如何使用目标c在iOS中解析jsonstring？

Question

I have the following json,

{   
    "method":"login", 
    "data":{  
        "username":"abc", 
        "password":"123" 
    } 
} 

I'm using following code to parse it,

NSString* loginMethod= json[@"method"];
NSString* credentials= json[@"data"];
NSLog(@"credentials %@",credentials);

I'm able to get the value for the key data but I'm not be able to get the value of username and password. How to get those values?

Answer 1

change

NSString* credentials= json[@"data"];

to

NSDictionary* credentials= json[@"data"];

then

NSString *username = credentials[@"username"];

Answer 2

if json is in respose data then

NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:request.responseData options:kNilOptions error:&err];

if json is in string then

NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:[str dataUsingEncoding:NSUTF8StringEncoding]; options:kNilOptions error:&err];


NSString* loginMethod= [jsonDic objectForKey:@"method"];

NSString* usename= [[jsonDic objectForKey:@"data"]objectForKey:@"username"];
NSString* password= [[jsonDic objectForKey:@"data"]objectForKey:@"password"];

Answer 3

您可以通过credentials[@"username"]和credentials[@"password"]获得这些值。

Answer 4

do like

reason it deverives like nested Dictionry

NSString* loginMethod= json[@"method"]; // this is correct

NSString* username= json[@"data"][@"username"];
NSString* password= json[@"data"][@"password"];

Choice -2

 NSString* loginMethod= json[@"method"]; 

// This isNested Dictionary so Do like
NSDictionary* temp= json[@"data"];
NSString *username = temp[@"username"];
NSString * password = temp[@"password"];