[__NSCFArray objectForKey:]: unrecognized selector sent to instance

Question

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 \"

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Answer 1

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.

Answer 2

Try this:

 NSMutableDictionary *dct =[avatars objectAtIndex:0];

 NSDictionary *avatarimage = [dct objectForKey:@"- image"];

 NSString *name = [dct objectForKey:@"name"];

Answer 3

The reason you see that is because avatars is not a NSDictionary but is a NSArray instead.

I can tell because:

• the exception you get tells that __NSCFArray (i.e. NSArray) doesn't recognize the objectForKey: selector

• when logging avatars it prints also parenthesis (. An array is logged in this way:

  ( first element, second element, … )

while a dictionary gets logged in this way:

{
  firstKey = value,
  secondKey = value,
  …
}

You can fix this in this way:

NSArray *avatars = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSLog(@"response:::%@", avatars);
if(avatars){
    NSDictionary *avatar = [avatars objectAtIndex:0]; // or avatars[0]
    NSDictionary *avatarimage = [avatar objectForKey:@"- image"];
    NSString *name = [avatar objectForKey:@"name"];
}

Also note that the key for the avatarImage is wrong.