iOS 10, alpha ignored
<p>I have a custom view. In <code>initWithFrame:</code> I have:</p>

<pre><code>self.backgroundColor = [UIColor colorWithRed:255 green:255 blue:255 alpha:0.8];
</code></pre>

<p>Works on iOS &lt; 10, Doesn't work on iOS 10, alpha ignored and view is just white. 
How to make color transparent on iOS 10 ?</p>