Part 6 - UIView's Alpha Property

• Changes the transparency (ability to see through) a UIView.
• 0 = Completely invisible
• 1 = Completely solid (opaque)
• Alpha affects the transparency of all subviews
• You can animate this property
• On a label, the alpha property affects the text
• On a button, the alpha property also affects the text
• If you want to preserve Alpha on text (make opaque) and make the rest partially transparent then set the Opacity of the Background Color
  
• Changing the Alpha property of a view does not affect its parent view's Alpha
• If Alpha is less than 1 then you should uncheck the Opaque property (set to false)
  
• If Alpha is set to zero, the control no longer accepts inputs or touches. For example, a UIButton that has it's Alpha set to zero can no longer be clicked.