Chart's legend isn't scrollable and gets a huge size when many elements on a chart

[Oleg]

I created a pie chart:

TKChart *c = [[TKChart alloc] initWithFrame:self.view.bounds];


    NSMutableArray *ar = [NSMutableArray new];
    for (int i = 0; i < 20; i++) {
        TKChartDataPoint *p = [[TKChartDataPoint alloc] initWithValue:@(1) name:[NSString stringWithFormat:@"Point %d",i]];
        [ar addObject:p];
    }
    TKChartPieSeries *series = [[TKChartPieSeries alloc] initWithItems:ar];
    
    [c addSeries:series];
    c.legend.hidden = NO;

    [self.view addSubview:c];
    TKChartLegendContainer *cont = c.legend.container;
//    cont.stack.stretchMode = TKLayoutStretchModeVertical;
    cont.stack.alignmentMode = TKLayoutAlignmentModeHorizontalCenter;
    cont.stack.orientation = TKStackLayoutOrientationHorizontal;
    cont.stack.stretchMode = TKLayoutStretchModeHorizontal;

Doesn't matter what I do to the legend configuration, I can't make the legend's container resize or move to an appropriate position.


I want the legend to be scrollable (It inherits from UIScrollView) and I want it to be centred above the pie chart. How can this be achieved?

Thanks,

[Adrian]

Hello Avner,

Thank you for writing.

The easiest way to achieve the described scenario is to create new legend instance and then add it to the view hierarchy. This way you can easily configure the position and size of the legend view. The following code snippet shows how to create a legend that is centred above a pie series:

TKChartLegendView *legendView = [[TKChartLegendView alloc] initWithChart:_chart];
legendView.frame = CGRectMake( _chart.bounds.size.width / 2 - 40, 20, 80, 100);
legendView.container.stack.alignmentMode = TKLayoutAlignmentModeRight;
[self.view addSubview:legendView];
[legendView reloadItems];

Currently TKChartLegendView does not support scrolling. However this is a feature that we are planning to implement in a future version. It is already logged in our feedback portal. Feel free to vote/comment.

I hope this helps. We will be glad to help in case you have further questions.

Regards,
Adrian
Telerik