Chart trackball not working on 2016 Q1

[Robert]

I added code to enable a chart trackball according to the documentation, and when I run my chart--nothing happens.  I do have my delegate configured properly, and can capture other events etc without problems.

Just to compare, I compiled and ran the Chart/Trackball annotation part of the TelerikUIExamples project. It doesn't display a trackball either. Tried this both with the Swift and Objective-C versions of the demo program. I tried running the program on the latest simulator image, and an older iOS 8.4 image -- neither displays the trackball information that's setup in the code.

 

Is the trackball feature broken in Q1/16? 

 

I'm running: 

Telerik UI iOS Q1/2016

Xcode 7.2 on OSX 10.11.3

Physical Device: iOS 9.2.1 on iPad Air 2

 

 

[Yoanna]

Hello Robert, 

Thank you for contacting us.

I have tested out  TKChartTrackball in both our SDK examples and a brand new project on a physical device it seem all works correctly. 
In order to setup trackball correctly you should do these steps:

1. Allow trackball 

_chart.allowTrackball = YES;

2. Set the delegate to TKChart

_chart.delegate = self;

3. Override delegate's -chart:trackballDidTrackSelection method

- (void)chart:(TKChart *)chart trackballDidTrackSelection:(NSArray *)selection
{
    if (selection.count>0) {
        id value = ((TKChartSelectionInfo*)selection[0]).dataPoint.dataXValue;
        NSString *str = [NSString stringWithFormat:@"Pos = %@", value];
        chart.trackball.tooltip.text = str;
    }
}

By default TKChartTrackball is designed to show after 0.5 seconds hold gesture. You can control this by setting the minimumPressDuration property.

I hope this helps. If the issue still occur, please send us some code or a small test project where we can see the issue represented and investigate this further.

Looking forward to your reply.

Regards,
Yoanna
Telerik