UITextField shouldChangeCharactersInRange Delegate not working - iphone

Question

I am having trouble with a new view I have created, I have a registration view that has a single UITextField on it and a UIButton.
I call this view from another view like so
//otherview.m
- (void)viewDidLoad
{
[super viewDidLoad];
RegistrationAlertViewController *regreg = [[RegistrationAlertViewController alloc] init];
[self.view addSubview:regreg.view];
}
Then I create my regregview like this
//regregView.h
#import <UIKit/UIKit.h>
#interface RegistrationAlertViewController : UIViewController <UITextFieldDelegate> {
// textfields for registration
IBOutlet UITextField *registrationTextFieldA;
}
// textfields for registration
#property (strong, nonatomic) IBOutlet UITextField *registrationTextFieldA;
#end
//regregView.m
#import "RegistrationAlertViewController.h"
#interface RegistrationAlertViewController ()
#end
#implementation RegistrationAlertViewController
#synthesize registrationTextFieldA;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
registrationTextFieldA = [[UITextField alloc] init];
registrationTextFieldA.delegate = self;
[registrationTextFieldA becomeFirstResponder];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if([textField.text length] > 4)
{
//Get next TextField... A simple way to do this:
// UITextField *newTextField = [textField.superview viewWithTag:(textField.tag+1)];
// [newTextField becomeFirstResponder];
return NO;
//remember to set the tags in order
}
return YES; //you probably want to review this...
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if((textField.text.length + string.length) > 4)
{
//Get next TextField... A simple way to do this:
// UITextField *newTextField = [textField.superview viewWithTag:(textField.tag+1)];
// [newTextField becomeFirstResponder];
//remember to set the tags in order
}
return YES; //you probably want to review this...
}
#end
I have the two delegates in my regregView.m
textFieldShouldBeginEditing
shouldChangeCharactersInRange
for some bizarre reason textFieldShouldBeginEditing is entered when the view first loads but then when I start entering characters into registrationTextFieldA shouldChangeCharactersInRange is never being entered for some bizarre reason.
any help figuring out why my delegates are not working properly would be greatly appreciated.

Answer 1

Include UITextFielDelegate category in yourClass.h file and Try this code .
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
int length = textField.text.length - range.length + string.length;
if(length > 4)
{
return NO;
}
return YES;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if([textField.text length] > 4)
{
return NO;
}
return YES; //you probably want to review this...
}
I hope it helps you.

Answer 2

Don't allocate UITextField instance in viewDidLoad method. Replace you code with this :
- (void)viewDidLoad
{
registrationTextFieldA.delegate = self;
[registrationTextFieldA becomeFirstResponder];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
Hope it helps you.

Answer 3

Add UItextField delegate from your xib outlet and declare delegate protocol <uitextfielddelegate> in your .h file.
Definitely it will work fine for You.
Good Luck !!!!

Answer 4

A wild guess here.
The problem is in your otherview.m
- (void)viewDidLoad
{
[super viewDidLoad];
RegistrationAlertViewController *regreg = [[RegistrationAlertViewController alloc] init];
[self.view addSubview:regreg.view];
}
Try making a strong property of RegistrationAlertViewController on top of your otherview.m
#property (nonatomic, strong) RegistrationAlertViewController *regreg;
Then in your view did load, you can do
- (void)viewDidLoad
{
[super viewDidLoad];
RegistrationAlertViewController *regreg = self.regreg;
if (regreg == nil)
{
self.regreg = [[RegistrationAlertViewController alloc] init];
}
[self.view addSubview:regreg.view];
}
Hope that works.. Just seems like a similar problem I ran into before.. Good luck

Answer 5

As you are initializing the view while implementing this file.So set delegate in init method not in viewDidLoad.
#synthesize registrationTextFieldA;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
registrationTextFieldA = [[UITextField alloc] init];
registrationTextFieldA.delegate = self;
[registrationTextFieldA becomeFirstResponder];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}