Custom properties for enum value

[JakeLin]

TBD

Some discussions
#8
#59

[tbaranes]

The current ideas suggested (which could be working) in order to make that thread going further:

1. Wave(up,40,10): MaskType(param1,param2,param3)
2. More AnimatableView's children to add custom designable properties following the shape
3. Other suggestions?

I prefer the first solution, but it could be maybe too hard to use, or improving a bit the syntax to be a bit more swift: Wave(direction:up,width:40,offset:10) (still annoying since the syntax is really strict)

[tbaranes]

Another approach:

public enum Mask {
    case Circle()
    case Star(branches: Int)
    case Wave(up: Bool, width: Int, offset: Int)
}

Mask.Circle()
Mask.Star(branches: 5)
Mask.Wave(up: true, width: 40, offset: 40)

I still missing a nice way to make this working with the interface builder, but I find this approach more swifty.

[JakeLin]

@tbaranes @lexrus came up similar ideas before to use Swiftified enum. But since IB doesn't support enum yet, it can't fix our problem.

I prefer option one, and it can at least move us forward. If we can support option one, we can subclass AnimatableView to support option two if needed.

To get the benefit of Swiftified enum, we can have

public enum Mask {
    case Circle()
    case Star(branches: Int)
    case Wave(up: Bool, width: Int, offset: Int)
}

in code then map the String value e.g. Star(6) to Star(branches:6) for IB. And fall back to default value Star(branches:5) if the user put it wrongly like Star5, Star(12 or Star2)