textFieldDidBeginEditing: not getting called

Question

I got the code below from this SO question. I'm trying to slide up textfields when I begin editing (because they otherwise get covered by the iPhone keyboard). However, the log statement reveals that the textFieldDidBeginEditing method is not getting called.

I have the code below in two different subclasses of UIViewController. In one of them, for example, I have a textfield connected from the storyboard to the UIViewController like this

@property (strong, nonatomic) IBOutlet UITextField *mnemonicField;

I moved the textfield up to the top of the view (i.e. not covered by keyboard) so that I could edit it to try to trigger the log statement but it didn't work. The text field otherwise works as expected i.e. the data I enter is getting saved to coreData etc etc.

Can you explain what I might be doing wrong?

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    NSLog(@"The did begin edit method was called");
    [self animateTextField: textField up: YES];
}


- (void)textFieldDidEndEditing:(UITextField *)textField
{
    [self animateTextField: textField up: NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
    const int movementDistance = 180; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed

    int movement = (up ? -movementDistance : movementDistance);

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}

Answer 1

You have not assigned your delegate of UITextField in your ViewController class:

In your viewcontroller.m file, In ViewDidLoad method, do this:

self.mnemonicField.delegate=self; 

In your viewcontroller.h file, do this:

@interface YourViewController : ViewController<UITextFieldDelegate>

Answer 2

You should set up text field delegate to self. Add this line to viewDidLoad method:

self.mnemonicField.delegate = self;

and remember to add this line <UITextFieldDelegate> to conform to that protocol.

You can achieve the same effect in storyboard by control drag from desired UITextField to view controller and select delegate.