uniapp 怎么设置凸起的底部tabbar

1. uniapp 怎么设置凸起的底部tabbar

1.1. 方案一系统提供

1.1.1. 使用uniapp官方提供的属性midButton

  使用时，list数组须为偶数
（1）pages.json

"tabBar": {
		"custom": true,
		"color": "#8F8F94",
		"selectedColor": "#007aff",
		"borderStyle": "black",
		"backgroundColor": "#ffffff",
		"iconWidth": "30px",
		"fontSize": "13px",
		"list": [
			{
				"pagePath": "pages/main/home/home",
				"iconPath": "static/main/icon_main_home_normal.png",
				"selectedIconPath": "static/main/icon_main_home_select.png",
				"text": "首页"
			},
			{
				"pagePath": "pages/main/apply/apply",
				"iconPath": "static/main/icon_main_apply_normal.png",
				"selectedIconPath": "static/main/icon_main_apply_select.png",
				"text": "应用"
			},
			{
				"pagePath": "pages/main/msg/msg",
				"iconPath": "static/main/icon_main_msg_normal.png",
				"selectedIconPath": "static/main/icon_main_msg_select.png",
				"text": "消息"
			},
			{
				"pagePath": "pages/main/mine/mine",
				"iconPath": "static/main/icon_main_mine_normal.png",
				"selectedIconPath": "static/main/icon_main_mine_select.png",
				"text": "我的"
			}
		],
		"midButton": {
			"pagePath": "pages/newsList/newsList",
			"iconPath": "static/main/icon_main_apply_normal.png",
			"selectedIconPath": "static/main/icon_main_apply_select.png",
			"width": "80px",
			"height": "80px",
			"iconWidth": "60px",
			"iconheight": "60px",
			"text": "会员"
		}

	},

（2）App.vue

<script>
    export default {


        onLaunch: function() {
            console.log('App Launch')

            //监听凸起页面
            uni.onTabBarMidButtonTap(()=>{
                console.log('App La345unch')
                uni.navigateTo({
                    url: './pages/newsList/newsList'
                });
            })
        },
        onShow: function() {
            console.log('App Show')
        },
        onHide: function() {
            console.log('App Hide')
        }
    }
</script>

<style>
    /*每个页面公共css */
</style>

1.2. 自定义tabBar组件

1.2.1. 把pages.json里的 “custom”: true,

  新建组件tabBar.vue

（1）tab-bar.vue

<template>
    <view class="tab-layout">
        <ul class='tab-ul-layout'
            :class="showMiddleButton === true?'tab-item-middle':'tab-item-default'">
            <li v-for="(item, index) in tabList"
                class="tab-item-normal"
                :class="item.middleClass"
                @click="handlePush(item, index)"
                :key="index">
                <view class="item-img-box">
                    <image class="item-img"
                           :src="tabIndex == index ?
                           item.selectedIconPath : item.iconPath"/>
                </view>
                <view :class="tabIndex == index?
                'tab-item-title-select item-text2'
                :'tab-item-title-normal item-text'">
                    {{item.text}}
                </view>
            </li>
        </ul>
    </view>
</template>

<script>
    export default {
        props: {
            tabIndex: { //当前选中的tab项
                type: String,
                default: 0
            }
        },
        data() {
            return {
                /*
                 * iconPath: 默认icon图片路径
                 * selectedIconPath: 选中icon图片路径
                 * text: tab按钮文字
                 * pagePath:页面路径
                 * middleClass:中间按钮样式类名
                 * tabList最小两项，最多五项
                 * tabList长度为奇数时，中间按钮才会突出显示
                 *
                 */
                tabList: [
                    {
                        iconPath: '/static/main/icon_main_home_normal.png',
                        selectedIconPath: '/static/main/icon_main_home_select.png',
                        text: '首页',
                        pagePath: '/pages/main/home/home',
                        middleClass: ''
                    },
                    {
                        iconPath: '/static/main/icon_main_apply_normal.png',
                        selectedIconPath: '/static/main/icon_main_apply_select.png',
                        text: '审批',
                        pagePath: '/pages/main/approval/approval',
                        middleClass: ''
                    },
                    {
                        iconPath: '/static/main/icon_main_apply_normal.png',
                        selectedIconPath: '/static/main/icon_main_apply_select.png',
                        text: '工作台',
                        pagePath: '/pages/main/apply/apply',
                        middleClass: 'tab-item-middle'
                    },
                    {
                        iconPath: '/static/main/icon_main_msg_normal.png',
                        selectedIconPath: '/static/main/icon_main_msg_select.png',
                        text: '消息',
                        pagePath: '/pages/main/msg/msg',
                    },
                    {
                        iconPath: '/static/main/icon_main_mine_normal.png',
                        selectedIconPath: '/static/main/icon_main_mine_select.png',
                        text: '我的',
                        pagePath: '/pages/main/mine/mine',
                        middleClass: ''
                    }
                ],
                showMiddleButton: false,
            };
        },
        computed: {
            getHeight() {
                return Number(this.height);
            },
        },
        mounted() {


        },
        methods: {
            //点击按钮
            handlePush(item, index) {
                if (this.tabIndex !== index) {
                    // uni.reLaunch({
                    //     url: `${item.pagePath}?tabIndex=${index}`,
                    // })
                    uni.switchTab({
                        url: `${item.pagePath}?tabIndex=${index}`,
                    });
                }
            },
        }
    }
</script>

<style lang="scss">
    .tab-layout{
        width: 100vw;
    }
    .tab-ul-layout {
        align-items: center;
        justify-content: center;
        height: 80px;
        padding: 0; //解决偏移
        display: flex;
        flex-flow: row wrap;
        position: fixed;
        bottom: 0;
        left: 0;
        z-index: 999;
        background-size: contain;
        width: 100vw;
    }


    .tab-item-default {
        background-color: #FFFFFF;
        border-top: 1px #dddddd solid;
    }

    .tab-item-middle {
        position: relative;
        /*background-image: url("https://res/nav_bar_bg_2x.png");*/
        /*background-repeat: no-repeat;*/
        background-size: cover;
    }

    .tab-item-normal {
        flex: 1;
        flex-direction: column;
        align-items: center;
        display: flex;

        .item-img-box {
            width: 44px;
            height: 42px;
            margin-bottom: 1px;
            position: relative;
        }

        .item-img {
            width: 44px;
            height: 42px;
        }

        .item-text {

        }

        .item-text2 {

        }
    }

    .tab-item-middle {
        position: relative;

        .item-img-box {
            position: absolute;
            width: 106px;
            height: 106px;
            z-index: 1002;
            bottom: 1px;
        }

        .item-img {
            width: 106px;
            height: 106px;
        }

        .item-text {
            position: absolute;
            z-index: 1002;
            bottom: -20px;
        }

        .item-text2 {
            position: absolute;
            z-index: 1002;
            bottom: -20px;
        }
    }
    .tab-item-title-normal {
        font-size: 20px;
        color: #333333;
    }

    .tab-item-title-select {
        font-size: 20px;
        color: #007aff;
    }

</style>

</style>

（2）pages.json

{
  "pages": [
    //pages数组中第一项表示应用启动页，参考：https://uniapp.dcloud.io/collocation/pages
    {
      "path": "pages/main/home/home",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false,
        "navigationStyle": "custom"
      }
    },
    {
      "path": "pages/main/msg/msg",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false,
        "navigationStyle": "custom"
      }
    },
    {
      "path": "pages/main/work/work",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false
      }
    },
    {
      "path": "pages/main/mine/mine",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false,
        "navigationStyle": "custom"
      }
    },
    {
      "path": "pages/main/apply/apply",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false,
        "navigationStyle": "custom"
      }
    },
    {
      "path": "pages/index/index",
      "style": {
        "navigationBarTitleText": "uni-app"
      }
    },
    {
      "path": "pages/newsList/newsList",
      "style": {
        "navigationBarTitleText": "",
        "enablePullDownRefresh": false
      }
    },

    {
    	"path" : "pages/main/approval/approval",
    	"style" :
    	{
    		"navigationBarTitleText" : "",
    		"enablePullDownRefresh" : false
    	}
    }
  ],
  "tabBar": {
    "custom": true,
    "color": "#8F8F94",
    "selectedColor": "#007aff",
    "borderStyle": "black",
    "backgroundColor": "#ffffff",
    "iconWidth": "30px",
    "fontSize": "13px",
    "list": [
      {
        "pagePath": "pages/main/home/home",
        "iconPath": "static/main/icon_main_home_normal.png",
        "selectedIconPath": "static/main/icon_main_home_select.png",
        "text": "首页"
      },
      {
        "pagePath": "pages/main/apply/apply",
        "iconPath": "static/main/icon_main_apply_normal.png",
        "selectedIconPath": "static/main/icon_main_apply_select.png",
        "text": "应用"
      },
      {
        "pagePath": "pages/main/approval/approval",
        "iconPath": "static/main/icon_main_apply_normal.png",
        "selectedIconPath": "static/main/icon_main_apply_select.png",
        "text": "工作台"
      },
      {
        "pagePath": "pages/main/msg/msg",
        "iconPath": "static/main/icon_main_msg_normal.png",
        "selectedIconPath": "static/main/icon_main_msg_select.png",
        "text": "消息"
      },
      {
        "pagePath": "pages/main/mine/mine",
        "iconPath": "static/main/icon_main_mine_normal.png",
        "selectedIconPath": "static/main/icon_main_mine_select.png",
        "text": "我的"
      }
    ]
  },
  "globalStyle": {
    "navigationBarTextStyle": "black",
    "navigationBarTitleText": "uni-app",
    "navigationBarBackgroundColor": "#F8F8F8",
    "backgroundColor": "#F8F8F8"
  },
  "uniIdRouter": {}
}

（3）home.vue

<template>
    <view class="content">
        <view class="text-area">
            <text class="title">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
            <text class="title2">{{title}}</text>
        </view>
        <tabBar class="my" tabIndex=0></tabBar>
    </view>
</template>

<script>
    import tabBar from '../../../components/tab-bar'

    export default {
        components: {
            tabBar
        },
        data() {
            return {
                title: '我是首页'
            }
        },
        onLoad() {

        },
        methods: {}
    }
</script>

<style>
.my{ width: 100vw}
.text-area {
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.title {
    font-size: 36rpx;
    color: #8f8f94;
}
.title2 {
    font-size: 36rpx;
    color: #8f8f94;
    margin-top: 300rpx;
}
</style>