If the all value is 1 or 0, the ChartYAxis is error

[roselind]

version：2.2.5

[danielgindi]

ChartYAxis is not "error". These are the values it can render, between 0 and 1.
You can control that with granularity. You could have found issues here that talk about it...

[roselind]

If I set the following properties：
leftAxis.granularity = 0.01;
leftAxis.granularityEnabled = YES;
leftAxis.startAtZeroEnabled = YES;
leftAxis.drawTopYLabelEntryEnabled =YES;
leftAxis.axisMinValue = 0.01;
the all data is 1 , ChartYAxis value is 0，0，0，1，1，1

If I set the following properties：
leftAxis.granularity = 1;
leftAxis.granularityEnabled = YES;
leftAxis.startAtZeroEnabled = YES;
leftAxis.drawTopYLabelEntryEnabled =YES;
leftAxis.axisMinValue =0.01;
the all data Less than 1 , ChartYAxis value is null

if the all data is 0 , No line drawing