ios - @"{\"详细信息\":\"好友请求已待处理。\"}"如何从此 json 字符串中检索值

Question

@"{\"details\":\"A friend request is already pending.\"}".. 这是来自服务器的json字符串。我想在一个字符串中检索对象，即 friend 请求已经挂起，字符串将在一个字符串中。请告诉我如何取回它。

我试过这样

NSString *str = @"{\"details\": \"A friend request is already pending.\"}";

NSLog(@"%@",str);

NSString *resultStr1 = [str stringByReplacingOccurrencesOfString:@"{" withString:@""];
NSString *resultStr2 = [resultStr1 stringByReplacingOccurrencesOfString:@"}" withString:@""];


//NSLog(@"%@",resultStr2);


//NSString *encodestr = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//NSLog(@"%@",encodestr);

NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

data = [data subdataWithRange:NSMakeRange(0, [data length] - 1)];

NSLog(@"%@",data);

NSError *error =Nil;

NSArray *JSON = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"%@",JSON);

NSLog(@"%@",[JSON valueForKey:@"details"]);

Answer 1

试试这个。将字符串转换为字典并通过键访问它。当您遇到大量数据时，这将很有帮助。

NSString *str = @"{\"details\": \"A friend request is already pending.\"}";

    NSData *data    =   [str dataUsingEncoding:NSUTF8StringEncoding];

    NSError* error;

    NSDictionary* dic   =   [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];

    NSLog(@"%@", [dic objectForKey:@"details"]);