Chart interactions

[prithsharma]

Work in progress

Since I am not very familiar with both Objective-C and Swift, bootstrapping PR for early comments. Apart from general comments, looking for suggestions on the question below:

• Since the implementation for the delegate would mostly remain same for all chart types, how can I write the implementation once instead of copying it over to class definitions of all charts?

[prithsharma]

I tried to add an onSelect property to RNLineChart and use it in the chartValueSelected delegate implementation. Unfortunately, I am facing a weird error that Value of type RNLineChart has no member 'onSelect'. Properties declared in Objective-C should be accessible in Swift class definitions, but I am most probably missing some basic concept.

Concerned commit - ffceb1f

@Jpadilla1 would you be able to help on this? The intermixing of Swift and Objective-C code is making it more confusing for a noob like me.

[prithsharma]

So I made a little progress. In the commit dd3fe04, I was able to get hold of the onSelect property using an instance variable and pass on an event to JS.
@Jpadilla1 please take a look and see if this looks OK to you. I can really use some Objective-C/iOS knowledge here. 😄

[prithsharma]

Selection/unselection selectors work for LineChart now.
@Jpadilla1 please review. If there is a neater way than copying the delegate implementation to all chart class definitions, I'll really appreciate the suggestion.

[prithsharma]

@Jpadilla1 did you get a chance to look at this?

[basequatro]

This a great PR, congrats.

[Jpadilla1]

Sorry for the late response @prithsharma, will take a look at it today.

[prithsharma]

@Jpadilla1 did you get a chance to look at this one?

[L-Jovi]

@prithsharma cool, and I notice the author don't have enough time to continue maintain the project from this issue :(

[wuxudong]

@prithsharma chartValueSelected listener is also implemented at https://github.com/wuxudong/react-native-charts-wrapper . and it is shared among all chart type. may be you will want to take a look