capture a variable content and pass it to a second view controller - objective-c

Question

I have read so much on the subject of passing variable between ViewController in Xcode I am totally lost.
1:I have a members database on my server which is populated with members details
2: In xcode a have a "ViewController.h and .m" which run code allowing users to authenticate with the members data table on my sever. This works perfectly well, no issues.
What I want to do is capture the "login" and "password" into two variables and use the variables in a second "ViewController".
First ViewController.h:
#interface FirstViewController : UIViewController {
UITextField *txtUsername;
UITextField *txtPassword;
}
#property (nonatomic, retain) IBOutlet UITextField *txtUsername;
#property (nonatomic, retain) IBOutlet UITextField *txtPassword;
- (IBAction)loginClicked:(id)sender;
- (IBAction)backgroundClick:(id)sender;
First ViewController.m
#import "FirstViewController.h"
#import "WebViewController.h"
#import "SBJson.h"
#implementation FirstViewController
#synthesize txtPassword, txtUsername;
- (IBAction)loginClicked:(id)sender {
#try {
if([[txtUsername text] isEqualToString:#""] || [[txtPassword text] isEqualToString:#""] ) {
[self alertStatus:#"Please enter both Username and Password" :#"Login Failed!"];
} else {
NSString *post =[[NSString alloc] initWithFormat:#"login=%#&pass=%#",[txtUsername text],[txtPassword text]];
NSLog(#"PostData: %#",post);
NSURL *url=[NSURL URLWithString:#"http://www.mydomain.com/check1.php"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
//[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]];
NSError *error = [[NSError alloc] init];
NSHTTPURLResponse *response = nil;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSLog(#"Response code: %d", [response statusCode]);
if ([response statusCode] >=200 && [response statusCode] <300)
{
NSString *responseData = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
NSLog(#"Response ==> %#", responseData);
SBJsonParser *jsonParser = [SBJsonParser new];
NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:responseData error:nil];
NSLog(#"%#",jsonData);
NSInteger success = [(NSNumber *) [jsonData objectForKey:#"success"] integerValue];
NSLog(#"%d",success);
if(success == 1)
{
//NSLog(#"Login SUCCESS");
//[self alertStatus:#"Logged in Successfully." :#"Login Success!"];
WebViewController *second = [[WebViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:second animated:YES];
} else {
NSString *error_msg = (NSString *) [jsonData objectForKey:#"error_message"];
[self alertStatus:error_msg :#"Login Failed!"];
}
} else {
if (error) NSLog(#"Error: %#", error);
[self alertStatus:#"Connection Failed" :#"Login Failed!"];
}
}
}
#catch (NSException * e) {
NSLog(#"Exception: %#", e);
[self alertStatus:#"Login Failed." :#"Login Failed!"];
}
}
Second ViewController.h
#interface LettoWebViewController : UIViewController {
IBOutlet UIWebView *lettoWebView;
NSString *AmemberUsername;
NSString *AmemberPassword;
}
#property (retain) NSString *AmemberUsername;
#property (retain) NSString *AmemberPassword;
Second ViewController.m
#import "WebViewController.h"
#import "SBJson.h"
#interface WebViewController ()
#end
#implementation WebViewController
#synthesize AmemberPassword, AmemberUsername;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSString *post =[[NSString alloc] initWithFormat:#"login=%#&pass=%#",[AmemberUsername text],[AmemberPassword text]];
NSLog(#"PostData: %#",post);
NSURL *myURL=[NSURL URLWithString:#"http://www.mydomain.com/apps/index.php"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:myURL];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
[lettoWebView loadRequest:request];
}
My questions is; how can I can I pass the two variables in the most simple way.
Any help would be great but please be kind I am very new to xcode and coding in general.
Regards
DJ

Answer 1

The solution:
When you created WebViewController, you just had to set the two parameters.
WebViewController *second = [[WebViewController alloc] initWithNibName:nil bundle:nil];
[second setAmemberUsername:[txtUsername text]];
[second setAmemberPassword:[txtPassword text]];
[self presentModalViewController:second animated:YES];
In your viewDidLoad of the WebViewController:
There was an issue, you wrote:
NSString *post =[[NSString alloc] initWithFormat:#"login=%#&pass=%#",[AmemberUsername text],[AmemberPassword text]];
But, AmemberPassword and AmemberUserName are NSString. So they don't know the text method. They aren's UITextField.
So the correction is:
NSString *post =[[NSString alloc] initWithFormat:#"login=%#&pass=%#",AmemberUsername,AmemberPassword];