Animate DatePicker hide/show in StackView
<p>How to properly animate datePicker appearance/disappearance in stackView? Currently I tried like this:</p>

<pre><code>UIView.animateWithDuration(0.3, animations: {
    self.datePickerView.hidden = !self.datePickerView.hidden
})
</code></pre>

<p>This causes problems with hiding animation - it starts nicely and then in the end datePickerView flashes a little bit at the top of where datePicker was. Any suggestions?</p>