如何在 NSObject 中检索字符串类型的值，该值是从 JSON 中的 web 检索的

Question

我有一个NSObject boastObj，它包含字符串类型的购买属性。我正在通过JSON parse检索值，该值是结果的子对象。

@interface BoasterElite : NSObject    
{
    NSString* purchase;
}

以下是 JSON。

"results": [
    {
        "name": "UserName",
        "points": "2",
        "profile_photo": "https://scontent.fblr1-1.fna.fbcdn.net/hphotos-xtf1/v/t1.0-9/12004045_134589590222520_1895675040105383396_n.jpg?oh=17c11a393c141443bdd3bc1451a560a8",
        "purchase": [
            {
                "purchase_id": "1",
                "purchase_type": "car",
                "timeDate": "2016-04-01 00:10:49",
                "brand": "Ferrari",
                "model": "v3",
                "year": "2016",
                "photo": "https://cdn1.vox-cdn.com/thumbor/-pG8Dcb_qtRf6te3ug12FHhqUDs=/1020x0/cdn0.vox-cdn.com/uploads/chorus_asset/file/4156848/Ferrari_F12tdf_3low.0.jpg",
                "message": "ferrari car in boaster app",
                "verify_id": "0"
            }
        ]
    }
],

Answer 1

将 json 值存储在 NSDictionary 或 NSArray 中。

如果要检索 NSString 值，则意味着使用

NSString *name = [[json objectForKey:@"results"] objectForKey:@"name"];

NSString *purchase_type = [[[json objectForKey:@"results"] objectForKey:@"purchase"] objectForKey:@"purchase_type"];

它可能会对你有所帮助。

Answer 2

results是一个字典数组，假设json是JSON对象

NSArray *results = json["results"];

您可以使用以下命令获取points值

NSString *points = results[0]["points"];

purchase 位于数组的第一项中，它也是一个字典数组。

NSArray *purchases = results[0]["purchase"];
NSDictionary *purchase = purchases[0];

现在您可以通过键获取值，例如

NSString *brand = purchase["brand"];