Edit the background color to be transparent, load it into a bitmap in the program, and use CoreGraphics, shader and blending mode to draw a dark outline
Offset a few pixels and draw the original bitmap again
But this doesn’t make any sense in terms of engineering, it’s just “can do”
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Does it have to be implemented in code? You can consider asking an artist to produce a picture
ios--UIImageView adds borders and shadows
http://www.aichengxu.com/view/32652
Add a layer to redraw the five-pointed star
Edit the background color to be transparent, load it into a bitmap in the program, and use CoreGraphics, shader and blending mode to draw a dark outline
Offset a few pixels and draw the original bitmap again
But this doesn’t make any sense in terms of engineering, it’s just “can do”