iOSSDK文档1.0中ListObjects方法中遇到问题求助

iOS SDK文档1.0中 List Objects方法中遇到问题


ListObjectOption *opt = [[ListObjectOption alloc] init];
[opt setDelimiter:@"/"];
[opt setPrefix:@"prefixdir/"];
[opt setMaxKeys:500];
[opt setMarker:@"prefix187"];
NSError *error = nil;
ListObjectResult *result = [sampleBucket listObjectsInBucket:opt error:&error]; // 调用接口罗列Bucket中的Objects
int objectNum = result.objectList.count;
NSString *nextMarkder = result.nextMarker;
BOOL isTruncated = result.isTruncated;
NSArray *objectList = result.objectList; // 获取返回结果中的Objects列表
for (ObjectInfo *ele in objectList) { // 遍历返回的Objects列表
    NSString *objectKey = ele.objectKey;
    NSString *lastModifiedTime = ele.lastModified;
}

其中ObjectInfo 类出自哪，未找到该类
哪位大神帮忙解答一下