Adjust table/collection view height for keyboard.

gistfile1.txt

//Set up your tableview/collection view in IB with a bottom layout constraint with an IBOutlet.
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(adjustTableViewHeight:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
}

- (void)adjustTableViewHeight:(NSNotification*)notification {
  CGRect keyboardFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
  CGPoint keyboardOriginInView = [self.view.window convertPoint:keyboardFrame.origin toView:self.view];
  self.tableViewBottomConstraint.constant = CGRectGetHeight(self.view.frame) - keyboardOriginInView.y;
}