IOS - Customization for Donut Series

[Neha]

Hello,

I was wondering on how to customize the color of each donut in the donut series.

It seems its not the same way of doing it as the bar charts.


Thank you:)

[Julian Benkov]

Hello Priya,

Thank you for writing us.

Colors of pie/donut chart series can be customized by implementing the TKChartDelegate protocol and handling its paletteItemForSeries method. The following code snippet demonstrates this:

#import <TelerikUI/TelerikUI.h>

@interface PieChart () <TKChartDelegate>
@end

@implementation PieChart

- (void)viewDidLoad
{
    [super viewDidLoad];

    TKChart *pieChart = [[TKChart alloc] initWithFrame:self.view.bounds];
    pieChart.delegate = self;
    [self.view addSubview:pieChart];

//...

-(TKChartPaletteItem *)chart:(TKChart *)chart paletteItemForSeries:(TKChartSeries *)series atIndex:(NSUInteger)index
{
    CGFloat hue = ( arc4random() % 256 / 256.0 );
    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;
    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;
    UIColor *fillColor = [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
    return [[TKChartPaletteItem alloc] initWithFill:[TKSolidFill solidFillWithColor:fillColor]];
}

@end

I hope this helps. Do not hesitate to contact us, if you need further assistance.

Regards,
Julian Benkov
Telerik