如何將這樣的JSON解析為NSDictionary並獲取鍵和值

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"   }
]

我有這樣的JSON，並使用以下代碼將其解析為NSDictionary

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

但是，當我嘗試從NSDictionary的鍵獲取值時，發生錯誤，我發現NSDictionary中沒有鍵。

那么如何使用ObjectForKey獲取值呢？

Answer 1

resultDic將是字典的數組，而不是字典本身。 您想要這樣的東西：

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