小程序总结（二十一）- 基于Taro + typescript的

可选择多张图片进行上传（接口是一张一张的上传的）

<View className="textarea-title">上传照片</View>
                        <View className="patient-document-pic-box">
                            {files.map((file, index) => 
                                <View className="temp-file-pic-box" key={'file' + index}>
                                    <Image className="temp-file-pic" src={file.path}></Image>
                                    <Image className="close-icon" src='https://kano.guahao.cn/Efm199642756' onClick={this.onDeletePhoto.bind(this, index)}></Image>
                                    {this.state.showLoadingLayer && !file.isUploaded &&
                                    <View className="pic-layer">
                                        <View className="layer-loading">
                                            <View className="layer-progress"></View>
                                            {this.state.showUploadingText && <Text className="layer-text">正在上传</Text>}
                                        </View>
                                    </View>}
                                </View>
                            )}
                            {
                                this.state.files.length < 9 &&
                                <View className="camera-pic-box" onClick={this.onChooseImg.bind(this)}>
                                    <Image className="camera-pic" src='https://kano.guahao.cn/GEm199642253'></Image>
                                    <Text className="add-text">添加照片</Text>
                                </View>
                            }
                        </View>

.patient-document-pic-box, .temp-file-box {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        .temp-file-pic-box {
            position: relative;
            .temp-file-pic {
                width: 150px;
                height: 150px;
                margin-right: 20px;
                margin-bottom: 20px;
                flex-shrink: 0;
            }
            .close-icon {
                width: 40px;
                height: 40px;
                position: absolute;
                top: -20px;
                right: 0px;
                z-index: 2;
            }
            .pic-layer {
                width: 150px;
                height: 150px;
                background: rgba(0,0,0,.6);
                position: absolute;
                top: 0;
                display: flex;
                justify-content: center;
                align-items: center;
                .layer-text {
                    font-size: 18px;
                    color: #fff;
                    opacity: 0.8;
                    position: absolute;
                    left: 50%;
                    transform: translateX(-50%);
                }
                .layer-loading {
                    width: 60px;
                    height: 60px;
                    position: relative;
                    .layer-progress {
                        width: 60px;
                        height: 60px;
                        border-radius: 50%;
                        border: 5px solid #8F8E8C;
                        border-top: 5px solid #fff;
                        position: absolute;
                        left: -5rpx;
                        top: -3rpx;
                        -webkit-animation: spin 2s linear infinite;
                        animation: spin 2s linear infinite;
                    }
                    .layer-text {
                        position: absolute;
                        z-index: 2;
                        top: 50%;
                        transform: translate(-50%,-50%);
                        left: 50%;
                        word-break: keep-all;
                    }
                }
            }
        }
        .camera-pic-box {
            position: relative;
            top: -14px;
            width: 149px;
            height: 149px;
            border: 1Px solid #ddd;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            .camera-pic {
                width: 45px;
                height: 37px;
            }
            .add-text {
                font-size: 18px;
                color: #9B9B9B;
            }
        }
    }

// 关于typescript的类型定义你可以去掉
onChooseImg (): void {
        const filesLength = this.state.files.length
        this.setState({
            fileIndex: 0
        })
        if (this.state.files.length < 9) {
            Taro.chooseImage({
                sourceType: ['album', 'camera'],
                sizeType: ['compressed'],
                count: 9 - filesLength
            }).then((res:any) => {
                this.setState({
                    files: this.state.files.concat(res.tempFiles).slice(0,9)
                })
                this.setState({
                    showLoadingLayer: true,
                    showUploadingText: true,
                    showWaitingUploadText: true
                })
                // 选中图片之后就要上传
                /*这里我一开始直接遍历res.tempFiles数组，后来发现，我上传的跟我选中的图片无法对上，所以这里不能直接循环遍历选中的图片数组*/
                this.onUpload(res.tempFiles, res.tempFiles[this.state.fileIndex])
            }).catch(e=> {console.log(e)})
        } else {
            Taro.showToast({
                title: '最多只能上传9张图片！',
                icon: 'none'
            })
        }
    }
     // 这里只在本地删除
    onDeletePhoto (index:number): void {
        this.state.files.splice(index, 1)
        this.setState({
            files: this.state.files
        })
        for (let i = 0; i < this.state.recordFiles.length; i++) {
            if (index === i) {
                this.state.recordFiles.splice(index, 1)
                this.setState({
                    recordFiles: this.state.recordFiles
                })
                break;
            }
        }
    }
    onUpload (tempArr: Array<IFile>, file: IFile): void {
        const fileObj = file
    
        file && Taro.uploadFile({
            url: `这里换成你的上传图片的接口地址`,
            filePath: file.path,
            name: 'file',
            // 根据情况看是否需要传token
            header: {
                "Content-Type": "multipart/form-data",
                Authorization: 'Bearer ' + Taro.getStorageSync('UserInfo').accessToken
            },
            // complete比success先执行
            complete: () => {
                if (this.state.fileIndex === tempArr.length) {
                    this.setState((preState: any) => {
                        preState.showLoadingLayer = false
                        preState.showUploadingText = false
                        preState.showWaitingUploadText = false
                    })
                } else {
                    let { fileIndex } = this.state
                    fileIndex = fileIndex + 1 // 避免index = 0上传两次
                    this.onUpload(tempArr, tempArr[fileIndex])
                }
            },
            success: (res) => {
                let file = JSON.parse(res.data).obj
                // 控制蒙层的显示
                for (let i = 0; i < this.state.files.length; i++) {
                    if (this.state.files[i].path === fileObj.path) {
                        this.state.files[i].isUploaded = true
                        break;
                    }
                }
                this.setState((preState:any) => {
                    preState.recordFiles = preState.recordFiles.concat(file[0].url)
                    preState.fileIndex = preState.fileIndex + 1
                }, () => {
                    console.log('success fileIndex = ', this.state.fileIndex)
                })
            }
        })
    }

需要在state中定义的数据：

state = {
  files: [],
  recordFiles: [],
  showLoadingLayer: false,
  showUploadingText: false,
  fileIndex: 0 // 当前上传的图片索引
}