BUG::: leftAxis.axisMinValue !!!=== 0.0

[dsencheng]

[liuxuan30]

Please be more specific how this happens in your first three charts. Usually you should see it's fine. Have you call notifyDataSetChanged after you set leftAxis.axisMinValue?

[dsencheng]

@liuxuan30 可以中文描述么？ 在BarChartViewController.m 75行 注释掉leftAxis.axisMinValue = 0.0，然后运行，不停的push和pop操作，每次出现的底部高度不一样。预期的是一直在X轴上。

Translated by @liuxuan30:
If we comment out BarChartViewController - Line 75: leftAxis.axisMinValue = 0.0
while pushing and poping the bar chart, the minimum y value seems changing, not right on the x axie zero line.

[liuxuan30]

@dsencheng I encourage you use English, because more people can help you. I have added a translation.

Now back to the topic: I'm not sure if this is a bug or not.

By default, if you do nothing, the y axis range is calculated via y axis renderer's computeAxisValues(), it takes yMin and yMax as arguments. In ChartYAxis, calculate() is calculating _axisMinimum, which is yMin later.

Now in your case, you let the library calculate y axis range for you, so it will go to:

        // bottom-space only effects non-custom min
        if !_customAxisMin
        {
            let bottomSpace = range * Double(spaceBottom)
            _axisMinimum = min - bottomSpace
        }

and axisMinimum is a small negative now. So, if you want to always start from zero, you should explicitly call leftAxis.axisMinValue = 0.0

[dsencheng]

@liuxuan30 抱歉，英文实在不好。我还是用中文描述下好了。这个问题是柱状图底部不在X轴上，它偏移了。我希望柱状图固定在X轴上，并且我不需要设置axisMinValue = 0.0

[liuxuan30]

if you want to make bar stay right on x axis, you have to set axisMinValue = 0.0