Question

我有a small iPhone app，它从社交网络中获取用户信息（名称，城市，性别），然后在视图中显示：

app screenshot

数据以JSON格式到达（请注意男性用户sex = 0）：

2014-01-22 21:18:42.915 oauthMailru[697:1303] json=(
        {
        age = 41;
        "app_installed" = 1;
        birthday = "08.06.1972";
        "first_name" = Alexander;
        "friends_count" = 17;
        "has_pic" = 1;
        "is_friend" = 0;
        "is_online" = 0;
        "is_verified" = 1;
        "last_name" = Farber;
        "last_visit" = 1390312557;
        link = "http://my.mail.ru/mail/farber72/";
        location =         {
            city =             {
                id = 855;
                name = "Dusseldorf";
            };
            country =             {
                id = 46;
                name = "Germany";
            };
        };
        nick = "Alexander Farber";
        pic = "http://avt.appsmail.ru/mail/farber72/_avatar";
        "pic_big" = "http://avt.appsmail.ru/mail/farber72/_avatarbig";
        "pic_small" = "http://avt.appsmail.ru/mail/farber72/_avatarsmall";
        "referer_id" = "";
        "referer_type" = "";
        sex = 0;
        "show_age" = 1;
        uid = 17880121030128875114;
        vip = 0;
    }
)

然后我将其打印在我的DetailViewController.m：

中

2014-01-22 21:18:42.920 oauthMailru[697:70b] id: 17880121030128875114
2014-01-22 21:18:42.920 oauthMailru[697:70b] first_name: Alexander
2014-01-22 21:18:42.921 oauthMailru[697:70b] last_name: Farber
2014-01-22 21:18:42.921 oauthMailru[697:70b] city: Dusseldorf
2014-01-22 21:18:42.921 oauthMailru[697:70b] female: 1
2014-01-22 21:18:42.922 oauthMailru[697:70b] avatar: http://avt.appsmail.ru/mail/farber72/_avatarbig

解析JSON输入的代码位于ViewController.m，并将其分配给User.h属性：

         NSDictionary *dict = json[0];

         _user = [[User alloc] init];
         _user.userId    = dict[@"uid"];
         _user.firstName = dict[@"first_name"];
         _user.lastName  = dict[@"last_name"];
         _user.city      = dict[@"location"][@"city"][@"name"];
         _user.avatar    = dict[@"pic_big"];
         _user.female    = !(BOOL)dict[@"sex"];

出于某种原因，最后一个用户属性 - BOOL female对我来说总是设置错误。

我尝试过以下操作但没有成功：

         _user.female    = !(BOOL)dict[@"sex"];
         _user.female    = (0 != dict[@"sex"]);
         _user.female    = (int)dict[@"sex"];

有人可以告知，如何正确地将id投放到BOOL？

Answer 1

您无法在Objective C中将对象强制转换为基元（id s是对象指针）。假设您的JSON解析器将数字解析为NSNumbers，您只需要这样做：

![dict[@"sex"] boolValue]

Answer 2

dict[@"sex"]不是BOOL，而是NSNumber，所以你想要：

![dict[@"sex"] boolValue]

Answer 3

你应该试试

_user.female = ([dict[@"sex"] intValue]>0)

转换＆＃34;性别= 0＆＃34;在JSON中一个BOOL

3 个答案: