ios - 'NSInvalidArgumentException'，原因 : '-[__NSCFString objectAtIndex:]: unrecognized selector sent to instance

Question

下面是我的代码

   nameLabel.text=[[[dict_Details objectForKey:@"unknown_object"] objectAtIndex:0] objectForKey:@"UserFullName"];

这是我的回复

获取用户评论响应

{
"status_code" = 200;
"unknown_object" = "[{ID:227,ServiceProviderName:Dr.KarthikMendi,UserFullName:karthik,ReviewTemplateID:19,TotalScore:88.0,ServiceName:Doctor,Review:Very knowlegable doctor he understands the problem very well.,ServiceID:5,CommentsBySP:Thank you...,ServiceProviderID:0,CommentByAdmin:null,UserID:106,Status:true,CreatedDate:2016-05-06T18:30:08,Services:null,ServiceProviderTypes:null},{ID:168,ServiceProviderName:Dr.KarthikMendi,UserFullName:karthik,ReviewTemplateID:19,TotalScore:92.0,ServiceName:Doctor,Review:I am very impressed.  Very organized and professional.\\r\\nI always leave feeling taken care of and medical needs met. \\r\\nNeed more Dr\U00e2\U0080\U0099s like him!\\r\\nGreat!  He gave me sufficient time!\\r\\nVery friendly, informed and hospitable. \\r\\nVery nice \U00e2\U0080\U0093 didn\U00e2\U0080\U0099t feel like a number, but an actual person.,ServiceID:5,CommentsBySP:Thank you,ServiceProviderID:0,CommentByAdmin:null,UserID:84,Status:true,CreatedDate:2016-03-23T10:12:19.087,Services:null,ServiceProviderTypes:null}]";
}

Answer 1

“unknown_object”的值是一个字符串，但您在调用 objectForKey: 时假设它是一个字典。因此异常(exception)。

总的来说，我会说 JSON 是“坏的”，因为它需要双重反序列化，这没什么用。