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Automate the position of UITextField w.r.t the keyboard

/ Published in: Objective C
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move the position of the textfield with respect to the position of the keyboard. After the last textfield has some text entered, resign the keyboard from the view

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  1. CGFloat animatedDistance;
  2. static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
  3. static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
  4. static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
  5. static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
  6. static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;
  7.  
  8.  
  9.  
  10. - (void)textFieldDidBeginEditing:(UITextField *)textField
  11. {
  12.     CGRect textFieldRect =[self.view.window convertRect:textField.bounds fromView:textField];
  13.     CGRect viewRect =[self.view.window convertRect:self.view.bounds fromView:self.view];
  14. 	CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
  15.     CGFloat numerator =	midline - viewRect.origin.y	- MINIMUM_SCROLL_FRACTION * viewRect.size.height;
  16.     CGFloat denominator =(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)* viewRect.size.height;
  17.     CGFloat heightFraction = numerator / denominator;
  18. 	if (heightFraction < 0.0)
  19.     {
  20.         heightFraction = 0.0;
  21.     }
  22.     else if (heightFraction > 1.0)
  23.     {
  24.         heightFraction = 1.0;
  25.     }
  26. 	UIInterfaceOrientation orientation =
  27. 	[[UIApplication sharedApplication] statusBarOrientation];
  28.     if (orientation == UIInterfaceOrientationPortrait ||
  29.         orientation == UIInterfaceOrientationPortraitUpsideDown)
  30.     {
  31.         animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
  32.     }
  33.     else
  34.     {
  35.         animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
  36.     }
  37. 	CGRect viewFrame = self.view.frame;
  38.     viewFrame.origin.y -= animatedDistance;
  39.  
  40.     [UIView beginAnimations:nil context:NULL];
  41.     [UIView setAnimationBeginsFromCurrentState:YES];
  42.     [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
  43.  
  44.     [self.view setFrame:viewFrame];
  45.  
  46.     [UIView commitAnimations];
  47.  
  48. }
  49.  
  50.  
  51.  
  52. - (void)textFieldDidEndEditing:(UITextField *)textField
  53. {
  54.     CGRect viewFrame = self.view.frame;
  55.     viewFrame.origin.y += animatedDistance;
  56.  
  57.     [UIView beginAnimations:nil context:NULL];
  58.     [UIView setAnimationBeginsFromCurrentState:YES];
  59.     [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
  60.  
  61.     [self.view setFrame:viewFrame];
  62.  
  63.     [UIView commitAnimations];
  64. }
  65.  
  66. - (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
  67.  
  68. }

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