moving view when keyboard pops up..

CGFloat animatedDistance;

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;

static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;

static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;

static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;

static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;

 

 

 

#pragma mark Textfield Delegates

– (BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

 

 

– (void)textFieldDidBeginEditing:(UITextField *)textField

{

   //ErrorMsg.text = @””;

    CGRect textFieldRect =

[self.view.window convertRect:textField.bounds fromView:textField];

    CGRect viewRect =

[self.view.window convertRect:self.view.bounds fromView:self.view];

 

CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;

    CGFloat numerator =

midline – viewRect.origin.y

– MINIMUM_SCROLL_FRACTION * viewRect.size.height;

    CGFloat denominator =

(MAXIMUM_SCROLL_FRACTION – MINIMUM_SCROLL_FRACTION)

* viewRect.size.height;

    CGFloat heightFraction = numerator / denominator;

 

if (heightFraction < 0.0)

    {

        heightFraction = 0.0;

    }

    else if (heightFraction > 1.0)

    {

        heightFraction = 1.0;

    }

 

UIInterfaceOrientation orientation =

[[UIApplication sharedApplication] statusBarOrientation];

    if (orientation == UIInterfaceOrientationPortrait ||

        orientation == UIInterfaceOrientationPortraitUpsideDown)

    {

        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);

    }

    else

    {

        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);

    }

 

CGRect viewFrame = self.view.frame;

    viewFrame.origin.y -= animatedDistance;

    

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationBeginsFromCurrentState:YES];

    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    

    [self.view setFrame:viewFrame];

    

    [UIView commitAnimations];

}

 

– (void)textFieldDidEndEditing:(UITextField *)textField

{

    if (textField==tfEmail) {

      BOOL boolValidEmail=  [self NSStringIsValidEmail:tfEmail.text];

        if (!boolValidEmail) {

            

            [[[UIAlertView alloc]initWithTitle:@”Email alert” message:@”Invalid Email format” delegate:self cancelButtonTitle:@”Ok” otherButtonTitles:nil, nil]show ];

            registerBtn.enabled=NO;

 

        }

    }

    

    

    if (textField==tfConfirmEmail) {

        

        if (tfEmail.text!=tfConfirmEmail.text ) {

            [[[UIAlertView alloc]initWithTitle:@”Email alert” message:@”Emails doesn’t match” delegate:self cancelButtonTitle:@”Ok” otherButtonTitles:nil, nil]show ];

            registerBtn.enabled=NO;

 

        }

    }

    

    

    

    CGRect viewFrame = self.view.frame;

    viewFrame.origin.y += animatedDistance;

    

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationBeginsFromCurrentState:YES];

    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

    

    

    

}

 

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