I can not set one label on y axis.

[pridra]

Hi, first of all thanks for this awesome library.
We are using CombinedChartView.

What did you do?

I set 1 to the setLabelCount of the YAxis class.

What did you expect to happen?

I can not set one label on y axis.

What happened instead?

I set 0 or 1 to setLabelCount or labelCount, but
they are converted to 2, because
the bottom line (base line) and the top line (ceiling line) are always drawn.

Corresponding code

AxisBase.swift

    /// the number of label entries the axis should have
    /// max = 25,
    /// min = 2,
    /// default = 6,
    /// be aware that this number is not fixed and can only be approximated
    @objc open var labelCount: Int
    {
        get
        {
            return _labelCount
        }
        set
        {
            _labelCount = newValue
            
            if _labelCount > 25
            {
                _labelCount = 25
            }
            if _labelCount < 2
            {
                _labelCount = 2
            }
            
            forceLabelsEnabled = false
        }
    }

AxisRendererBase.swift

    /// Sets up the axis values. Computes the desired number of labels between the two given extremes.
    @objc open func computeAxisValues(min: Double, max: Double)
    {
        guard let axis = self.axis else { return }
        
        let yMin = min
        let yMax = max
        
        let labelCount = axis.labelCount
        let range = abs(yMax - yMin)
        
        if labelCount == 0 || range <= 0 || range.isInfinite
        {
            axis.entries = [Double]()
            axis.centeredEntries = [Double]()
            return
        }

YAxisRenderer.swift

    /// draws the y-labels on the specified x-position
    @objc internal func drawYLabels(
        context: CGContext,
        fixedPosition: CGFloat,
        positions: [CGPoint],
        offset: CGFloat,
        textAlign: NSTextAlignment)
    {
        guard
            let yAxis = self.axis as? YAxis
            else { return }
        
        let labelFont = yAxis.labelFont
        let labelTextColor = yAxis.labelTextColor
        
        let from = yAxis.isDrawBottomYLabelEntryEnabled ? 0 : 1
        let to = yAxis.isDrawTopYLabelEntryEnabled ? yAxis.entryCount : (yAxis.entryCount - 1)
        
        for i in stride(from: from, to: to, by: 1)
        {

We only need bottom line and bottom label.

Charts Environment

Charts version/Branch/Commit Number:
3.0.4
Xcode version:
9.1
Swift version:
4.0.2
macOS version running Xcode:
10.13.6

Thanks again!

[liuxuan30]

have you tried forceLabelsEnabled? Otherwise, override computeAxisValues and make axis.entries contains only one data

        // force label count
        if axis.isForceLabelsEnabled
        {
            let step = Double(range) / Double(labelCount - 1)
            
            // Ensure stops contains at least n elements.
            axis.entries.removeAll(keepingCapacity: true)
            axis.entries.reserveCapacity(labelCount)
            
            var v = yMin
            
            for _ in 0 ..< labelCount
            {
                axis.entries.append(v)
                v += step
            }
            
            n = labelCount
        }