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# MKGradientPolylineRenderer

A visual representation of any polyline overlay object with a gradient.

```
class MKGradientPolylineRenderer
```

## Overview

This renderer only applies a stroke to the line; it doesn’t fill it. Set the gradients with [`setColors:atLocations:`](/documentation/MapKit/MKGradientPolylineRenderer/setColors:atLocations:) and pair colors to locations that MapKit represents as unit distance values along the distance of the polyline. Don’t subclass `MKGradientPolylineRenderer`. Use the class as-is.

The gradient displays itself along the direction of the line.

## Topics

### Accessing the gradient colors

[`setColors(_:locations:)`](/documentation/MapKit/MKGradientPolylineRenderer/setColors(_:locations:)-3xrou)

Sets the iOS colors and corresponding unit distance values to create gradients.

[`setColors(_:locations:)`](/documentation/MapKit/MKGradientPolylineRenderer/setColors(_:locations:)-1tuft)

Sets the macOS colors and corresponding unit distance values to create gradients.

[`setColors:atLocations:`](/documentation/MapKit/MKGradientPolylineRenderer/setColors:atLocations:)

Sets the colors and corresponding unit distance values to create gradients.

[`colors`](/documentation/MapKit/MKGradientPolylineRenderer/colors)

An array that represents the gradient’s color transition points.

[`locations`](/documentation/MapKit/MKGradientPolylineRenderer/locations-7k6qz)

An array of location indexes that correspond to their respective colors.

[`locations`](/documentation/MapKit/MKGradientPolylineRenderer/locations-50knt)

An array of location indices corresponding to their respective colors.


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