Facebook SDK dismiss keyboard implemention

UIKeyboardNotifications.m

///////////////////////////////////////////////////////////////////////////////////////////////////
// UIKeyboardNotifications

BOOL _showingKeyboard;

static CGFloat kPadding = 0;
static CGFloat kBorderWidth = 10;

static BOOL FBIsDeviceIPad() {
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 30200
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        return YES;
    }
#endif
    return NO;
}

- (void)keyboardWillShow:(NSNotification *)notification {

    _showingKeyboard = YES;

    if (FBIsDeviceIPad()) {
        // On the iPad the screen is large enough that we don't need to
        // resize the dialog to accomodate the keyboard popping up
        return;
    }

    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsLandscape(orientation)) {
        _webView.frame = CGRectInset(_webView.frame,
                                     - (kPadding + kBorderWidth),
                                     - (kPadding + kBorderWidth));
    }
}

- (void)keyboardWillHide:(NSNotification *)notification {
    _showingKeyboard = NO;

    if (FBIsDeviceIPad()) {
        return;
    }
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsLandscape(orientation)) {
        _webView.frame = CGRectInset(_webView.frame,
                                     kPadding + kBorderWidth,
                                     kPadding + kBorderWidth);
    }
}