observe keyboard show or hidden

pragma mark observe keyboard show or hide

• (void) registerForKeyboardNotifications
  {
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];
  }

• (void) keyboardWasShown:(NSNotification *) notif
  {
  NSDictionary *info = [notif userInfo];
  NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
  CGSize keyboardSize = [value CGRectValue].size;

  NSLog(@”keyBoard:%f”, keyboardSize.height); //216
  }

• (void) keyboardWasHidden:(NSNotification *) notif
  {
  NSDictionary *info = [notif userInfo];
  NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
  CGSize keyboardSize = [value CGRectValue].size;

  NSLog(@”keyboardWasHidden keyBoard:%f”, keyboardSize.height);

}

在做一个份额选择的界面时，键盘弹出会遮盖大部分控件；只好根据键盘是否弹出来设置被遮盖控件的superView。记录下。