How To Use Hide And Show Keyboard And Set View Animations In UITextField In Objective C

KEYBOARD HIDE AND SHOW AND VIEW ANIMATIONS IN TEXT FIELD

ViewController.h

float animatedDistance;

ViewController.m

- (void)textViewDidBeginEditing:(UITextView *)textView
{
     CGRect textFieldRect=[self.view.window convertRect:textView.bounds fromView:textView];
     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 - 0.2 * viewRect.size.height;
     CGFloat denominator = (0.8 - 0.2) * 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 = floorf(216 * heightFraction);
             }
         else
            {
                   animatedDistance = floorf(140 * heightFraction);
            }

      CGRect viewFrame=self.view.frame;
      viewFrame.origin.y-=animatedDistance;
      [UIView beginAnimations:nil context:NULL];
      [UIView setAnimationBeginsFromCurrentState:YES];
      [UIView setAnimationDuration:0.3];
      [self.view setFrame:viewFrame];
      [UIView commitAnimations];

         // if ([textView.text isEqualToString:@"Enquiry/Request"])
             {
                  // textView.text =@"";
                  // textView.textColor = [UIColor blackColor]; //optional
         // }

           [textView becomeFirstResponder];
}

- (void)textViewDidEndEditing:(UITextView *)textView
{
      CGRect viewFrame = self.view.frame;
      viewFrame.origin.y +=animatedDistance;
      [UIView beginAnimations:nil context:NULL];
      [UIView setAnimationBeginsFromCurrentState:YES];
      [UIView setAnimationDuration:0.3];
      [self.view setFrame:viewFrame];
      [UIView commitAnimations];

         // if ([textView.text isEqualToString:@""]) 
            {
                   // textView.text =@"Enquiry/Request";
                   // textView.textColor = [UIColor darkGrayColor]; //optional
         // }

         [textView resignFirstResponder];
}

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

-(void)textFieldDidEndEditing:(UITextField *)textField
{
     CGRect viewFrame = self.view.frame;
     viewFrame.origin.y +=animatedDistance;
     [UIView beginAnimations:nil context:NULL];
     [UIView setAnimationBeginsFromCurrentState:YES];
     [UIView setAnimationDuration:0.3];
     [self.view setFrame:viewFrame];
     [UIView commitAnimations];
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
     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 - 0.2 * viewRect.size.height;
     CGFloat denominator = (0.8 - 0.2) * 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 = floorf(216 * heightFraction);
        }
        else
        {
                 animatedDistance = floorf(140 * heightFraction);
}

    CGRect viewFrame=self.view.frame;
    viewFrame.origin.y-=animatedDistance;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:0.3];
    [self.view setFrame:viewFrame];
    [UIView commitAnimations];
}