Let's see if there is a problem? Where is the problem? Can you point it out?

[junmaqiang]

is this demo code

package main

import (
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
)

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("ico.demo")
	// 
	loadingSvgToContent := `<?xml version="1.0" encoding="UTF-8"?>
<svg width="24" height="24" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M4 24C4 35.0457 12.9543 44 24 44V44C35.0457 44 44 35.0457 44 24C44 12.9543 35.0457 4 24 4" stroke="#333" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M36 24C36 17.3726 30.6274 12 24 12C17.3726 12 12 17.3726 12 24C12 30.6274 17.3726 36 24 36V36" stroke="#333" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
</svg>`
	loadingSvgResource := fyne.NewStaticResource("loading.svg", []byte(loadingSvgToContent))
	//
	a := widget.NewButtonWithIcon("loadingSvgResource", loadingSvgResource, nil)
	//
	b := widget.NewButtonWithIcon("NewThemedResource", theme.NewThemedResource(loadingSvgResource), nil)
	c := widget.NewButtonWithIcon("NewDisabledResource", theme.NewDisabledResource(loadingSvgResource), nil)
	d := widget.NewButtonWithIcon("NewErrorThemedResource", theme.NewErrorThemedResource(loadingSvgResource), nil)
	e := widget.NewButtonWithIcon("NewInvertedThemedResource", theme.NewInvertedThemedResource(loadingSvgResource), nil)
	f := widget.NewButtonWithIcon("NewPrimaryThemedResource", theme.NewPrimaryThemedResource(loadingSvgResource), nil)
	//
	layoutA := container.NewHBox(a)
	layoutB := container.NewHBox(b, c, d, e, f)
	layout := container.NewVBox(layoutA, layoutB)
	myWindow.SetContent(layout)
	myWindow.Resize(fyne.NewSize(800, 300))
	myWindow.ShowAndRun()
}

is this demo

is this svg

[junmaqiang]

I feel that there is always a problem with the color, it seems to be caused by color superposition

[andydotxyz]

I cannot see an error in the code demonstrated above. You will need to present a more specific question so we can understand what you think the issue is...

Oh maybe I do - are you trying to report that colourising seems to fill part of your icon?

[junmaqiang]

yes, that colourising seems to fill part of your icon

[andydotxyz]

Thanks. Opening an issue would be the right thing to do. Discussions are not the place for bug reports.