OSS IOS SDK 只获取Object的Meta信息

详细解答可以参考官方帮助文档

下面代码用于获取Object的元信息：

OSSHeadObjectRequest * head = [OSSHeadObjectRequest new];
head.bucketName = @"<bucketName>";
head.objectKey = @"<objectKey>";
OSSTask * headTask = [client headObject:head];
[headTask continueWithBlock:^id(OSSTask *task) {
    if (!task.error) {
        OSSHeadObjectResult * headResult = task.result;
        NSLog(@"all response header: %@", headResult.httpResponseHeaderFields);
        // some object properties include the 'x-oss-meta-*'s
        NSLog(@"head object result: %@", headResult.objectMeta);
    } else {
        NSLog(@"head object error: %@", task.error);
    }
    return nil;
}];