331 lines
		
	
	
		
			9.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			331 lines
		
	
	
		
			9.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <template>
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| 	<view v-if="show" class="u-tabbar" @touchmove.stop.prevent="() => {}">
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| 		<view class="u-tabbar__content safe-area-inset-bottom" :style="{
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| 			height: $u.addUnit(height),
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| 			backgroundColor: bgColor,
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| 		}" :class="{
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| 			'u-border-top': borderTop
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| 		}">
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| 			<view class="u-tabbar__content__item" v-for="(item, index) in list" :key="index" :class="{
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| 				'u-tabbar__content__circle': midButton &&item.midButton
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| 			}" @tap.stop="clickHandler(index)" :style="{
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| 				backgroundColor: bgColor
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| 			}">
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| 				<view :class="[
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| 					midButton && item.midButton ? 'u-tabbar__content__circle__button' : 'u-tabbar__content__item__button'
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| 				]">
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| 					<u-icon
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| 						:size="midButton && item.midButton ? midButtonSize : iconSize"
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| 						:name="elIconPath(index)"
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| 						img-mode="scaleToFill"
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| 						:color="elColor(index)"
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| 						:custom-prefix="item.customIcon ? 'custom-icon' : 'uicon'"
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| 					></u-icon>
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| 					<u-badge :count="item.count" :is-dot="item.isDot"
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| 						v-if="item.count || item.isDot"
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| 						:offset="[-2, getOffsetRight(item.count, item.isDot)]"
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| 					></u-badge>
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| 				</view>
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| 				<view class="u-tabbar__content__item__text" :style="{
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| 					color: elColor(index)
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| 				}">
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| 					<text class="u-line-1">{{item.text}}</text>
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| 				</view>
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| 			</view>
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| 			<view v-if="midButton" class="u-tabbar__content__circle__border" :class="{
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| 				'u-border': borderTop,
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| 			}" :style="{
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| 				backgroundColor: bgColor,
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| 				left: midButtonLeft
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| 			}">
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| 			</view>
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| 		</view>
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| 		<!-- 这里加上一个48rpx的高度,是为了增高有凸起按钮时的防塌陷高度(也即按钮凸出来部分的高度) -->
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| 		<view class="u-fixed-placeholder safe-area-inset-bottom" :style="{
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| 				height: `calc(${$u.addUnit(height)} + ${midButton ? 48 : 0}rpx)`,
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| 			}"></view>
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| 	</view>
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| </template>
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| 
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| <script>
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| 	export default {
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| 		props: {
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| 			// 显示与否
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| 			show: {
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| 				type: Boolean,
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| 				default: true
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| 			},
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| 			// 通过v-model绑定current值
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| 			value: {
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| 				type: [String, Number],
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| 				default: 0
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| 			},
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| 			// 整个tabbar的背景颜色
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| 			bgColor: {
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| 				type: String,
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| 				default: '#ffffff'
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| 			},
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| 			// tabbar的高度,默认50px,单位任意,如果为数值,则为rpx单位
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| 			height: {
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| 				type: [String, Number],
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| 				default: '50px'
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| 			},
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| 			// 非凸起图标的大小,单位任意,数值默认rpx
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| 			iconSize: {
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| 				type: [String, Number],
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| 				default: 40
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| 			},
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| 			// 凸起的图标的大小,单位任意,数值默认rpx
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| 			midButtonSize: {
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| 				type: [String, Number],
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| 				default: 90
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| 			},
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| 			// 激活时的演示,包括字体图标,提示文字等的演示
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| 			activeColor: {
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| 				type: String,
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| 				default: '#303133'
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| 			},
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| 			// 未激活时的颜色
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| 			inactiveColor: {
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| 				type: String,
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| 				default: '#606266'
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| 			},
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| 			// 是否显示中部的凸起按钮
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| 			midButton: {
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| 				type: Boolean,
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| 				default: false
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| 			},
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| 			// 配置参数
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| 			list: {
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| 				type: Array,
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| 				default () {
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| 					return []
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| 				}
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| 			},
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| 			// 切换前的回调
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| 			beforeSwitch: {
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| 				type: Function,
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| 				default: null
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| 			},
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| 			// 是否显示顶部的横线
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| 			borderTop: {
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| 				type: Boolean,
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| 				default: true
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| 			},
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| 			// 是否隐藏原生tabbar
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| 			hideTabBar: {
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| 				type: Boolean,
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| 				default: true
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| 			},
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| 		},
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| 		data() {
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| 			return {
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| 				// 由于安卓太菜了,通过css居中凸起按钮的外层元素有误差,故通过js计算将其居中
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| 				midButtonLeft: '50%',
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| 				pageUrl: '', // 当前页面URL
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| 			}
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| 		},
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| 		created() {
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| 			// 是否隐藏原生tabbar
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| 			if(this.hideTabBar) uni.hideTabBar();
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| 			// 获取引入了u-tabbar页面的路由地址,该地址没有路径前面的"/"
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| 			let pages = getCurrentPages();
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| 			// 页面栈中的最后一个即为项为当前页面,route属性为页面路径
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| 			this.pageUrl = pages[pages.length - 1].route;
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| 		},
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| 		computed: {
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| 			elIconPath() {
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| 				return (index) => {
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| 					// 历遍u-tabbar的每一项item时,判断是否传入了pagePath参数,如果传入了
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| 					// 和data中的pageUrl参数对比,如果相等,即可判断当前的item对应当前的tabbar页面,设置高亮图标
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| 					// 采用这个方法,可以无需使用v-model绑定的value值
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| 					let pagePath = this.list[index].pagePath;
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| 					// 如果定义了pagePath属性,意味着使用系统自带tabbar方案,否则使用一个页面用几个组件模拟tabbar页面的方案
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| 					// 这两个方案对处理tabbar item的激活与否方式不一样
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| 					if(pagePath) {
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| 						if(pagePath == this.pageUrl || pagePath == '/' + this.pageUrl) {
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| 							return this.list[index].selectedIconPath;
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| 						} else {
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| 							return this.list[index].iconPath;
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| 						}
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| 					} else {
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| 						// 普通方案中,索引等于v-model值时,即为激活项
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| 						return index == this.value ? this.list[index].selectedIconPath : this.list[index].iconPath
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| 					}
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| 				}
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| 			},
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| 			elColor() {
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| 				return (index) => {
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| 					// 判断方法同理于elIconPath
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| 					let pagePath = this.list[index].pagePath;
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| 					if(pagePath) {
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| 						if(pagePath == this.pageUrl || pagePath == '/' + this.pageUrl) return this.activeColor;
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| 						else return this.inactiveColor;
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| 					} else {
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| 						return index == this.value ? this.activeColor : this.inactiveColor;
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| 					}
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| 				}
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| 			}
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| 		},
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| 		mounted() {
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| 			this.midButton && this.getMidButtonLeft();
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| 		},
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| 		methods: {
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| 			async clickHandler(index) {
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| 				if(this.beforeSwitch && typeof(this.beforeSwitch) === 'function') {
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| 					// 执行回调,同时传入索引当作参数
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| 					// 在微信,支付宝等环境(H5正常),会导致父组件定义的customBack()函数体中的this变成子组件的this
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| 					// 通过bind()方法,绑定父组件的this,让this.customBack()的this为父组件的上下文
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| 					let beforeSwitch = this.beforeSwitch.bind(this.$u.$parent.call(this))(index);
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| 					// 判断是否返回了promise
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| 					if (!!beforeSwitch && typeof beforeSwitch.then === 'function') {
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| 						await beforeSwitch.then(res => {
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| 							// promise返回成功,
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| 							this.switchTab(index);
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| 						}).catch(err => {
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| 
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| 						})
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| 					} else if(beforeSwitch === true) {
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| 						// 如果返回true
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| 						this.switchTab(index);
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| 					}
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| 				} else {
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| 					this.switchTab(index);
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| 				}
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| 			},
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| 			// 切换tab
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| 			switchTab(index) {
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| 				// 发出事件和修改v-model绑定的值
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| 				this.$emit('change', index);
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| 				// 如果有配置pagePath属性,使用uni.switchTab进行跳转
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| 				if(this.list[index].pagePath) {
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| 					uni.switchTab({
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| 						url: this.list[index].pagePath
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| 					})
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| 				} else {
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| 					// 如果配置了papgePath属性,将不会双向绑定v-model传入的value值
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| 					// 因为这个模式下,不再需要v-model绑定的value值了,而是通过getCurrentPages()适配
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| 					this.$emit('input', index);
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| 				}
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| 			},
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| 			// 计算角标的right值
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| 			getOffsetRight(count, isDot) {
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| 				// 点类型,count大于9(两位数),分别设置不同的right值,避免位置太挤
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| 				if(isDot) {
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| 					return -20;
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| 				} else if(count > 9) {
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| 					return -40;
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| 				} else {
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| 					return -30;
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| 				}
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| 			},
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| 			// 获取凸起按钮外层元素的left值,让其水平居中
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| 			getMidButtonLeft() {
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| 				let windowWidth = this.$u.sys().windowWidth;
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| 				// 由于安卓中css计算left: 50%的结果不准确,故用js计算
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| 				this.midButtonLeft = (windowWidth / 2) + 'px';
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| 			}
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| 		}
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| 	}
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| </script>
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| 
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| <style scoped lang="scss">
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| 	@import "../../libs/css/style.components.scss";
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| 	.u-fixed-placeholder {
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| 		/* #ifndef APP-NVUE */
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| 		box-sizing: content-box;
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| 		/* #endif */
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| 	}
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| 
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| 	.u-tabbar {
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| 
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| 		&__content {
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| 			@include vue-flex;
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| 			align-items: center;
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| 			position: relative;
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| 			position: fixed;
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| 			bottom: 0;
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| 			left: 0;
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| 			width: 100%;
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| 			z-index: 998;
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| 			/* #ifndef APP-NVUE */
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| 			box-sizing: content-box;
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| 			/* #endif */
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| 
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| 			&__circle__border {
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| 				border-radius: 100%;
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| 				width: 110rpx;
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| 				height: 110rpx;
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| 				top: -48rpx;
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| 				position: absolute;
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| 				z-index: 4;
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| 				background-color: #ffffff;
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| 				// 由于安卓的无能,导致只有3个tabbar item时,此css计算方式有误差
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| 				// 故使用js计算的形式来定位,此处不注释,是因为js计算有延后,避免出现位置闪动
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| 				left: 50%;
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| 				transform: translateX(-50%);
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| 
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| 				&:after {
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| 					border-radius: 100px;
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| 				}
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| 			}
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| 
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| 			&__item {
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| 				flex: 1;
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| 				justify-content: center;
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| 				height: 100%;
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| 				padding: 12rpx 0;
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| 				@include vue-flex;
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| 				flex-direction: column;
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| 				align-items: center;
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| 				position: relative;
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| 
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| 				&__button {
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| 					position: absolute;
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| 					top: 14rpx;
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| 					left: 50%;
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| 					transform: translateX(-50%);
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| 				}
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| 
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| 				&__text {
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| 					color: $u-content-color;
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| 					font-size: 26rpx;
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| 					line-height: 28rpx;
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| 					position: absolute;
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| 					bottom: 14rpx;
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| 					left: 50%;
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| 					transform: translateX(-50%);
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| 					width: 100%;
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| 					text-align: center;
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| 				}
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| 			}
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| 
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| 			&__circle {
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| 				position: relative;
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| 				@include vue-flex;
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| 				flex-direction: column;
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| 				justify-content: space-between;
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| 				z-index: 10;
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| 				/* #ifndef APP-NVUE */
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| 				height: calc(100% - 1px);
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| 				/* #endif */
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| 
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| 				&__button {
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| 					width: 90rpx;
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| 					height: 90rpx;
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| 					border-radius: 100%;
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| 					@include vue-flex;
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| 					justify-content: center;
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| 					align-items: center;
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| 					position: absolute;
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| 					background-color: #ffffff;
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| 					top: -40rpx;
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| 					left: 50%;
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| 					z-index: 6;
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| 					transform: translateX(-50%);
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| 				}
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| 			}
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| 		}
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| 	}
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| </style>
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