In the method -(void)registerUser I present a modal view with 2 UITextFields and a Ok Button.
After filling the UITextFields and pressing the Ok Button I call the delegate method -(void)AEMUserRegistrationVCUserName:(NSString *)un password:(NSString *)pw where I verify the data connecting to a server.
When the answer arrives in -(void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response If the data is wrong I try to set focus on the UITextfield with self.userRegistrationVC.userName becomeFirstResponder]but it does not get the focus.
I have checked [self.userRegistrationVC.userName canBecomeFirstResponder] and it returns NO, which on the other hand is what the docs say it is returned by default.
My code is here as a reference:
Note:
self.userNameand selfPasswordare NSStrings.
self.userRegistrationVCis a UIViewController.
self.userRegistrationVC.userNameand self.userRegistrationVC.passwordare UITextfields.
-(void)registerUser
{
//Recuperar el nombre de usuario
self.userName = [[NSUserDefaults standardUserDefaults] objectForKey:kNombreUsuario];
if (!self.userName) {
//No hay nombre de usuario, el usuario nunca ha registrado la aplicación.
if (!self.userRegistrationVC) {
//Solicitar datos de registro
self.userRegistrationVC = [[AEMUserRegistrationViewController alloc] initWithNibName:@"AEMUserRegistrationViewController" bundle:nil];
}
self.userRegistrationVC.delegate = self;
[self.viewControllerToPresentModalView presentModalViewController:self.userRegistrationVC animated:YES];
return;
}
//Recuperar la contraseña
NSError *error;
self.password = [SFHFKeychainUtils getPasswordForUsername:self.userName andServiceName:kServiceName error:&error];
if (!self.password) {
//No hay contraseña. La contraseña se ha perdido.
if (!self.userRegistrationVC) {
//Solicitar datos de registro
self.userRegistrationVC = [[AEMUserRegistrationViewController alloc] initWithNibName:@"AEMUserRegistrationViewController" bundle:nil];
}
self.userRegistrationVC.delegate = self;
[self.viewControllerToPresentModalView presentModalViewController:self.userRegistrationVC animated:YES];
return;
}
//Los datos del usuario existen
//Verificar el registro
[self.client get:kConfirmUsuario
queryParams:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:self.userName, self.password, nil]
forKeys:[NSArray arrayWithObjects:kNombreUsuario, kPassword, nil]]
delegate:self];
}
-(void)AEMUserRegistrationVCUserName:(NSString *)un password:(NSString *)pw
{
//El usuario ha introducido datos de registro
//Realizar el registro
self.userName = un;
self.password = pw;
[self.client get:kCreateUsuario
queryParams:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:self.userName, self.password, nil]
forKeys:[NSArray arrayWithObjects:kNombreUsuario, kPassword, nil]]
delegate:self];
//No hacer dismiss ahora esperar a verificar el registro
}
-(void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response
{
//Puede responder a createUsuario o a confirmUsuario
//En ambos casos el error impide registrar al usuario y ejecutar el programa
BOOL isRequestCreateUser;
NSRange aRange = [request.resourcePath rangeOfString:kCreateUsuario];
if (aRange.location != NSNotFound) {
//The request was to create a user
isRequestCreateUser = YES;
} else {
//The request was to check a user
isRequestCreateUser = NO;
}
if (response.isConflict) {
//Error
[self.userRegistrationVC.userNameError setHidden:NO];
if ([self.userRegistrationVC.password canResignFirstResponder]) {
NSLog(@"SI"); //This return NO
}
if ([self.userRegistrationVC canBecomeFirstResponder]) {
NSLog(@"SI"); //This returns NO
}
[self.userRegistrationVC.userName becomeFirstResponder];
}
if (response.isServerError) {
//Error
[self.userRegistrationVC.userNameError setHidden:NO];
[self.userRegistrationVC.userName becomeFirstResponder];
}
if (response.isOK) {
//Success
//Retirar la pantalla de registro de usuario
[self.viewControllerToPresentModalView dismissModalViewControllerAnimated:YES];
//Si la peticion fue crear un usuario
if (isRequestCreateUser) {
//Guardar el nombre de usuario en las preferencias del usuario
[[NSUserDefaults standardUserDefaults] setValue:self.userName forKey:kNombreUsuario];
//Guardar la contraseña en KeyChain
[SFHFKeychainUtils storeUsername:self.userName andPassword:self.password forServiceName:kServiceName updateExisting:YES error:nil];
}
[self.delegate AEMUserRegistrationSucess];
}
}
The sequence of calls will be:
- -(void)registerUser
- -(void)AEMUserRegistrationVCUserName:(NSString *)un password:(NSString *)pw
- -(void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response
Reading the Forum many questions are answered with [UITextField becomeFirstResponder] as a solution, so maybe I'm missing something important, and I cannot make it work.
The docs say you can override canBecomeFirstResponder to return YES, but how can I override a UITextField method? Is this what needs to be done?
