DateTime xAxis question

[Konstantinos]

Hello everyone,

I'm trying to plot a temperature against time graph that spans across for example the last 24hrs and my xAxis is DateTime with this configuration:

         let xAxis = chart.xAxis as! TKChartDateTimeAxis
        xAxis.style.lineStroke = TKStroke(color: UIColor.blueColor())
        xAxis.majorTickIntervalUnit = TKChartDateTimeAxisIntervalUnit.Hours
        xAxis.majorTickInterval = 4
        xAxis.style.majorTickStyle.ticksHidden = false
        xAxis.range = TKRange(minimum: xMin, andMaximum: xMax)

 

The end result looks like this:

 

What I'm missing (if possible) is to "show" the date has changed, so before 00:00 to show yesterday's date (e.g. 12/05) and after 00:00 to show today's date (13/05) so it is more 'user friendly' is this something possible?

 

Thanks!

 

[Konstantinos]

The attachment... hopefully it works this time.

[Sophi]

Hey, Konstantinos

You can show dates with hours on your xAxis by adopting TKChartDelegate protocol and implementing its chart:textForAxis:value:atIndex: method:

- (NSString *)chart:(TKChart *)chart textForAxis:(TKChartAxis *)axis value:(id)value atIndex:(NSUInteger)index
{
    if (axis.position == TKChartAxisPositionBottom) {
        NSDateFormatter *formatter = [NSDateFormatter new];
        formatter.dateFormat = @"d hh:mm";
        return [formatter stringFromDate:value];
    }
    return [NSString stringWithFormat:@"%@", value];
}

Do not forget to set the delegate property of TKChart:

chart.delegate = self;

I hope this helps.

Regards,
Sophi
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