Sets the opacity of the interface object.
- watchOS 2.0+
A floating-point number in the range
0represents totally transparent and
1represents totally opaque.
Use this property to make an object fully or partially transparent. A partially transparent object allows the color or background image associated with the containing group or interface controller show through. A fully transparent object cannot be seen but continues to occupy space in your interface.
Changes to the alpha value of an object are animatable.