Define xValues without .map method? about swiftcharts

[ivnsch]

You don't have to use map. The chart just needs an array of ChartAxisValue. How you generate this array is up to you. The examples use map because it makes the code easier to read (this has a performance penalty though, since it iterates over all the array, but it's irrelevant for small datasets).

For numbers you can use ChartAxisValueFloat, where you can pass a formatter. ChartAxisValue should not be instantiated directly (this is like an "abstract class" if you are familiar with that). This class doesn't have any information about how to display the double, if it generated labels and you pass e.g. 2.3423422342425 it would show all the decimal digits and that's in most cases not what you want.

So you can simply:

let xValues = [
    ChartAxisValueFloat(1),
    ChartAxisValueFloat(2.5),
    ChartAxisValueFloat(3)
]

(This will use the default formatter which shows max 2 fraction digits - if you need something different, pass it to the initializer).

[sniis84]

I've tried several times but your example helped me figuring out that a CGFloat is needed by the library.
I just had to use CGFloat(X[i]) in my code to solve it.
I suggest to add documentation about that in the method definition while the use types in the commands

[ivnsch]

Actually, you have a point - there's no real reason to use CGFloat here. Somebody changed recently the internal representation to Double (because CGFloat causes problems with dates), so it's converted to Double anyways. It makes sense to replace ChartAxisValueFloat with ChartAxisValueDouble. I'll leave this open as an enhancement issue.

Also, the behaviour/documentation of ChartAxisValue has to be improved, such that it's clear that it's not meant to be instantiated directly.

[ivnsch]

Improvements implemented