效果图

点击加号，选择图片

点击右下角确定

代码展示

将uni-file-picker组件和ksp-cropper组件修改，二次封装

（在上传时，使用了我自己的接口，可替换）

uni-file-picker组件和ksp-cropper组件下载地址，如下：

uni-file-picker 文件选择上传 - DCloud 插件市场

ksp-cropper - DCloud 插件市场

组件代码

<template>
	<view>
		<uni-file-picker :limit="limit" mode="grid" :fileMediatype="fileMediatype" :file-extname="fileType"
			@progress="progress" @success="success" @fail="fail" @select="select" @delete="delIMG"
			v-model="dataList"></uni-file-picker>
		<ksp-cropper v-if="localDataShowCropper" class="crop" mode="fixed" :width="250" :height="250" :maxWidth="1024"
			:maxHeight="1024" :url="currentImageUrl" @cancel="handleCancel" @ok="handleCropOk"></ksp-cropper>
	</view>
</template>

<script>
	export default {
		name: "sk-upload-crop",
		props: {
			limit: {
				type: Number,
				default: 1
			},
			fileType: {
				type: Array,
				default: function() {
					return []
				}
			},
			type: {
				type: Number
			},
			// 默认数据，逗号隔开(用于保存和回显数据)
			modelValue: {
				type: String,
				default: ''
			},

			showCropper: {
				type: Boolean,
				default: false
			}
		},

		data() {
			return {
				// 用于展示数据
				dataList: [],
				fileMediatype: 'all',
				currentImageUrl: '',
				localDataShowCropper: this.showCropper,
			};
		},

		created() {
			let _this = this
			const temList = _this.$util.isNull(_this.modelValue) ? [] : _this.modelValue.split(',')
			temList.forEach((item, i) => {
				_this.dataList.push({
					'url': _this.$config.getConfig().fileBasePath + item
				})
			})
			if (_this.fileType.indexOf("png") > -1) {
				_this.fileMediatype = "image"
			}
		},

		methods: {
			select(e) {
				const tempFilePaths = e.tempFilePaths;
				if (tempFilePaths && tempFilePaths.length > 0) {
					this.currentImageUrl = tempFilePaths[0];
					this.localDataShowCropper = true;
				}
			},

			handleCropOk(currentImageUrl) {
				console.log('currentImageUrl',currentImageUrl)
				let _this = this
				let list = _this.$util.isNull(_this.modelValue) ? [] : _this.modelValue.split(',')
				let dataList = _this.dataList
				uni.uploadFile({
					url: _this.$config.getConfig().reqBasePath + 'common003',
					filePath: currentImageUrl.path,
					name: 'imgUrl',
					header: {
						"requestType": "2",
						"userToken": uni.getStorageSync("userToken")
					},
					formData: {
						type: 37,
					},
					success: (res) => {
						if (res.statusCode == 200) {
							var jsonData = JSON.parse(res.data);
							if (jsonData.returnCode == 0) {
								let bean = jsonData.bean
								dataList.push({
									'url': _this.$config.getConfig().fileBasePath + bean.picUrl
								})
								list.push(bean.picUrl)
								_this.dataList = dataList
								_this.$emit('update:modelValue', list.toString());
							} else {
								uni.showToast({
									icon: 'none',
									position: 'bottom',
									title: jsonData.returnMessage
								});
							}
						}
					}
				});
				this.localDataShowCropper = false;
			},

			handleCancel() {
				this.clearData()
			},

			clearData() {
				this.dataList = [];
				this.currentImageUrl = '';
			},

			// 图片删除
			delIMG(e) {
				// 删除显示的数据
				const num = this.dataList.findIndex(v => v.url === e.tempFilePath);
				this.dataList.splice(num, 1);
				// 删除保存的数据
				let list = this.$util.isNull(this.modelValue) ? [] : this.modelValue.split(',')
				const savePath = e.tempFilePath.replace(this.$config.getConfig().fileBasePath, '')
				const num1 = list.findIndex(v => v === savePath);
				list.splice(num1, 1);
				this.$emit('update:modelValue', list.toString());
			},

			// 获取上传进度
			progress(e) {
				console.log('上传进度：', e)
			},

			// 上传成功
			success(e) {
				console.log('上传成功')
			},

			// 上传失败
			fail(e) {
				console.log('上传失败：', e)
			}
		}
	}
</script>

<style scoped>
	::v-deep .is-add {
		background-color: white;
	}

	.crop {
		position: fixed;
		left: 0px;
		z-index: 100;
	}
</style>

父页面使用

<SkUploadCrop ref="uploadCrop" v-else class="pic" :type="37" :limit="1"
						:fileType="$fileType.imageType" :showCropper="isShowingCropper" v-model="formData.img">
					</SkUploadCrop>