how to access all index set from JSON data using NSDictionary - ios

Question

I am trying to get my user name and password, which I am getting from my server. I already store in jsondata which is NSMutableArray. However I am getting only one data via -objectAtIndex:. I want to call my all data inside the dictionary. I know I have to use NSIndexSet but I don't know the proper way to use it. I'm using a for loop. I'm not able to access my value for key to match user credentials. Can anybody suggest anything? Here's my code:
NSDictionary *dict = [jsondata objectAtIndex:0];
if ([username.text isEqualToString:[dict valueForKey:#"username"]]&&[password.text isEqualToString:[dict valueForKey:#"password"]]) {
username.text=nil;
password.text=nil;
[self performSegueWithIdentifier:#"login" sender:nil];
}
else {
UIAlertView *error=[[UIAlertView alloc]initWithTitle:#"Oooops" message:#"Login Credentials did`t Match" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil];
[error show];
}

Answer 1

NSString *tusername = nil;
NSString *tpassword = nil;
BOOL isLogin = NO;
//jsondata contains many dictionary, so iterate the loop and find the dictionary that
//contains username and password
for(id temp in jsondata)
{
//check whether the object is Dictionary or not
if([temp isKindOfClass:[NSDictionary class]])
{
NSDictionary *dict = temp;
if([[dict allKeys] containsObject:#"username"])
{
tusername = [dict valueForKey:#"username"];
}
else if([[dict allKeys] containsObject:#"password"])
{
tpassword = [dict valueForKey:#"password"];
}
//Check the condition here
if(tusername != nil && tpassword != nil)
{
if ([username.text isEqualToString:tusername] && [password.text isEqualToString:tpassword])
{
isLogin = YES;
username.text=nil;
password.text=nil;
[self performSegueWithIdentifier:#"login" sender:nil];
break;
}
}
}
}
if(!isLogin)
{
UIAlertView *error=[[UIAlertView alloc]initWithTitle:#"Oooops" message:#"Login Credentials did`t Match" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil];
[error show];
}

Answer 2

You need to call a loop to access all the data on jsondata. Call as follows:
for (int i=0; i<[jsondata count]; i++)
{
NSDictionary *dict = [jsondata objectAtIndex:i];
if ([username.text isEqualToString:[NSString stringWithFormat: #"%#",[dict valueForKey:#"username"]]]&&[password.text isEqualToString:[NSString stringWithFormat: #"%#",[dict valueForKey:#"password"]]]) {
username.text=nil;
password.text=nil;
[self performSegueWithIdentifier:#"login" sender:nil];
}
else {
UIAlertView *error=[[UIAlertView alloc]initWithTitle:#"Alert Title" message:#"Your alert messege" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil];
[error show];
}
}