Line chart with blank data show Y axis label incorrect on iPhone 5

[ybqboy]

I met this issue, when I create a line chart with blank data, only on iPhone 5, it shows like this

as you can see, the Y axis label are all in the corner.
I debugged into the code and found it seems like there is an issue in here, the trans got two NAN values.

one more thing, if has data, the issue gone and everything seems good. and on iPhone 6 and iPhone 7 everything is fine.

[ybqboy]

can anybody help to check this issue?
also with blank data, the chart will crash if the scale is enabled. so am i wrong to use the blank data chart? here is my code

_chartView.delegate = self;

_chartView.chartDescription.enabled = NO;

_chartView.dragEnabled = YES;
[_chartView setScaleEnabled:YES];
_chartView.pinchZoomEnabled = NO;
_chartView.drawGridBackgroundEnabled = NO;
_chartView.highlightPerDragEnabled = YES;
_chartView.scaleYEnabled = NO;

_chartView.backgroundColor = UIColor.whiteColor;

_chartView.legend.enabled = NO;
_chartView.maxVisibleCount = 4000;


ChartXAxis *xAxis = _chartView.xAxis;
xAxis.labelPosition = XAxisLabelPositionBottom;
xAxis.labelFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:10.f];
xAxis.labelTextColor = [UIColor colorWithRed:255/255.0 green:192/255.0 blue:56/255.0 alpha:1.0];
xAxis.drawAxisLineEnabled = NO;
xAxis.drawGridLinesEnabled = NO;
xAxis.centerAxisLabelsEnabled = YES;
xAxis.granularity = 180.0;
xAxis.valueFormatter = [[DateValueFormatter alloc] init];

NoOverlappingLabelsXAxisRenderer *render = [[NoOverlappingLabelsXAxisRenderer alloc] initWithViewPortHandler:_chartView.viewPortHandler xAxis:_chartView.xAxis transformer:_chartView.xAxisRenderer.transformer];
_chartView.xAxisRenderer = render;


ChartYAxis *leftAxis = _chartView.leftAxis;
leftAxis.labelFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:12.f];
leftAxis.labelTextColor = [UIColor colorWithRed:51/255.0 green:181/255.0 blue:229/255.0 alpha:1.0];
leftAxis.drawGridLinesEnabled = YES;
leftAxis.granularityEnabled = YES;
leftAxis.axisMinimum = 0;
leftAxis.axisMaximum = 25;
leftAxis.labelCount = 5;

_chartView.rightAxis.enabled = NO;

_chartView.legend.form = ChartLegendFormLine;

LineChartData *data = [[LineChartData alloc] initWithDataSets:@[]];
_chartView.data = data;

thanks

[liuxuan30]

I checked what you said, with Line Chart in ChartsDemo:

On iPhone 5S (which works perfect with empty data sets):

On iPhone 5:

So I suspect it's due to 32bit and 64bit precising issue, as CGFloat is Float on 32bit device, while it's Double on 64bit device.

It seems you should come up with a workaround for iPhone 5 only, like manually use Dbouble to recalcuate the matrix and feed _matrixValueToPx with correct values.

But before this, what's the population of your app using iPhone 5? It already 4 gens after iPhone 5 and to us, it's just as ancient as iPhone 4S. Ask yourself do you really need to support them?

[aelam]

have you fixed this? I've got this problem too.