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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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10-27 15:35