[__NSCFArray objectForKey：]：无法识别的选择器发送到实例 [英] [__NSCFArray objectForKey:]: unrecognized selector sent to instance

问题描述

我想从字典中获取特定键的值，但我得到一个[__NSCFArray objectForKey：]：无法识别的选择器发送到实例

   - （void）connectionDidFinishLoading：（NSURLConnection *）connection {
 NSDictionary * avatars = [NSJSONSerialization JSONObjectWithData：webData options：0 error：nil]; 
 NSLog（@response :::％@，avatars）; 
 if（avatars）{
 NSDictionary * avatarimage = [avatars objectForKey：@ -  image]; 
 NSString * name = [avatars objectForKey：@name]; 
} 
} 
  

我NSLog我的化身字典，我的结果是： / p>

 （
 {
created_at=2013-06-06T11：37：48Z; 
 id = 7; 
 image = {
 thumb = {
 url =/uploads/avatar/image/7/thumb_304004-1920x1080.jpg; 
}; 
 url =/uploads/avatar/image/7/304004-1920x1080.jpg; 
}; 
 name = Drogba; 
updated_at=2013-06- 06T11：37：48Z; 
} 
）
  

解决方案

问题是你有一个 NSArray 不是 NSDictionary 。 NSArray 的计数为1，并包含 NSDictionary 。

  NSArray * wrapper = [NSJSONSerialization JSONObjectWithData：webData options：0 error：nil]; 
 NSDictionary * avatars = [wrapper objectAtIndex：0]; 
  
 
 
 
 
 
 
要遍历数组中的所有项，数组。
  NSArray * avatars = [NSJSONSerialization JSONObjectWithData：webData options：0 error：nil]; 
 
 for（NSDictionary * avatar in avatars）{
 NSDictionary * avatarimage = avatar [@image]; 
 NSString * name = avatar [@name]; 
 
 //您的代码的剩余
} 
  
 ：我也从 -objectForKey：切换到[]语法。我更喜欢这个。
 
I am trying to get a value for a particular key from a dictionary but i get a "[__NSCFArray objectForKey:]: unrecognized selector sent to instance " 
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSDictionary *avatars = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSLog(@"response:::%@", avatars);
if(avatars){
    NSDictionary *avatarimage = [avatars objectForKey:@"- image"];
    NSString *name = [avatars objectForKey:@"name"];
}
}
I NSLog my avatars Dictionary and my result is:
(
{
    "created_at" = "2013-06-06T11:37:48Z";
    id = 7;
    image =         {
        thumb =             {
            url = "/uploads/avatar/image/7/thumb_304004-1920x1080.jpg";
        };
        url = "/uploads/avatar/image/7/304004-1920x1080.jpg";
    };
    name = Drogba;
    "updated_at" = "2013-06-06T11:37:48Z";
}
)

解决方案
The problem is you have a NSArray not an NSDictionary. The NSArray has a count of 1 and contains an NSDictionary.
NSArray *wrapper= [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSDictionary *avatars = [wrapper objectAtIndex:0];




To loop through all items in the array, enumerate the array.
NSArray *avatars= [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];

for (NSDictionary *avatar in avatars) {
    NSDictionary *avatarimage = avatar[@"image"];
    NSString *name = avatar[@"name"];

    // THE REST OF YOUR CODE
}
NOTE: I also switched from -objectForKey: to [] syntax. I like that better.

                        
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