我将以下数据保存为NSString
:
{
Key = ID;
Value = {
Content = 268;
Type = Text;
};
},
{
Key = ContractTemplateId;
Value = {
Content = 65;
Type = Text;
};
},
我想将此数据转换为包含键值对的NSDictionary
。
我首先尝试将NSString
转换为 JSON 对象,如下所示:
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
但是当我尝试时:
NSString * test = [json objectForKey:@"ID"];
NSLog(@"TEST IS %@", test);
我收到值为 NULL
.
谁能建议问题出在哪里?
我相信您误解了键值的 JSON 格式。您应该将字符串存储为
NSString *jsonString = @"{"ID":{"Content":268,"type":"text"},"ContractTemplateID":{"Content":65,"type":"text"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
现在,如果您执行以下NSLog语句
NSLog(@"%@",[json objectForKey:@"ID"]);
结果将是另一个 NSDictionary。
{
Content = 268;
type = text;
}
我认为您从响应中获取数组,因此您必须将响应分配给数组。
NSError *err = nil;NSArray *array = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&err];NSDictionary *dictionary = [array objectAtIndex:0];
NSString *test = [dictionary objectForKey:@"ID"];
NSLog(@"Test is %@",test);
使用以下代码,其中 str 是您的 JSON 字符串:
NSError *err = nil;
NSArray *arr =
[NSJSONSerialization JSONObjectWithData:[str dataUsingEncoding:NSUTF8StringEncoding]
options:NSJSONReadingMutableContainers
error:&err];
// access the dictionaries
NSMutableDictionary *dict = arr[0];
for (NSMutableDictionary *dictionary in arr) {
// do something using dictionary
}
Swift 3:
if let jsonString = styleDictionary as? String {
let objectData = jsonString.data(using: String.Encoding.utf8)
do {
let json = try JSONSerialization.jsonObject(with: objectData!, options: JSONSerialization.ReadingOptions.mutableContainers)
print(String(describing: json))
} catch {
// Handle error
print(error)
}
}
使用以下代码从AFHTTPSessionManager
失败块获取响应对象;然后可以将泛型类型转换为所需的数据类型:
id responseObject = [NSJSONSerialization JSONObjectWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] options:0 error:nil];