CODEWITHSUNDEEP
iosobjective-cmapbox
Dhaval Golakiya
Dhaval Golakiya

Reputation: 81

Update SymbolLayer iconImageName with zoom level on Mapbox iOS

Platform: iOS

Mapbox SDK version: 4.0.0

How can I update iconImageName in latest version?

In older verson, I was using following code:

symbolLayer.iconImageName = [MGLStyleValue valueWithInterpolationMode:MGLInterpolationModeInterval
      cameraStops:@{
                    @8: [MGLStyleValue valueWithRawValue:imageNameOne],
                    @10: [MGLStyleValue valueWithRawValue:imageNameTwo]                            }
          options: nil];

But in version 4.0.0, I tried with this code:

    NSDictionary *cameraStops = @{
                              @8: [NSExpression expressionWithFormat:imageNameOne],
                              @10: [NSExpression expressionWithFormat:imageNameTwo]
                            };

symbolLayer.iconImageName = [NSExpression expressionWithFormat:@"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'interval', nil, %@)", cameraStops];

But getting error

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid property value: [1][0]: Unknown interpolation type interval'.

Upvotes: 1

Views: 307

Answers (1)

jmkiley
jmkiley

Reputation: 976

The curve type argument for mgl_interpolate:withCurveType:parameters:stops: takes 3 main arguments: linear, exponential, and cubicBezier. Does something like this work?

   NSDictionary *cameraStops = @{
                          @8: imageNameOne,
                          @10: imageNameTwo
                        };
   symbolLayer.iconImageName = [NSExpression expressionWithFormat:@"mgl_step:from:stops:($zoomLevel, nil, %@)", cameraStops];

You may also find this migration guide helpful when updating your code.

Upvotes: 3

Related Questions