Question

我已将名为“fid”的NSString的值设置为responseObject（参见下文）。 responseObject在NSLog'd时返回我想要的数据，但由于某种原因，当我NSLog进一步向下时，它是空的。我错过了什么吗？见代码：

·H

@property (nonatomic, assign) NSString *fid;

的.m

[DIOSFile fileSave:file success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"File uploaded!");

    [file setObject:[responseObject objectForKey:@"fid"] forKey:@"fid"];
    [file removeObjectForKey:@"file"];

 fid = [responseObject objectForKey:@"fid"];
        NSLog(@"%@",responseObject);

 } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
     NSLog(@"Failed to upload file!");
  }];

    NSDictionary *bodyValues = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:_itemDescrip.text, nil] forKeys:[NSArray arrayWithObjects:@"value", nil]];
    NSDictionary *languageDict = [NSDictionary dictionaryWithObject:[NSArray arrayWithObject:bodyValues] forKey:@"und"];
    [nodeData setObject:languageDict forKey:@"body"];

    [nodeData setObject:@"storage_item" forKey:@"type"];

    NSMutableDictionary *dict = [NSMutableDictionary dictionary];

    [dict setObject: [NSString stringWithFormat:@"%@", fid] forKey:@"fid"];
    NSLog(@"%@", fid);

    NSDictionary *fidLangDict = [NSDictionary dictionaryWithObject:[NSArray arrayWithObject:dict] forKey:@"und"];

    [nodeData setObject:fidLangDict forKey:@"field_photo"];

    [DIOSNode nodeSave:nodeData success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Node saved!");


    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Node did not save!");
    }];

Answer 1

您正在调用异步方法。

日志语句“进一步向下”在fileSave方法完成之前很久就被执行了。 fileSave的两个回调将在遥远的未来某个时间被调用（可能是从现在开始的几秒钟）。

无论你想做什么，fid都必须在fileSave的完成块中完成。

NSString的值返回null，但不确定为什么？

1 个答案: