leftAxis line disappears when filling area between two line charts.

[hachinobu]

What did you do?

i use filling area between two line charts.

What did you expect to happen?

A fill should appear between the two line graphs, and the leftAxis line should appear.

What happened instead?

leftAxis line disappears.

not filled	filled

ℹ Please replace this with of what happened instead.

Charts Environment

Charts version/Branch/Commit Number: 3.3.0
Xcode version:10.2
Swift version:5.0
Platform(s) running Charts:iOS 12.2
macOS version running Xcode: 10.14.5

Is there an easy way to solve this problem?

Is it better to customize it according to IFillFormatter or make it inherit from LineChartRenderer?

[hachinobu]

To solve this problem, it is necessary to advance the timing of calling renderer.drawData(context: context) in the draw(_ rect: CGRect) method of BarLineChartViewBase.

However, I am worried about the degradation caused by this change.

I will send a PR if there is no problem, how is it?

    // BarLineChartViewBase.swift
    open override func draw(_ rect: CGRect)
    {
        super.draw(rect)

        guard data != nil, let renderer = renderer else { return }
        
        let optionalContext = NSUIGraphicsGetCurrentContext()
        guard let context = optionalContext else { return }

        // execute all drawing commands
        drawGridBackground(context: context)
        renderer.drawData(context: context) // <-- solve this issue.

[liuxuan30]

please send us a PR, thanks