json – [__ NSCFArray objectForKey：]：发送到实例的无法识别的选择器

我试图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我的头像字典,我的结果是：

(
{
    "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";
}
)

解决方法

问题是你有一个NSArray而不是NSDictionary. NSArray的计数为1,包含NSDictionary.

NSArray *wrapper= [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSDictionary *avatars = [wrapper objectAtIndex:0];

要循环遍历数组中的所有项,请枚举数组.

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
}

注意：我也从-objectForKey：切换到[]语法.我更喜欢这样.