textFieldShouldReturn ignoring variables - ios

Question

I have this code on my textFieldShouldReturn (is not in the same class as the method called):
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
LoginViewController *loginViewController = [[LoginViewController alloc]init];
if (textField.returnKeyType == UIReturnKeyJoin) [loginViewController logIn];
return (textField.returnKeyType == UIReturnKeyDone);
}
Everything works perfect until this point, this is the code of the "login" method:
- (IBAction)logIn{
NSString *username = [[self.usernameLoginField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] lowercaseString];
NSString *password = [[self.passwordLoginField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] lowercaseString];
NSLog(#"Username: %# - Password: %# ",username,password);
//Whatever
}
On my view, I have a button that calls that method, when I use that button the NSLog shows what the UITextField contains in that moment, otherwise, If the method is called from the "Join" (Return key) from de keyboard, the NSLog shows null content on the variables.
What am I missing?.

Answer 1

In my opinion you have 3 possible solutions:
Option 1: The best option IMHO.
You can use UIAlertView with UIAlertViewStyle = UIAlertViewStyleLoginAndPasswordInput
self.alertView = [[UIAlertView alloc] initWithTitle:nil
message:#"LogIn"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:#"Cancel", #"Join", nil];
self.alertView.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;
[self.alertView show];
Then with the delegate:
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (alertView == self.alertView)
{
if (buttonIndex == 1)
{
[self logIn:[[alertView textFieldAtIndex:0] text] andPassword:[[alertView textFieldAtIndex:1] text]];
}
else if (buttonIndex == 0)
{
[self.navigationController popViewControllerAnimated:YES];
}
}
}
Remember to add: UIAlertViewDelegate
Option 2:
Working with [self performSegueWithIdentifier:#"identifier" sender:self] and
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
#pragma mark - UITextFieldDelegate
- (BOOL) textFieldShouldReturn:(UITextField *)textField
{
if (textField == self.usernameLoginField)
{
[self.usernameLoginField resignFirstResponder];
[self.passwordLoginField becomeFirstResponder];
}
else if (textField == self.passwordLoginField)
{
[self.passwordLoginField resignFirstResponder];
//This Identifier is in the Storyboard
[self performSegueWithIdentifier:#"option2Segue" sender:self];
}
return true;
}
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
[(YourViewController *)segue.destinationViewController setUsername:self.usernameLoginField.text];
[(YourViewController *)segue.destinationViewController setPassword:self.passwordLoginField.text];
}
In YourViewController.h you need:
#property (nonatomic, strong) NSString* username;
#property (nonatomic, strong) NSString* password;
Remember to add: UITextFieldDelegate
Option 3
To send back information, you should use Delegation:
In Your firstViewController.h:
#import "DelegateViewController.h"
#interface FirstViewController : UIViewController
(void) logIn: (NSString *) username password: (NSString *) password;
In Your firstViewController.m:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"option3Delegate"])
{
((DelegateViewController *) segue.destinationViewController).delegate = self;
}
}
In Your delegateViewController.h:
#protocol Option3Delegate <NSObject>
- (void) logIn: (NSString *) username password: (NSString *) password;
#end
#interface DelegateViewController : UIViewController
{
id myDelegate;
}
#property (nonatomic, assign) id<Option3Delegate> delegate;
#end
In Your delegateViewController.m:
#pragma mark - UITextFieldDelegate
- (BOOL) textFieldShouldReturn:(UITextField *)textField
{
if (textField == self.usernameLoginField)
{
[self.usernameLoginField resignFirstResponder];
[self.passwordLoginField becomeFirstResponder];
}
else if (textField == self.passwordLoginField)
{
[self.passwordLoginField resignFirstResponder];
//This Identifier is in the Storyboard
if ([_delegate respondsToSelector:#selector(logIn:password:)])
{
[_delegate logIn:self.usernameLoginField.text password:self.passwordLoginField.text];
}
[self.navigationController popViewControllerAnimated:YES];
}
return true;
}
Remember to add: UITextFieldDelegate
Option 4: With KeyboardController
KeyboardController is a small solution to handle the Keyboard interaction inside UITextFields. However only handle with Next and Done Return keys. To handle the Join key you can do it in your ViewController. In the view controller where you allocate KeyboardController:
#property (strong, nonatomic) IBOutlet UITextField *usernameLoginField;
#property (strong, nonatomic) IBOutlet UITextField *passwordLoginField;
#property (strong, nonatomic) KeyboardController *keyboardController;
- (void)viewDidLoad
{
[super viewDidLoad];
id fields = #[self.usernameLoginField, self.passwordLoginField];
self.keyboardController = [KeyboardController controllerWithFields:fields];
//Important
self.passwordLoginField.delegate = self;
}
#pragma mark - UITextFieldDelegate
- (BOOL) textFieldShouldReturn:(UITextField *)textField
{
if (textField == self.passwordLoginField)
{
[self.passwordLoginField resignFirstResponder];
[self logIn];
}
return true;
}
- (IBAction)logIn
{
NSLog(#"Username: %# - Password: %#", self.usernameLoginField.text, self.passwordLoginField.text);
//Whatever
}
You can download an example with the 4 options here: