uni-app下拉刷新、上拉加载更多实现_uniapp 下拉更多

下拉刷新

下拉刷新文档
在 js 中定义 onPullDownRefresh 处理函数（和onLoad等生命周期函数同级），监听该页面用户下拉刷新事件。
需要在 pages.json 里，找到的当前页面的pages节点，并在 style 选项中开启 enablePullDownRefresh:true。
当处理完数据刷新后，uni.stopPullDownRefresh 可以停止当前页面的下拉刷新。

实例

pages.json

{
    "pages": [
        {
            "path": "pages/index/index",
            "style": {
                "navigationBarTitleText": "标题名称",
				// App 和 小程序都开启下拉刷新
                "enablePullDownRefresh": true
            }
        }
    ],
    "globalStyle": {
        "navigationBarTextStyle": "white",
        "navigationBarBackgroundColor": "#0faeff",
        "backgroundColor": "#fbf9fe"
    }
}


index.vue
// 仅做示例，实际开发中延时根据需求来使用。
export default {
    data: {
        text: 'uni-app'
    },
    onLoad: function (options) {
        setTimeout(function () {
            console.log('start pulldown');
        }, 1000);
        uni.startPullDownRefresh();
    },
    onPullDownRefresh() {
        console.log('refresh');
        setTimeout(function () {
            uni.stopPullDownRefresh();
        }, 1000);
    }
}
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上拉加载

• 导入官方的一个上拉加载自定义组件

在 components 目录下（和 page 目录同级）新建一个 uni-load-more 文件夹，
然后创建一个文件 uni-load-more.vue

uni-load-more.vue 完整文件如下：

<template>
	<view class="uni-load-more">
		<view v-show="status === 'loading' && showIcon" class="uni-load-more__img">
			<view class="load1">
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
			</view>
			<view class="load2">
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
			</view>
			<view class="load3">
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
				<view :style="{background:color}" />
			</view>
		</view>
		<text :style="{color:color}" class="uni-load-more__text">{{ status === 'more' ? contentText.contentdown : (status === 'loading' ? contentText.contentrefresh : contentText.contentnomore) }}</text>
	</view>
</template>

<script>
	export default {
		name: 'UniLoadMore',
		props: {
			status: {
				// 上拉的状态：more-loading前；loading-loading中；noMore-没有更多了
				type: String,
				default: 'more'
			},
			showIcon: {
				type: Boolean,
				default: true
			},
			color: {
				type: String,
				default: '#777777'
			},
			contentText: {
				type: Object,
				default () {
					return {
						contentdown: '上拉显示更多',
						contentrefresh: '正在加载...',
						contentnomore: '没有更多数据了'
					}
				}
			}
		},
		data() {
			return {}
		}
	}
</script>

<style>
	@charset "UTF-8";

	.uni-load-more {
		display: flex;
		flex-direction: row;
		height: 80upx;
		align-items: center;
		justify-content: center
	}

	.uni-load-more__text {
		font-size: 28upx;
		color: #999
	}

	.uni-load-more__img {
		height: 24px;
		width: 24px;
		margin-right: 10px
	}

	.uni-load-more__img>view {
		position: absolute
	}

	.uni-load-more__img>view view {
		width: 6px;
		height: 2px;
		border-top-left-radius: 1px;
		border-bottom-left-radius: 1px;
		background: #999;
		position: absolute;
		opacity: .2;
		transform-origin: 50%;
		animation: load 1.56s ease infinite
	}

	.uni-load-more__img>view view:nth-child(1) {
		transform: rotate(90deg);
		top: 2px;
		left: 9px
	}

	.uni-load-more__img>view view:nth-child(2) {
		transform: rotate(180deg);
		top: 11px;
		right: 0
	}

	.uni-load-more__img>view view:nth-child(3) {
		transform: rotate(270deg);
		bottom: 2px;
		left: 9px
	}

	.uni-load-more__img>view view:nth-child(4) {
		top: 11px;
		left: 0
	}

	.load1,
	.load2,
	.load3 {
		height: 24px;
		width: 24px
	}

	.load2 {
		transform: rotate(30deg)
	}

	.load3 {
		transform: rotate(60deg)
	}

	.load1 view:nth-child(1) {
		animation-delay: 0s
	}

	.load2 view:nth-child(1) {
		animation-delay: .13s
	}

	.load3 view:nth-child(1) {
		animation-delay: .26s
	}

	.load1 view:nth-child(2) {
		animation-delay: .39s
	}

	.load2 view:nth-child(2) {
		animation-delay: .52s
	}

	.load3 view:nth-child(2) {
		animation-delay: .65s
	}

	.load1 view:nth-child(3) {
		animation-delay: .78s
	}

	.load2 view:nth-child(3) {
		animation-delay: .91s
	}

	.load3 view:nth-child(3) {
		animation-delay: 1.04s
	}

	.load1 view:nth-child(4) {
		animation-delay: 1.17s
	}

	.load2 view:nth-child(4) {
		animation-delay: 1.3s
	}

	.load3 view:nth-child(4) {
		animation-delay: 1.43s
	}

	@-webkit-keyframes load {
		0% {
			opacity: 1
		}

		100% {
			opacity: .2
		}
	}
</style>
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• 导入自定义的上拉加载组件，监听上拉加载，修改上拉加载的状态

完整的使用例子如下：

<template>
	<view>
		<view>
			<block v-for="(item , index) in list_array" :key="index">
				<view>{{ item }}</view>
			</block>
		</view>
		
		<view>
			<uni-load-more :status="status"  :content-text="contentText" color="#007aff"  />
		</view>
	</view>
</template>

<script>
	import uniLoadMore from '@/components/uni-load-more/uni-load-more.vue'

	export default {
		data() {
			return {
				list_array: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18',
					'19',
					'20','1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15'
				],
				status: 'more',
				statusTypes: [{
					value: 'more',
					text: '加载前'
				}, {
					value: 'loading',
					text: '加载中'
				}, {
					value: 'noMore',
					text: '没有更多'
				}],
				contentText: {
					contentdown: '查看更多',
					contentrefresh: '加载中',
					contentnomore: '没有更多'
				}
			}
		},
		components: {
			uniLoadMore
		},
		onLoad: function(options) {
			setTimeout(function() {
				console.log('start pulldown');
			}, 1000);
			uni.startPullDownRefresh();
		},
		// 下拉刷新
		onPullDownRefresh() {
			console.log('refresh');
			setTimeout(function() {
				uni.stopPullDownRefresh();
			}, 1000);
		},
		// 上拉加载
		onReachBottom() {
			let _self = this
			this.status = 'loading'
			uni.showNavigationBarLoading()
			
			console.log('reach');
			setTimeout(function() {
				for (var i = 0; i < 10; i++) {
					_self.list_array.push("000" + i)
				}
				_self.status = 'more'
				uni.hideNavigationBarLoading()
			}, 2000);
		},
		methods: {

		}
	}
</script>

<style>
	page {
		display: flex;
		flex-direction: column;
		box-sizing: border-box;
		background-color: #fff
	}

	view {
		font-size: 28upx;
		line-height: inherit
	}

	.example {
		padding: 0 30upx 30upx
	}

	.example-title {
		font-size: 32upx;
		line-height: 32upx;
		color: #777;
		margin: 40upx 25upx;
		position: relative
	}

	.example .example-title {
		margin: 40upx 0
	}

	.example-body {
		padding: 0 40upx
	}

	uni-radio-group uni-label {
		padding: 0;
	}

	.uni-list-item__container {
		padding: 24upx 30upx;
		width: 100%;
		box-sizing: border-box;
		flex: 1;
		position: relative;
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
	}

	.uni-list-item__container:after {
		position: absolute;
		z-index: 3;
		right: 0;
		bottom: 0;
		left: 30upx;
		height: 1px;
		content: '';
		-webkit-transform: scaleY(.5);
		transform: scaleY(.5);
		background-color: #c8c7cc;
	}
</style>

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