Ios 如何在json中检索键的特定值？

这是我的json内容

 [  
  {  
    "sha":"30eae8a47d0203ac81699d8fc2ab2632de2d0bba",
     "commit":{  
     "author":{  
        "name":"Madhura Bhave",
        "email":"mbhave@pivotal.io",
        "date":"2017-03-23T23:14:32Z"
     },
     "committer":{  
        "name":"Madhura Bhave",
        "email":"mbhave@pivotal.io",
        "date":"2017-03-23T23:14:32Z"
     },
     "message":"Merge branch '1.5.x'",

   }
 }
 ]

这是我的主要任务。我只想从邮件中检索键值，从提交者字典中检索姓名、电子邮件、日期。我被困在了如何做到这一点上

    NSMutableArray *CommitArray = [[NSMutableArray alloc] init];


    for (NSDictionary *CommitDictionary in CommitJson) {
        CommitDict *commitDictObj = [[CommitDict alloc] init];
        commitDictObj.message = [CommitDictionary objectForKey:@"message"];

        for (NSDictionary *CommitterDictionary in [CommitDictionary objectForKey:@"committer"]) {
            Committer *author = [[Committer alloc] init];
            author.name = [CommitterDictionary objectForKey:@"name"];
            author.email = [CommitterDictionary objectForKey:@"email"];
            author.date = [CommitterDictionary objectForKey:@"date"];
        }

        [CommitArray addObject:commitDictObj];
    }




    for (int i =0 ; i < [CommitArray count] ; i++){
        CommitDict *commitDictObj = [CommitArray objectAtIndex:i];
        NSLog(@"Commit Message: %@", commitDictObj.message);



    }

     return 0;
}

}

NSMutableArray*CommitArray=[[NSMutableArray alloc]init]；
for（CommitJson中的NSDictionary*CommitDictionary）{
CommitDict*commitDictObj=[[CommitDict alloc]init]；
committedcotbj.message=[committedictionary objectForKey:@“message”]；
对于（在[CommitDictionary objectForKey:@“committer”]中的NSDictionary*CommitterDictionary）{
提交人*author=[[Committer alloc]init]；
author.name=[CommitterDictionary objectForKey:@“name”]；
author.email=[CommitterDictionary objectForKey:@“email”]；
author.date=[CommitterDictionary objectForKey:@“date”]；
}
[CommitArray addObject:commitDictObj]；
}
对于（int i=0；i<[CommitArray count]；i++）{
CommitDisct*CommitDisctobj=[CommitArray对象索引：i]；
NSLog（@“提交消息：%@”，committedcotbj.Message）；
}
返回0；
}
}

---

我尝试获取json并显示它的message、name、email和date值。我如何记录message、name、email和date的值？

您的数组包含一个字典，而该字典包含

commit

字典，而不是直接包含

commit

字典。替换代码的该部分：

for (NSDictionary *CommitDictionary in CommitJson) {
        CommitDict *commitDictObj = [[CommitDict alloc] init];

因此：

for (NSDictionary *shaCommitDictionary in CommitJson) {
        CommitDict *commitDictObj = [[CommitDict alloc] init];
        NSDictionary *CommitDictionary = [shaCommitDictionary objectForKey:@"commit"];

（1） 将JSON转换为NSDictionary

NSData *jsonData= ... // Assume you got the data already loaded
NSError *error = nil;    
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

（2） 访问字典值（快速枚举现在可用

NSString *message = dictionary[@"message"];

NSDictionary *author = dictionary[@"author"];
NSString *name = author[@"author"];
NSString *email = author[@"author"];
NSString *date = author[@"author"];
// OR:
// NSString *name = dictionary[@"author"][@"author"];
// NSString *email = dictionary[@"author"][@"author"];
// NSString *date = dictionary[@"author"][@"author"];

就这样。我认为棘手的事情是把JSON数据放到NSDictionary中？

---

请参见此处：

打印提交数组一次，打印提交JSON一次，先生..我不明白..您能解释更多细节吗？您需要澄清您的问题。请回答您的问题并提供更多细节。您发布的代码究竟以什么方式不起作用？它编译了吗？它崩溃了吗？它能走多远？打印一次此数据id提交JSON sample包含不平衡的[]和{}；您的代码使用的键“commits_url”在您显示的JSON中没有出现；并且您不清楚您的代码哪里出错了。如果人们想帮助您而不进行大量猜测，您需要澄清您的问题并提供更多细节。