如何在NSObject中检索JSON中从web中检索的类型字符串的值？

Question

我有一个NSObject boastObj，它包含string类型的购买属性。我正在通过JSON parse检索值，这是要结果的子对象。

@interface BoasterElite : NSObject    
{
    NSString* purchase;
}

下面是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，请使用

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



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

可能对你有帮助。

Answer 2

results是一个字典数组，假设json是JSON对象

NSArray *results = json["results"];

可以通过以下方法获得points值

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

purchase在数组的第一项中，它也是一个字典数组。

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

现在您可以按键获取值，例如

NSString *brand = purchase["brand"];