If you wish to add tooltips to your iOS Charts, then the SciChart TooltipModifier can add this behavior onto our iOS Chart Control. The SCITooltipModifier is specifically suited for scatter X-Y data, although it may be used for any type of data in SciChart where you want a tooltip to appear on tap-over of a data-point on the chart.

NOTE: See documentation about the SCITooltipModifier Type here.

// TooltipCustomizationChartView.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// TooltipCustomizationChartView.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 "TooltipCustomizationChartView.h"
#import "SCDDataManager.h"
#import "SCDRandomWalkGenerator.h"
#import <SciChart/SCISeriesTooltipBase+Protected.h>
#import <SciChart/SCISeriesInfoProviderBase+Protected.h>

#pragma mark - Cutsom Tooltips

@interface FirstCustomTooltipXySeriesTooltip : SCIXySeriesTooltip
@end
@implementation FirstCustomTooltipXySeriesTooltip
- (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:@"Tooltip Modifier"];
    self.text = string;
    
    [self setTooltipBackground:0xffe2460c];
    [self setTooltipStroke:0xffff4500];
    [self setTooltipTextColor:0xffffffff];
}
@end

@interface SecondCustomTooltipXySeriesTooltip : SCIXySeriesTooltip
@end
@implementation SecondCustomTooltipXySeriesTooltip
- (void)internalUpdateWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo {
    NSString *string = @"Tooltip 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 FirstCustomTooltipSeriesInfoProvider : SCIDefaultXySeriesInfoProvider
@end
@implementation FirstCustomTooltipSeriesInfoProvider
- (id<ISCISeriesTooltip>)getSeriesTooltipInternalWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo modifierType:(Class)modifierType {
    if (modifierType == SCITooltipModifier.class) {
        return [[FirstCustomTooltipXySeriesTooltip alloc] initWithSeriesInfo:seriesInfo];
    } else {
        return [super getSeriesTooltipInternalWithSeriesInfo:seriesInfo modifierType:modifierType];
    }
}
@end
@interface SecondCustomTooltipSeriesInfoProvider : SCIDefaultXySeriesInfoProvider
@end
@implementation SecondCustomTooltipSeriesInfoProvider
- (id<ISCISeriesTooltip>)getSeriesTooltipInternalWithSeriesInfo:(SCIXySeriesInfo *)seriesInfo modifierType:(Class)modifierType {
    if (modifierType == SCITooltipModifier.class) {
        return [[SecondCustomTooltipXySeriesTooltip alloc] initWithSeriesInfo:seriesInfo];
    } else {
        return [super getSeriesTooltipInternalWithSeriesInfo:seriesInfo modifierType:modifierType];
    }
}
@end

static int const PointsCount = 200;

#pragma mark - Chart Initialization

@implementation TooltipCustomizationChartView

- (void)initExample {
    id<ISCIAxis> xAxis = [SCINumericAxis 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 = [FirstCustomTooltipSeriesInfoProvider new];
    
    SCIFastLineRenderableSeries *line2 = [SCIFastLineRenderableSeries new];
    line2.dataSeries = ds2;
    line2.strokeStyle = [[SCISolidPenStyle alloc] initWithColorCode:0xffe2460c thickness:2];
    line2.seriesInfoProvider = [SecondCustomTooltipSeriesInfoProvider 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:[SCITooltipModifier new]];
        
        [SCIAnimations sweepSeries:line1 duration:3.0 andEasingFunction:[SCICubicEase new]];
        [SCIAnimations sweepSeries:line2 duration:3.0 andEasingFunction:[SCICubicEase new]];
    }];
}

@end

// TooltipCustomizationChartView.swift

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// TooltipCustomizationChartView.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.SCISeriesInfoProviderBase
import SciChart.Protected.SCISeriesTooltipBase

class TooltipCustomizationChartView: SingleChartLayout {
    
    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 += "Tooltip Modifier"
                self.text = string;
                
                setTooltipBackground(0xffe2460c);
                setTooltipStroke(0xffff4500);
                setTooltipTextColor(0xffffffff);
            }
        }
        
        override func getSeriesTooltipInternal(seriesInfo: SCIXySeriesInfo!, modifierType: AnyClass!) -> ISCISeriesTooltip! {
            if (modifierType == SCITooltipModifier.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 = "Tooltip 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 == SCITooltipModifier.self) {
                return SecondCustomXySeriesTooltip(seriesInfo: seriesInfo)
            } else {
                return super.getSeriesTooltipInternal(seriesInfo: seriesInfo, modifierType: modifierType)
            }
        }
    }

    private let PointsCount = 200
    
    override func initExample() {
        let xAxis = SCINumericAxis()
        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(SCITooltipModifier())
            
            SCIAnimations.sweep(line1, duration: 3.0, easingFunction: SCICubicEase())
            SCIAnimations.sweep(line2, duration: 3.0, easingFunction: SCICubicEase())
        }
    }
}

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