微信小程序—這個位置我們可以做點文章

我們都知道微信小程序中支持圖片預覽
調用方式：wx.previewImage()
顯示效果：

感嘆一下微信強大的交互體驗意識，但我想放點毒，這個圖片預覽是不是還能添加點東西，比如是不是可以放個廣告位，不錯的想法！
效果如下：

體驗：

怎麼實現的呢？其實就是模仿微信重新實現了一下預覽效果

頁面代碼
js

Page({
  data: {
    imgUrls: [
      'cloud://normal-env-ta924598/meinv/00004.jpg',
      'https://6e6f-normal-env-ta64598.tcb.qcloud.la/meinv/00002.jpg?sign=2175bd775bbe17ae8545d5f9443a7614&t=1583649476'
    ],
    show: false
  },
  onLoad:function(){
  },
  change(e) {
    console.log('current index has changed', e.detail)
  },
  
  hide() {
    console.log('component hide')
  },
  previewImageCustom(){
    this.setData({
      show:true
    })
  }
});

wxml

<button style="margin-top:50rpx" type="primary" bindtap="previewImageCustom">自定義預覽圖片</button>
<mp-gallery show="{{show}}" bindchange="change" binddelete="delete" bindhide="hide" img-urls="{{imgUrls}}" showDelete="{{true}}" hide-on-click="{{true}}" current="0s">
  <view style="background:white;color:red">自定義區域</view>
</mp-gallery>

json

{
  "usingComponents": {
    "mp-gallery": "gallery/gallery"
  },
  "navigationStyle": "custom"
}

gallery組件代碼：

module.exports =
/******/ (function(modules) { // webpackBootstrap
/******/ 	// The module cache
/******/ 	var installedModules = {};
/******/
/******/ 	// The require function
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/******/
/******/ 		// Check if module is in cache
/******/ 		if(installedModules[moduleId]) {
/******/ 			return installedModules[moduleId].exports;
/******/ 		}
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = installedModules[moduleId] = {
/******/ 			i: moduleId,
/******/ 			l: false,
/******/ 			exports: {}
/******/ 		};
/******/
/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ 		// Flag the module as loaded
/******/ 		module.l = true;
/******/
/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}
/******/
/******/
/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = modules;
/******/
/******/ 	// expose the module cache
/******/ 	__webpack_require__.c = installedModules;
/******/
/******/ 	// define getter function for harmony exports
/******/ 	__webpack_require__.d = function(exports, name, getter) {
/******/ 		if(!__webpack_require__.o(exports, name)) {
/******/ 			Object.defineProperty(exports, name, { enumerable: true, get: getter });
/******/ 		}
/******/ 	};
/******/
/******/ 	// define __esModule on exports
/******/ 	__webpack_require__.r = function(exports) {
/******/ 		if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ 			Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ 		}
/******/ 		Object.defineProperty(exports, '__esModule', { value: true });
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/******/ 		if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
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/******/ 		var getter = module && module.__esModule ?
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/******/ 			function getModuleExports() { return module; };
/******/ 		__webpack_require__.d(getter, 'a', getter);
/******/ 		return getter;
/******/ 	};
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/******/ 	__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
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/******/ 	__webpack_require__.p = "";
/******/
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/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(__webpack_require__.s = 21);
/******/ })
/************************************************************************/
/******/ ({

/***/ 21:
/***/ (function(module, exports, __webpack_require__) {

"use strict";


Component({
    options: {
        addGlobalClass: true
    },
    properties: {
        imgUrls: {
            type: Array,
            value: [],
            observer: function observer(newVal, oldVal, changedPath) {
                this.setData({ currentImgs: newVal });
            }
        },
        showDelete: {
            type: Boolean,
            value: true
        },
        show: {
            type: Boolean,
            value: true
        },
        current: {
            type: Number,
            value: 0
        },
        hideOnClick: {
            type: Boolean,
            value: true
        },
        extClass: {
            type: Boolean,
            value: ''
        }
    },
    data: {
        currentImgs: []
    },
    ready: function ready() {
        var data = this.data;
        this.setData({ currentImgs: data.imgUrls });
    },

    methods: {
        change: function change(e) {
            this.setData({
                current: e.detail.current
            });
            this.triggerEvent('change', { current: e.detail.current }, {});
        },
        deleteImg: function deleteImg() {
            var data = this.data;
            var imgs = data.currentImgs;
            var url = imgs.splice(data.current, 1);
            this.triggerEvent('delete', { url: url[0], index: data.current }, {});
            if (imgs.length === 0) {
                this.hideGallery();
                return;
            }
            this.setData({
                current: 0,
                currentImgs: imgs
            });
        },
        hideGallery: function hideGallery() {
            var data = this.data;
            if (data.hideOnClick) {
                this.setData({
                    show: false
                });
                this.triggerEvent('hide', {}, {});
            }
        }
    }
});

/***/ })

/******/ });

wxml

<view class="weui-gallery {{show ? 'weui-gallery_show' : ''}} {{extClass}}">
  <view class="weui-gallery__info">{{current+1}}/{{currentImgs.length}}</view>
  <swiper class="weui-gallery__img__wrp" bindtap="hideGallery" indicator-dots="{{false}}" bindchange="change" current="{{current}}" autoplay="{{false}}" duration="{{500}}">
    <block wx:for="{{currentImgs}}" wx:key="{{item + '-' +index}}">
      <swiper-item>
        <image mode="aspectFit" class="weui-gallery__img" src="{{item}}"></image>
      </swiper-item>
    </block>
  </swiper>
  <view class="weui-gallery__opr" >
    <slot></slot>
  </view>
</view>

wxss

.weui-gallery {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: #000;
  z-index: 1000;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-flex-wrap: nowrap;
  flex-wrap: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}

.weui-gallery_show {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  visibility: visible;
  opacity: 1;
}

.weui-gallery__img__wrp {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
  position: relative;
  font-size: 0;
}

.weui-gallery__img {
  background: center center no-repeat;
  background-size: contain;
  position: absoulte;
  width: 100%;
  height: 100%;
}

.weui-gallery__opr {
  background-color: #000;
  color: #fff;
  line-height: 60px;
  min-height: 60px;
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
  text-align: center;
}

.weui-gallery__opr navigator {
  color: #fff;
}

.weui-gallery__del {
  display: block;
}

.weui-gallery__info {
  color: #fff;
  font-size: 17px;
  line-height: 60px;
  min-height: 60px;
  text-align: center;
}

json

{
    "component": true,
    "usingComponents": {}
}