iOS keyboard notification

gistfile1.m

- (void)setKeyboardNotification{
    NSNotificationCenter *c = [NSNotificationCenter defaultCenter];
    [c addObserver:self selector:@selector(notifKeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [c addObserver:self selector:@selector(notifKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)unsetKeyboardNotification {
    NSNotificationCenter *c = [NSNotificationCenter defaultCenter];
    [c removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [c removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)notifKeyboardWillShow:(NSNotification *)aNotification {
    NSDictionary* info = aNotification.userInfo;
    // この view から見た座標系に変換する
    CGRect keyboardFrameEnd = [self.view.window convertRect:[info[UIKeyboardFrameEndUserInfoKey] CGRectValue] toView:self.view];
    [UIView animateWithDuration:[info[UIKeyboardAnimationDurationUserInfoKey] floatValue]
                          delay:0
                        options:[info[UIKeyboardAnimationCurveUserInfoKey] intValue]
                     animations:^{
                         self.lc_bottom.constant = self.view.bounds.size.height - keyboardFrameEnd.origin.y;
                         [self.view layoutIfNeeded];
                     }
                     completion:^(BOOL finished){
                     }
     ];
}
- (void)notifKeyboardWillHide:(NSNotification *)aNotification {
    NSDictionary* info = aNotification.userInfo;
    [UIView animateWithDuration:[info[UIKeyboardAnimationDurationUserInfoKey] floatValue]
                          delay:0
                        options:[info[UIKeyboardAnimationCurveUserInfoKey] intValue]
                     animations:^{
                         self.lc_bottom.constant = 0;
                         [self.view layoutIfNeeded];
                     }
                     completion:^(BOOL finished){
                     }
     ];
}
- (void)closeSoftKeyboard:(UIGestureRecognizer*)recog {
    [self.view endEditing:YES];
}