xCode and JSON Connection in iOS 6.0

I Tried with ASIHttpRequest but found that it will not work in iOS 6.0 because ARC is not supported in ASIHttpRequest. And googled a lot for the POST method connection to PHP. So finally i found the NSMutableURLRequest method for safe and reliable. So here is the method to call a simple Login Feature.

1. First Declare NSMutableData as follow

@interface LoginViewController ()

@property (nonatomic, strong) NSMutableData *responseData;

@end

2. Now initiate this Data in viewDidLoad as follow

self.responseData = [NSMutableData data];

3. Send you User id and password to JSON by following method

-(void)connectForCredential:(NSString *)userId andPassword:(NSString *)userPassword

{

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.urlname.com/login"]];

    NSString *postString = [NSString stringWithFormat:@"username=%@&password=%@",userId, userPassword];

    [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPMethod:@"POST"];

    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    NSURLConnection *connection= [[NSURLConnection alloc] initWithRequest:request

                                                                 delegate:self];

    if (connection) {

    }

    else {}

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    [self.responseData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [self.responseData appendData:data];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    printf("Data Failure");

}

// Following function will show you the result mainly

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    printf("connectionDidFinishLoading");

    printf("\nSucceeded! Received %d bytes of data\n",[self.responseData length]);

    

    // convert to JSON

    NSError *myError = nil;

    NSDictionary *res = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:&myError];

    

    // show all values

    for(id key in res) {

        

        id value = [res objectForKey:key];

        

        NSString *keyAsString = (NSString *)key;

        NSString *valueAsString = (NSString *)value;

        

        NSLog(@"\nkey: %@", keyAsString);

        NSLog(@"value: %@", valueAsString);

    }

    

    // extract specific value...

    NSArray *results = [res objectForKey:@"results"];

    

    for (NSDictionary *result in results) {

        NSString *icon = [result objectForKey:@"icon"];

        printf("icon: %@", icon);

    }

    

}