UITabBar上方的InputAccessoryView

Question

我目前正在尝试将自定义inputAccessoryView置于UITabBar之上。但如下所示，实际inputAccessoryView涵盖了UITabBar。有办法吗？也许通过在inputAccessoryView的超级视图上加上一些底部约束？

- (BOOL)canBecomeFirstResponder {
    return YES;
}


- (UIView *)inputAccessoryView {
    self.inputAccView.delegate = self;
    return self.inputAccView;
}