在IOS中解析嵌套的JSON代碼

Question

我正在嘗試在iOS中解析以下JSON代碼。 JSON代碼由一系列從0到x的游戲組成。 我一直在搜索，但似乎找不到任何具有這種格式的JSON的示例。

{
"command":"show_my_games",
"0":{"gameid":"7","foruserid":"16","againstuserid":"0","casefor":"","caseagainst":"","status":"0","argumentid":"7","againstusername":null,"forusername":"Gem","argument":"argument 1"},
"1":{"gameid":"8","foruserid":"15","againstuserid":"16","casefor":"","caseagainst":"","status":"0","argumentid":"23","againstusername":"Gem","forusername":"Nick","argument":"argument 2"},
"2":{"gameid":"9","foruserid":"18","againstuserid":"16","casefor":"","caseagainst":"","status":"0","argumentid":"26","againstusername":"Gem","forusername":"Nick","argument":"argument 3"}
}

我已經創建了一個游戲對象，並且想要為JSON數組中的每個項目創建一個新的游戲對象，並將其添加到游戲數組中。 我在解析JSON時遇到問題，非常感謝您的幫助或建議。

我正在嘗試使用的代碼是

            NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&err];

            for (NSMutableDictionary * gameItem in json) {
                Game *obj = [Game new];
                obj.GameID=[gameItem objectForKey:@"gameid"];
                obj.Argument=[gameItem objectForKey:@"argument"];
                obj.CaseFor=[gameItem objectForKey:@"casefor"];
                obj.CaseAgainst=[gameItem objectForKey:@"caseagainst"];
                obj.CaseForOwner=[gameItem objectForKey:@"forusername"];
                obj.CaseAgainstOwner=[gameItem objectForKey:@"againstusername"];
                obj.CaseForOwnerID=[gameItem objectForKey:@"foruserid"];
                obj.CaseAgainstOwnerID=[gameItem objectForKey:@"againstuserid"];
                //add to the players game array
                [myGameArray addObject:obj];

            }
            NSLog(@"array: %@", myGameArray);

當我嘗試從JSON數組提取數據時，收到以下錯誤。 -[__ NSCFString objectForKey：]：無法識別的選擇器已發送到實例0x1f06f4e0

提前致謝，

缺口

Answer 1

由於鍵盤command的對象不是字典，因此代碼已中斷。

您可以像這樣修改代碼。

    for (NSString *key in json){
        id object = json[key];
        if ([object isKindOfClass:[NSDictionary class]]) {
           Game *obj = [Game new];
           obj.GameID=[gameItem objectForKey:@"gameid"];
           obj.Argument=[gameItem objectForKey:@"argument"];
           obj.CaseFor=[gameItem objectForKey:@"casefor"];
           obj.CaseAgainst=[gameItem objectForKey:@"caseagainst"];
           obj.CaseForOwner=[gameItem objectForKey:@"forusername"];
           obj.CaseAgainstOwner=[gameItem objectForKey:@"againstusername"];
           obj.CaseForOwnerID=[gameItem objectForKey:@"foruserid"];
           obj.CaseAgainstOwnerID=[gameItem objectForKey:@"againstuserid"];
           //add to the players game array
          [myGameArray addObject:obj];
    }

我建議在Game類中創建一個initWithDictionary:(NSDictionary *)dictionary以獲取更簡潔的代碼。

Answer 2

您需要將類型gameItem“ NSMutableDictionary ”更改為“ id ”並添加檢查if ([gameItem isKindOfClass: [NSDictionary Class]]) ，在這種情況下，請初始化“ obj ”