In SciChart iOS, it is possible to customize the look and feel of Tooltips on our iOS Chart control. This example demonstrates how to do this using the SCIRolloverModifier.

What can be customized? The actual tooltip style (Border, Background, Size, Opacity) as well as text style (font, font size, font weight). The Marker which intersects the series, the rollover line and also the text formatting of the cursor tooltip itself.

// RolloverCustomizationChartView.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// RolloverCustomizationChartView.m is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

#import "RolloverCustomizationChartView.h"
#import "SCDDataManager.h"
#import "SCDRandomWalkGenerator.h"
#import <SciChart/SCIAxisTooltip+Protected.h>
#import <SciChart/SCIDefaultAxisInfoProvider+Protected.h>
#import <SciChart/SCISeriesTooltipBase+Protected.h>
#import <SciChart/SCISeriesInfoProviderBase+Protected.h>

#pragma mark - Cutsom Tooltips

@interface CustomRolloverAxisTooltip : SCIAxisTooltip
@end
@implementation CustomRolloverAxisTooltip
- (BOOL)updateInternalWithAxisInfo:(SCIAxisInfo *)axisInfo {
    self.text = [NSString stringWithFormat:@"Axis ID: %@\nValue: %@", axisInfo.axisId, axisInfo.axisFormattedDataValue.rawString];
    [self setTooltipBackground:0xff6495ed];
    return YES;
}
@end

@interface FirstCustomXySeriesTooltip : SCIXySeriesTooltip
@end
@implementation FirstCustomXySeriesTooltip
- (void)internalUpdateWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo {
    NSString *string = NSString.Empty;
    string = [string stringByAppendingFormat:@"X: %@\n", seriesInfo.formattedXValue.rawString];
    string = [string stringByAppendingFormat:@"Y: %@\n", seriesInfo.formattedYValue.rawString];
    if (seriesInfo.seriesName != nil) {
        string = [string stringByAppendingFormat:@"%@\n", seriesInfo.seriesName];
    }
    string = [string stringByAppendingString:@"Rollover Modifier"];
    self.text = string;
    
    [self setTooltipBackground:0xffe2460c];
    [self setTooltipStroke:0xffff4500];
    [self setTooltipTextColor:0xffffffff];
}

- (void)onDrawTooltipOverlayInRect:(CGRect)rect {
    [self onDrawTooltipOverlayInRect:rect atCoordinate:self.seriesInfo.xyCoordinate withColor:UIColor.whiteColor];
}
@end

@interface SecondCustomXySeriesTooltip : SCIXySeriesTooltip
@end
@implementation SecondCustomXySeriesTooltip
- (void)internalUpdateWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo {
    NSString *string = @"Rollover Modifier\n";
    if (seriesInfo.seriesName != nil) {
        string = [string stringByAppendingFormat:@"%@\n", seriesInfo.seriesName];
    }
    string = [string stringByAppendingFormat:@"X: %@ ", seriesInfo.formattedXValue.rawString];
    string = [string stringByAppendingFormat:@"Y: %@", seriesInfo.formattedYValue.rawString];
    self.text = string;
    
    [self setTooltipBackground:0xff6495ed];
    [self setTooltipStroke:0xff4d81dd];
    [self setTooltipTextColor:0xffffffff];
}
@end

#pragma mark - Cutsom Info Providers

@interface CustomRolloverAxisSeriesInfoProvider : SCIDefaultAxisInfoProvider
@end
@implementation CustomRolloverAxisSeriesInfoProvider
- (id<ISCIAxisTooltip>)getAxisTooltipInternal:(SCIAxisInfo *)axisInfo modifierType:(Class)modifierType {
    if (modifierType == SCIRolloverModifier.class) {
        return [[CustomRolloverAxisTooltip alloc] initWithAxisInfo:axisInfo];
    } else {
        return [super getAxisTooltipInternal:axisInfo modifierType:modifierType];
    }
}
@end

@interface FirstCustomRolloverSeriesInfoProvider : SCIDefaultXySeriesInfoProvider
@end
@implementation FirstCustomRolloverSeriesInfoProvider
- (id<ISCISeriesTooltip>)getSeriesTooltipInternalWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo modifierType:(Class)modifierType {
    if (modifierType == SCIRolloverModifier.class) {
        return [[FirstCustomXySeriesTooltip alloc] initWithSeriesInfo:seriesInfo];
    } else {
        return [super getSeriesTooltipInternalWithSeriesInfo:seriesInfo modifierType:modifierType];
    }
}
@end
@interface SecondCustomRolloverSeriesInfoProvider : SCIDefaultXySeriesInfoProvider
@end
@implementation SecondCustomRolloverSeriesInfoProvider
- (id<ISCISeriesTooltip>)getSeriesTooltipInternalWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo modifierType:(Class)modifierType {
    if (modifierType == SCIRolloverModifier.class) {
        return [[SecondCustomXySeriesTooltip alloc] initWithSeriesInfo:seriesInfo];
    } else {
        return [super getSeriesTooltipInternalWithSeriesInfo:seriesInfo modifierType:modifierType];
    }
}
@end

static int const PointsCount = 200;

#pragma mark - Chart Initialization

@implementation RolloverCustomizationChartView

- (void)initExample {
    id<ISCIAxis> xAxis = [SCINumericAxis new];
    xAxis.axisInfoProvider = [CustomRolloverAxisSeriesInfoProvider new];
    id<ISCIAxis> yAxis = [SCINumericAxis new];
    
    SCDRandomWalkGenerator *randomWalkGenerator = [SCDRandomWalkGenerator new];
    SCDDoubleSeries *data1 = [randomWalkGenerator getRandomWalkSeries:PointsCount];
    [randomWalkGenerator reset];
    SCDDoubleSeries *data2 = [randomWalkGenerator getRandomWalkSeries:PointsCount];
    
    SCIXyDataSeries *ds1 = [[SCIXyDataSeries alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double];
    ds1.seriesName = @"Series #1";
    SCIXyDataSeries *ds2 = [[SCIXyDataSeries alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double];
    ds2.seriesName = @"Series #2";
    
    [ds1 appendValuesX:data1.xValues y:data1.yValues];
    [ds2 appendValuesX:data2.xValues y:data2.yValues];
    
    SCIFastLineRenderableSeries *line1 = [SCIFastLineRenderableSeries new];
    line1.dataSeries = ds1;
    line1.strokeStyle = [[SCISolidPenStyle alloc] initWithColorCode:0xff6495ed thickness:2];
    line1.seriesInfoProvider = [FirstCustomRolloverSeriesInfoProvider new];
    
    SCIFastLineRenderableSeries *line2 = [SCIFastLineRenderableSeries new];
    line2.dataSeries = ds2;
    line2.strokeStyle = [[SCISolidPenStyle alloc] initWithColorCode:0xffe2460c thickness:2];
    line2.seriesInfoProvider = [SecondCustomRolloverSeriesInfoProvider new];
    
    [SCIUpdateSuspender usingWithSuspendable:self.surface withBlock:^{
        [self.surface.xAxes add:xAxis];
        [self.surface.yAxes add:yAxis];
        [self.surface.renderableSeries add:line1];
        [self.surface.renderableSeries add:line2];
        [self.surface.chartModifiers add:[SCIRolloverModifier new]];
        
        [SCIAnimations sweepSeries:line1 duration:3.0 andEasingFunction:[SCICubicEase new]];
        [SCIAnimations sweepSeries:line2 duration:3.0 andEasingFunction:[SCICubicEase new]];
    }];
}

@end

// RolloverCustomizationChartView.swift

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// RolloverCustomizationChartView.swift is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

import SciChart.Protected.SCIDefaultAxisInfoProvider
import SciChart.Protected.SCIAxisTooltip

class RolloverCustomizationChartView: SingleChartLayout {
    
    private class CustomAxisSeriesInfoProvider: SCIDefaultAxisInfoProvider {
        class CustomAxisTooltip: SCIAxisTooltip {            
            override func updateInternal(with axisInfo: SCIAxisInfo!) -> Bool {
                self.text = "Axis ID: \(axisInfo.axisId ?? "") \nValue: \(axisInfo.axisFormattedDataValue?.rawString ?? "")"
                setTooltipBackground(0xff6495ed)
                return true
            }
        }
        
        override func getAxisTooltipInternal(_ axisInfo: SCIAxisInfo!, modifierType: AnyClass!) -> ISCIAxisTooltip! {
            if modifierType == SCIRolloverModifier.self {
                return CustomAxisTooltip(axisInfo: axisInfo)
            } else {
                return super.getAxisTooltipInternal(axisInfo, modifierType: modifierType)
            }
        }
    }
    
    private class FirstCustomSeriesInfoProvider: SCIDefaultXySeriesInfoProvider {
        class FirstCustomXySeriesTooltip: SCIXySeriesTooltip {
            override func internalUpdate(with seriesInfo: SCIXySeriesInfo!) {
                var string = NSString.empty;
                string += "X: \(seriesInfo.formattedXValue.rawString!)\n"
                string += "Y: \(seriesInfo.formattedXValue.rawString!)\n"
                if let seriesName = seriesInfo.seriesName {
                    string += "\(seriesName)\n"
                }
                string += "Rollover Modifier"
                self.text = string;
                
                setTooltipBackground(0xffe2460c);
                setTooltipStroke(0xffff4500);
                setTooltipTextColor(0xffffffff);
            }
            override func onDrawOverlay(in rect: CGRect) {
                self.onDrawTooltipOverlay(in: rect, atCoordinate: self.seriesInfo.xyCoordinate, with: .white)
            }
        }
        
        override func getSeriesTooltipInternal(seriesInfo: SCIXySeriesInfo!, modifierType: AnyClass!) -> ISCISeriesTooltip! {
            if (modifierType == SCIRolloverModifier.self) {
                return FirstCustomXySeriesTooltip(seriesInfo: seriesInfo)
            } else {
                return super.getSeriesTooltipInternal(seriesInfo: seriesInfo, modifierType: modifierType)
            }
        }
    }
    
    private class SecondCustomSeriesInfoProvider: SCIDefaultXySeriesInfoProvider {
        class SecondCustomXySeriesTooltip: SCIXySeriesTooltip {
            override func internalUpdate(with seriesInfo: SCIXySeriesInfo!) {
                var string = "Rollover Modifier\n";
                if let seriesName = seriesInfo.seriesName {
                    string += "\(seriesName)\n"
                }
                string += "X: \(seriesInfo.formattedXValue.rawString!) Y: \(seriesInfo.formattedXValue.rawString!)"
                self.text = string;
                
                setTooltipBackground(0xff6495ed);
                setTooltipStroke(0xff4d81dd);
                setTooltipTextColor(0xffffffff);
            }
        }
        
        override func getSeriesTooltipInternal(seriesInfo: SCIXySeriesInfo!, modifierType: AnyClass!) -> ISCISeriesTooltip! {
            if (modifierType == SCIRolloverModifier.self) {
                return SecondCustomXySeriesTooltip(seriesInfo: seriesInfo)
            } else {
                return super.getSeriesTooltipInternal(seriesInfo: seriesInfo, modifierType: modifierType)
            }
        }
    }

    private let PointsCount = 200
    
    override func initExample() {
        let xAxis = SCINumericAxis()
        xAxis.axisInfoProvider = CustomAxisSeriesInfoProvider()
        let yAxis = SCINumericAxis()
        
        let randomWalkGenerator = SCDRandomWalkGenerator()
        let data1 = randomWalkGenerator.getRandomWalkSeries(PointsCount)
        randomWalkGenerator.reset()
        let data2 = randomWalkGenerator.getRandomWalkSeries(PointsCount)
        
        let ds1 = SCIXyDataSeries(xType: .double, yType: .double)
        ds1.seriesName = "Series #1"
        let ds2 = SCIXyDataSeries(xType: .double, yType: .double)
        ds2.seriesName = "Series #2"
        
        ds1.append(x: data1.xValues, y: data1.yValues)
        ds2.append(x: data2.xValues, y: data2.yValues)
        
        let line1 = SCIFastLineRenderableSeries()
        line1.dataSeries = ds1
        line1.strokeStyle = SCISolidPenStyle(colorCode: 0xff6495ed, thickness: 2)
        line1.seriesInfoProvider = FirstCustomSeriesInfoProvider()
        
        let line2 = SCIFastLineRenderableSeries()
        line2.dataSeries = ds2
        line2.strokeStyle = SCISolidPenStyle(colorCode: 0xffe2460c, thickness: 2)
        line2.seriesInfoProvider = SecondCustomSeriesInfoProvider()
        
        SCIUpdateSuspender.usingWith(surface) {
            self.surface.xAxes.add(xAxis)
            self.surface.yAxes.add(yAxis)
            self.surface.renderableSeries.add(items: line1, line2)
            self.surface.chartModifiers.add(SCIRolloverModifier())
        }
    }
}

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