如何在ioS中从PHPhotoLibrary获取引用url？

// 检查访问权限
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusAuthorized) {
    // 已授权，获取引用URL
    [self fetchReferenceURL];
} else if (status == PHAuthorizationStatusNotDetermined) {
    // 未确定权限，请求权限
    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
        if (status == PHAuthorizationStatusAuthorized) {
            // 获取引用URL
            [self fetchReferenceURL];
        } else {
            // 用户拒绝授权
        }
    }];
} else {
    // 用户拒绝授权或权限受限
}

- (void)fetchReferenceURL {
    PHFetchOptions *options = [[PHFetchOptions alloc] init];
    PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:options];
    if (result.count > 0) {
        PHAsset *asset = result.firstObject;
        PHContentEditingInputRequestOptions *requestOptions = [[PHContentEditingInputRequestOptions alloc] init];
        [asset requestContentEditingInputWithOptions:requestOptions completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {
            NSURL *referenceURL = contentEditingInput.fullSizeImageURL;
            // 使用引用URL进行后续操作
        }];
    } else {
        // 照片库中没有图片
    }
}