IOS中的简单嵌套JSON解析

Question

我从API接收此JSON：

{"MatchedResult":{"CurrentStatus":47}}

使用此代码：

NSString *responseString = [request responseString];
NSDictionary *responseDict = [responseString JSONValue];
NSString *currentStatus = [responseDict objectForKey:@"CurrentStatus"];

返回Null。

使用此代码：

NSString *responseString = [request responseString];
NSDictionary *responseDict = [responseString JSONValue];
NSString *currentStatus = [responseDict objectForKey:@"MatchedResult"];

返回：

{
    CurrentStatus = 47;
}

我如何才能获得47的状态？

Answer 1

你需要深入了解结构：

NSString *responseString = [request responseString];
NSDictionary *responseDict = [responseString JSONValue];
NSString *currentStatus = responseDict[@"MatchedResult"][@"CurrentStatus"];

Answer 2

您的Response字典包含Matched Result字典，其中包含您的CurrentStatus。

你想......

NSDictionary *matchedResultDict = [responseDict objectForKey:@"MatchedResult"];
NSString *currentStatus = [matchedResultDict objectForKey:@"CurrentStatus"];

Answer 3

获取您需要的值，您必须分析json以获得必要的密钥

{
     "MatchedResult": {
        "CurrentStatus": 47
      }
}

因为需要CurrentStatus键必须通过MatchedResult

NSString *responseString = [request responseString]; 
NSDictionary *responseDict = [responseString JSONValue];
NSString *currentStatus = [[responseDict objectForKey:@"MatchedResult"] objectForKey:@"CurrentStatus"];