注意点
1、获取该PHAsset是否为LivePhoto
应该使用asset.mediaSubtypes.contains(.photoLive)，而不是使用 asset.mediaSubtypes == .photoLive，因为枚举值是位运算

列表如何区分是否是live photo

PHAsset-mediaSubtypes → 2^3 = 8

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系统角标

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live photo 如何播放

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接口

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导出mov

/// 获取livePhoto 资源 视频路径
    /// - Parameters:
    ///   - asset: PHAsset
    ///   - result: 结果回调
    func getLivePhotoMovFilePath(_ asset: PHAsset, result: @escaping (String?, PHAsset) -> Void) {
        let assetResources = PHAssetResource.assetResources(for: asset)
        let resource = assetResources.last(where: {$0.type == .pairedVideo || $0.type == .video})
        var fileName = "\(asset.localIdentifier).mov"
        if let name = resource?.originalFilename {
            fileName = name
        }
        if asset.mediaSubtypes.contains(.photoLive) {
            let options = PHVideoRequestOptions()
            options.version = .current
            options.deliveryMode = .highQualityFormat
            // 创建文件夹路径
            let creater: (URL) -> Void = { dir in
                if !FileManager.default.fileExists(atPath: dir.path) {
                    do {
                        try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
                    } catch {
                        Log.error(error.localizedDescription)
                    }
                }
            }
            creater(livePhotoDirectory)
            let filePah = livePhotoDirectory.path.appendingPathComponent(fileName)
            
            // 是否已有此文件
            if FileManager.default.fileExists(atPath: filePah) {
                Log.info("导出LivePhoto内部Mov - 成功 - 此资源本地已导出")
                result(filePah, asset)
                return
            }
            
            guard let resource = resource else {
                result(nil, asset)
                Log.info("导出LivePhoto内部Mov - 失败 - error - resource为空")
                return
            }
            
            PHAssetResourceManager.default().writeData(for: resource, toFile: URL.init(fileURLWithPath: filePah), options: nil) { error in
                DispatchQueue.main.async {
                    if error != nil {
                        result(nil, asset)
                        Log.info("导出LivePhoto内部Mov - 失败 - error - \(error?.localizedDescription ?? "")")
                    } else {
                        result(filePah, asset)
                        Log.info("导出LivePhoto内部Mov - 成功 - filePaht - \(filePah)")
                    }
                }
            }
        } else {
            result(nil, asset)
            Log.info("导出LivePhoto内部Mov - 失败 - error - 非LivePhoto")
        }
    }