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.
