Keyboard View Handling

KeyboardViewHandling

//H File should have
//CGFloat animatedDistance;

const CGFloat KEYBOARD_ANIMATION_DURATION   = 0.3;
const CGFloat MINIMUM_SCROLL_FRACTION       = 0.2;
const CGFloat MAXIMUM_SCROLL_FRACTION       = 0.8;
const CGFloat PORTRAIT_KEYBOARD_HEIGHT      = 216;
const CGFloat LANDSCAPE_KEYBOARD_HEIGHT     = 162;

#pragma mark - TextField Delegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return YES;
}

-(void) textFieldDidBeginEditing:(UITextField *)textField {
    if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
    {
        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)
        {
            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(UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPhone)
    {
        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];
    }
}