It should be a filling pattern! If yes, please look at the following example:

First, create a new 4*4 canvas (the specific size depends on the pattern, in fact, this shading is to repeat this filling pattern and try it several times), create a new layer, draw two single-pixel vertical lines on it (draw a line every other pixel), then hide the white background, and click the menu to edit-> Define the mode and then close the document.

Open your document, bring up the selection of shading, and then click Edit-> Fill, select the pattern in the options, then select the pattern you just defined, and then the pattern is paved, which is a row of vertical shading.

There are many png modes on the Internet. Direct download, defined in ps for direct use!