Make superview relationship implicit

[ajfigueroa]

For example, when we want to layout a view with respect to it's superview we usually have to explicitly pass in the view which doesn't look as readable

Given a viewA and a subview viewB that we're trying to make the top match

viewB.applyLayout([
    .matchTopTo(viewA, withOffset: 10.0)
])

This could be better expressed by inferring the superview relationship:

view.applyLayout([
    .matchTopToParent(withOffset: 10.0)
])

[gyfelton]

If parent is nil (no superview), what's the expected behaviour of this call matchTopToParent?

[ajfigueroa]

Let's look at this example:

// viewA has no superview
viewA.applyLayout([
    .matchTopToParent(withOffset: 10.0)
])

We would be saying "match the top of viewA to nil with an offset of 10".

If a view has no superview and someone calls matchTopToParent then I would expect this method to either throw an exception or perform a no-op.
What do you think?

[gyfelton]

I say no op so matchToParent is just a convenience call to matchTopTo() with return early if cannot resolve superview