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Is it possible to label a layer using same colors as the categorized symbology of that layer?

It is possible using the Rule-based labeling, but it can be difficult for a layer with many categories and maybe it can be done using the Data-defined override, but I don't know how to get the color used for every category.

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Using QGIS 3.4.5, you can write @symbol_color in the data defined override for coloring the text:

  1. Go to Data defined override -> Edit

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  1. Write the following:

@symbol_color

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  1. Use buffer around the text to see the label
  2. Output:

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For multi-layer symbol, note that @symbol_color returns the color of the last symbol layer (the one on the bottom, be it visible or not) ex of multi-layr symbol

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I can report that this feature does not work if the labeled layer uses geometry generators – the color reverts to black. Seems to be a bug. symbol color reverts to black on layer with geometry generator

There is a workaround for this (put a standard symbol in, disable visibility, move it to the bottom of the symbology list - @symbol_color will always pick up the colour of the bottom-most symbol.)

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  • 4
    If you discover a bug, please report it directly on github.com/qgis/QGIS/issues
    – MrXsquared
    Apr 30, 2020 at 15:52
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    Please raise this as a separate issue or comment. Your answer will likely be deleted but i have a workaround for this (put a standard symbol in, disable visibility, move it to the bottom of the symbology list - @symbol_color will always pick up the colour of the bottom-most symbol.)
    – she_weeds
    May 1, 2020 at 11:57
  • Nice trick @she_weeds, i confirm your workaround does the job ...
    – Snaileater
    May 18, 2020 at 14:21
  • @she_weeds, thank you for the trick, it saves my day.
    – kFly
    May 7, 2022 at 8:02

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