iOS & macOS Charting Documentation - SciChart iOS & macOS Charts SDK v4.x

SCIRolloverModifier

The SCIRolloverModifier can be used to show tooltips for all the series under the vertical line drawn at the touch position:

NOTE: The SCIRolloverModifier is specifically suited to inspect data across many series are the same. For scatter charts, or irregular charts, please try the SCITooltipModifier.

Rollover Modifier

NOTE: Examples of the SCIRolloverModifier usage can be found in the SciChart iOS Examples Suite as well as on GitHub:

Obj-C/Swift Example

Xamarin Example

SCIRolloverModifier Features

Besides the SCIRolloverModifier specific features, there are some common features which are shared between SCITooltipModifier, SCIRolloverModifier and SCICursorModifier via common SCITooltipModifierBase class.

Common Features

Feature	Description
`SCITooltipModifierBase.showTooltip`	Allows to hide or show modifier’s Tooltips.
`SCITooltipModifierBase.useInterpolation`	Allows to show interpolated values between data points. It is set to `YES` by default. If `NO` - modifier’s Tooltips will report the info about closest data points.
`SCITooltipModifierBase.sourceMode`	Allows to specify which `ISCIRenderableSeries` are to be inspected by a modifier, e.g. Visible, Selected, etc. Other will be ignored by the modifier. Expects a member of the `SCISourceMode` enumeration.

Specific Features

Feature	Description
`SCITooltipModifierWithAxisLabelsBase.showAxisLabel`	Allows to hide or show Rollover’s axis label
`SCIRolloverModifier.drawVerticalLine`	Allows to hide or show Rollover’s vertical line.
`SCIRolloverModifier.verticalLineStyle`	Allows to specify `SCIPenStyle` which will be used to draw rollover vertical line

Adding a SCIRolloverModifier to a Chart

Any Chart Modifier can be added to a SCIChartSurface via the ISCIChartSurface.chartModifiers property and SCIRolloverModifier with no difference:

// Assume a surface has been created and configured somewhere
id<ISCIChartSurface> surface;
// Create a Modifier and add modifier to the surface
[self.surface.chartModifiers add:[SCIRolloverModifier new]];

// Assume a surface has been created and configured somewhere
let surface: ISCIChartSurface
// Create a Modifier and add modifier to the surface
self.surface.chartModifiers.add(SCIRolloverModifier())

// Assume a surface has been created and configured somewhere
IISCIChartSurface surface;
// Create a Modifier and add modifier to the surface
Surface.ChartModifiers.Add(new SCIRolloverModifier());

NOTE: To learn more about features available, please visit the Chart Modifier APIs article.