在 Block 运行之前返回 NSString 值 [英] NSString value returning before Block has run

问题描述

我正在尝试使用在块外的块(fid")内生成的值.问题是该值在块运行之前被拉取，因此即使数据存在，该值仍返回为 (null).有谁知道我怎样才能做到这一点?见代码:

I'm trying to use a value generated inside of a block ("fid") outside of a block. The problem being that the value is being pulled before the block has run, and so the value returns as (null), even though the data is present. Does anyone know how I can make this work? See code:

.h

@property (nonatomic, strong) NSString *fid;

.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!");
}];

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"];

推荐答案

移动代码块内的代码

[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);
  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"];


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

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