Overriding DefaultAxisValueFormatter Doesn't Work

[giantramen]

• I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

Overrode Default Axis Formatter

class InvertedAxisFormatter: DefaultAxisValueFormatter {

    @objc override func stringForValue(_ value: Double, axis: AxisBase?) -> String {
        return super.stringForValue(value.isAlmostZero() ? 0 : -value, axis: axis)
    }
}

What did you expect to happen?

My method gets called.

What happened instead?

The getter for the base formatter checks if the decimals match and replaces my formatter.

Charts Environment

Charts version/Branch/Commit Number: 7ac4a05
Xcode version: 11.3.1
Swift version: 5.0
Platform(s) running Charts: iOS
macOS version running Xcode: 10.15.4