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iPhone: Slide view up and down to match keyboard appearing and disappearing

/ Published in: Objective C
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  1. - (void)viewDidLoad
  2. {
  3.     [[NSNotificationCenter defaultCenter]
  4.      addObserver:self
  5.      selector:@selector(keyboardWillShow:)
  6.      name:UIKeyboardWillShowNotification
  7.      object:nil];
  8.     [[NSNotificationCenter defaultCenter]
  9.      addObserver:self
  10.      selector:@selector(keyboardWillHide:)
  11.      name:UIKeyboardWillHideNotification
  12.      object:nil];
  13. }
  14.  
  15. - (void)dealloc
  16. {
  17.     [[NSNotificationCenter defaultCenter] removeObserver:self];
  18. }
  19.  
  20. - (void)keyboardWillShow:(NSNotification *)notification {
  21.     CGRect start, end;
  22.  
  23.     // position of keyboard before animation
  24.     [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] getValue:&start];
  25.     // and after..
  26.     [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&end];
  27.  
  28.     double duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  29.     int curve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];
  30.  
  31.     // slide view up..
  32.     [UIView beginAnimations:@"foo" context:nil];
  33.     [UIView setAnimationDuration:duration];
  34.     [UIView setAnimationCurve:curve];
  35.     self.view.frame = CGRectMake(0, -end.size.width, 480, 320);
  36.     [UIView commitAnimations];
  37. }
  38.  
  39. - (void) keyboardWillHide:(NSNotification *)notification {
  40.     double duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  41.     int curve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];
  42.  
  43.     // slide view down
  44.     [UIView beginAnimations:@"foo" context:nil];
  45.     [UIView setAnimationDuration:duration];
  46.     [UIView setAnimationCurve:curve];
  47.     self.view.frame = CGRectMake(0, 0, 480, 320);
  48.     [UIView commitAnimations];
  49. }

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