In SciChart it is possible to link multiple iOS Charts so that they behave as one.

Linked charts zoom together, scroll together, pan together and tooltips interact with all the charts in the shared group.

This technique can be used to create multi-pane stock charts, or an ECG / EKG, or simply link together charts where you wish to see multiple different time-series one above another.

Please read more in SciChart iOS Tutorials:
Tutorial – Linking Multiple Charts

// SCDTwoChartsViewController.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SCDSyncMultipleChartsViewController.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 "SCDTwoChartsViewController.h"

@implementation SCDTwoChartsViewController

- (void)loadView {
    [super loadView];
    
    self.view = [SCIView new];
    self.view.autoresizingMask = SCIAutoresizingFlexible;
    
    SCIView<ISCIChartSurfaceBase> *surface1 = [[self.associatedType alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
    surface1.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:surface1];
    
    SCIView<ISCIChartSurfaceBase> *surface2 = [[self.associatedType alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
    surface2.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:surface2];
    
    [self.view addConstraints:@[
        [surface1.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [surface1.topAnchor constraintEqualToAnchor:self.view.topAnchor],
        [surface1.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        
        [surface1.bottomAnchor constraintEqualToAnchor:surface2.topAnchor],
        [surface1.heightAnchor constraintEqualToAnchor:surface2.heightAnchor],
        
        [surface2.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [surface2.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [surface2.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor]
    ]];
    
    _surface1 = surface1;
    _surface2 = surface2;
}

- (void)tryUpdateChartTheme:(SCIChartTheme)theme {
    [SCIThemeManager applyTheme:theme toThemeable:self.surface1];
    [SCIThemeManager applyTheme:theme toThemeable:self.surface2];
}

@end

// SyncMultipleChartsView.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SyncMultipleChartsView.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 "SyncMultipleChartsView.h"
#import "SCDDataManager.h"

static int const PointsCount = 500;

@implementation SyncMultipleChartsView {
    SCIDoubleRange *_sharedXRange;
    SCIDoubleRange *_sharedYRange;
}

- (Class)associatedType { return SCIChartSurface.class; }

- (BOOL)showDefaultModifiersInToolbar { return NO; }

- (void)initExample {
    _sharedXRange = [[SCIDoubleRange alloc] initWithMin:0 max:1];
    _sharedYRange = [[SCIDoubleRange alloc] initWithMin:0 max:1];
    
    [self initChart:self.surface1];
    [self initChart:self.surface2];
}

- (void)initChart:(SCIChartSurface *)surface {
    id<ISCIAxis> xAxis = [SCINumericAxis new];
    xAxis.growBy = [[SCIDoubleRange alloc] initWithMin:0.1 max:0.1];
    xAxis.visibleRange = _sharedXRange;
    
    id<ISCIAxis> yAxis = [SCINumericAxis new];
    yAxis.growBy = [[SCIDoubleRange alloc] initWithMin:0.1 max:0.1];
    yAxis.visibleRange = _sharedYRange;
    
    SCIXyDataSeries *dataSeries = [[SCIXyDataSeries alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double];
    for (int i = 0; i < PointsCount; i++) {
        [dataSeries appendX:@(i) y:@(PointsCount * sin(i * M_PI * 0.1) / i)];
    }
    
    SCIFastLineRenderableSeries *rSeries = [SCIFastLineRenderableSeries new];
    rSeries.dataSeries = dataSeries;
    rSeries.strokeStyle = [[SCISolidPenStyle alloc] initWithColorCode:0xFF68bcae thickness:1.0];
    
    SCIRolloverModifier *rolloverModifier = [SCIRolloverModifier new];
    rolloverModifier.receiveHandledEvents = YES;
    rolloverModifier.eventsGroupTag = @"SharedEventGroup";
    
    [SCIUpdateSuspender usingWithSuspendable:surface withBlock:^{
        [surface.xAxes add:xAxis];
        [surface.yAxes add:yAxis];
        [surface.renderableSeries add:rSeries];
        [surface.chartModifiers addAll:[SCIZoomExtentsModifier new], [SCIPinchZoomModifier new], rolloverModifier, [SCIXAxisDragModifier new], [SCIYAxisDragModifier new], nil];
        
        [surface zoomExtents];
        [SCIAnimations sweepSeries:rSeries duration:3.0 andEasingFunction:[SCICubicEase new]];
    }];
}

@end

// SyncMultipleChartsView.swift

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

class SyncMultipleChartsView: SCDTwoChartsViewController<SCIChartSurface> {
    
    override var associatedType: AnyClass { return SCIChartSurface.self }
    
    let PointsCount = 500
    let SharedXRange = SCIDoubleRange(min: 0, max: 1)
    let SharedYRange = SCIDoubleRange(min: 0, max: 1)
    
    override var showDefaultModifiersInToolbar: Bool { return false }
    
    override func initExample() {
        initChart(surface: surface1!)
        initChart(surface: surface2!)
    }

    fileprivate func initChart(surface: SCIChartSurface) {
        let xAxis = SCINumericAxis()
        xAxis.growBy = SCIDoubleRange(min: 0.1, max: 0.1)
        xAxis.visibleRange = SharedXRange
        
        let yAxis = SCINumericAxis()
        yAxis.growBy = SCIDoubleRange(min: 0.1, max: 0.1)
        yAxis.visibleRange = SharedYRange
        
        let dataSeries = SCIXyDataSeries(xType: .double, yType: .double)
        for i in 0 ..< PointsCount {
            dataSeries.append(x: i, y: Double(PointsCount) * sin(Double(i) * .pi * 0.1) / Double(i))
        }
        
        let rSeries = SCIFastLineRenderableSeries()
        rSeries.dataSeries = dataSeries
        rSeries.strokeStyle = SCISolidPenStyle(color: 0xFF68bcae, thickness: 1.0)

        let rolloverModifier = SCIRolloverModifier()
        rolloverModifier.receiveHandledEvents = true
        rolloverModifier.eventsGroupTag = "SharedEventGroup"
        
        SCIUpdateSuspender.usingWith(surface) {
            surface.xAxes.add(xAxis)
            surface.yAxes.add(yAxis)
            surface.renderableSeries.add(rSeries)
            surface.chartModifiers.add(items: SCIZoomExtentsModifier(), SCIPinchZoomModifier(), rolloverModifier, SCIXAxisDragModifier(), SCIYAxisDragModifier())
            
            surface.zoomExtents()
            SCIAnimations.sweep(rSeries, duration: 3.0, easingFunction: SCICubicEase())
        }
    }
}

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