Provide rex_prepareForReuse for UITableView and UICollectionView components

[dmcrodrigues]

Now that we have rex_toTriggerSignal, thanks to @RuiAAPeres, we may bring a swifty version of rac_prepareForReuseSignal. It's only syntactic sugar but it can be quite useful.

Example:

self.label.rex_text <~
    titleProperty
       .producer
       .takeUntil(self.rex_prepareForReuseSignal)

[dmcrodrigues]

In case of positive feedback about adding this I can extend it to UICollectionView's components.

[neilpa]

👍 on the idea. I'd go with rex_prepareForReuseTrigger for the name though (or maybe just rex_prepareForReuse).

[RuiAAPeres]

I like rex_prepareForReuse, so the naming is not tied to a usage context.

[dmcrodrigues]

I agree, rex_prepareForReuse seems a good option. I'll update the PR accordingly and extend it to also include each component of UICollectionView.

[dmcrodrigues]

@RuiAAPeres @neilpa I noticed that there are other signals using this convention rex_{name}Signal, e.g. rex_willDeallocSignal or rex_viewDidDisappearSignal, and they all share the same signature. Should we also change them to promote consistency?

[RuiAAPeres]

I agree. Open a new PR for that.

[dmcrodrigues]

I adopted another approach to provide this, instead of having the same property in each class I created a protocol Reusable and using protocol extensions I shared the implementation of rex_prepareForReuse between each class. I think this can be beneficial to avoid repeating exactly the same code over and over.

[RuiAAPeres]

Remove Foundation, for simplicity sake ( #103 )

[dmcrodrigues]

All fixed (I think) 🔎

[RuiAAPeres]

Awesome! 👍