如何将这样的JSON解析为NSDictionary并获取键和值

Question

[
 {
"week": "1-16",
"course": "math",
"lecturer:": "AAA",
"credit": "2"   },
{
"week": "9-16",
"course": "tech",
"lecturer:": "BBB",
"credit": "2"   },
{
"week": "1-8",
"course": "English",
"lecturer:": "CC",
"credit": "0.5"   },
{
"week": "1-16",
"course": "German",
"lecturer:": "DDD",
"credit": "4"   }
]

我有这样的JSON，并使用以下代码将其解析为NSDictionary

NSDictionary *resultDic = [NSJSerialization JSONObjectWithData:resData         options:NSJSONReadingAllowFragments error:nil];

但是，当我尝试从NSDictionary的键获取值时，发生错误，我发现NSDictionary中没有键。

那么如何使用ObjectForKey获取值呢？

Answer 1

resultDic将是字典的数组，而不是字典本身。 您想要这样的东西：

NSArray * resultArray = [NSJSONerialization JSONObjectWithData:resData   options:NSJSONReadingAllowFragments error:nil];
NSDictionary * result = [resultArray objectAtIndex:0];
NSString * week = [result objectForKey:@"week"];