px;
    flex-direction: column;
}
 
 
.top-list image {
    width: 15vw;
    height: 15vw;
    border-radius: 50%;
}
 
.top-list text {
    padding: 10px 0;
    font-size: 14px;
}
 
 
 
.sticky-header {
    background-color: #fff;
}
 
 
.sticky-header-child {
    display: flex;
    flex-direction: row;
}
 
 
.mini-head {
    display: flex;
    background-color: #f5f5f5;
    margin: 8px 6px;
    padding: 6px 8px;
    border-radius: 4px;
    font-size: 14px;
}
 
.current {
    background-color: #07c160;
    color: #fff;
}
 
.grid-box {
    padding: 10px;
    border-radius: 8px;
    background-color: #f5f5f5;
}
 
.grid-box image {
    width: 100%;
}
 
.content-box {
    padding-top: 10px;
}
 
.profile-text {
    display: flex;
    flex-direction: row;
    padding-top: 4px;
    align-items: center;
}
 
.profile-text view {
    display: flex;
    color: #888;
    font-size: 14px;
    flex-direction: row;
    align-items: center;
}
 
.profile-text .left {
    width: 70%;
}
 
.left image {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    margin-right: 4px;
}
 
 
.profile-text .right {
    text-align: right;
    color: #888;
    font-size: 14px;
}
 
.right image {
    width: 16px;
    height: 16px;
    background-size: cover;
    opacity: .5;
    color: rgba(0, 0, 0, .5);
    margin: 0 3px;
}

3. 以下是JavaScript文件代码：

// index.js

import { getLandscapeImages} from './data'

function getNewList() {
    const newList = new Array(20).fill(0);
    const imgUrlList = getLandscapeImages();
    let count = 0;
    for (let i = 0; i < newList.length; i++) {
        newList[i] = {
            id: i+1,
            title: `scroll-view`,
            desc: `默认只会渲染在屏节点，会根据直接子节点是否在屏来按需渲染`,
            time: `19:20`,
            like: 88,
            image_url: imgUrlList[(count++) % imgUrlList.length],
        }
    };
    return newList;
}

Page({

    data: {

        // 顶部列表数据
        topList: new Array(15).fill(0),
        // 底部列表数据
        bottomList: getNewList(),

        // 网络布局参数
        crossAxisCount: 2,
        crossAxisGap: 8,
        mainAxisGap: 8,

        // 顶部布局参数
        menuTop: 0,
        menuHeight:0,
        menuLeft:0
    
    },
    onLoad() {
        const res = wx.getMenuButtonBoundingClientRect();
        this.setData({
            menuTop: res.top,
            menuHeight: res.height,
            menuLeft: res.width + 10
        })
    },
    bindSrollToLower() {
        this.setData({
            bottomList: this.data.bottomList.concat(getNewList())
        })
    },


})

4. 以下是上面JavaScript代码中引入的本地模拟数据文件data.js代码：

// data.js

const landscapeList = [
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYfaqohk6ndcC6_CBkUZszfSpKbqUAV7S2xWRbAQ459YsPWAmLKkicEOPS1L3NmnnRA',
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYYjda9Dp372N3T05q_nn3PgvoXBoReXvaXBfkthtXQLN7m5_YI6FoTre-xvJBDFLMA',
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYfa6mRnywhNbBFV5eAt7oTz3zjlNJeujfQx0PVA1ufenPHBvxYXRNJ5chyi6RPaE7A',
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYYY1OalScOn4EMcQpkPaJ1Sxhri8CScjnhqVfjAZnLuVFl0JAM4VziHhSzHLZXtAaQ',
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYZB1p48LLH-Pc7Rzr4nN0YF-uZg7FW7zksw_Kjp0BNDHcZp9R9SRKbg0rA1HBaeK3Q',
    'https://res.wx.qq.com/op_res/0-l2fyKjv3_BR62E3KwTJPRaN5CDI6NZFg_qbSxeqF8UBpM4lXJ_1o9S9bsOOxMpuXGLeKyAKleWlAXmVLmQOw',
    'https://res.wx.qq.com/op_res/7_miJnK0wxIrh5bV2QqvYRu0VRyVvePJ4pB4_Dvj0ytF-ovjQzMl6WMLyuCeKk3579HNjKLIeNrHE7OprTBx5w'
]
  
export function getLandscapeImages() {
  return landscapeList
}

5. 以下是页面配置文件代码：

{
    "usingComponents": {},
    "disableScroll": true,
    "navigationStyle": "custom"
}