I have edited some NSButtons in my Mac OS X application and set a custom image to them. The images are in png format with transparency. When I select a button, the background of the image goes white.
Does anyone know of a way to fix this?
The issue was that I was customising a 'Bevel' button. I changed the button bezel to 'Square' and changed the button type to 'Momentary Change'.
Hope this helps some people in the future!
来源：https://stackoverflow.com/questions/4801418/nsbuttons-images-lose-transparency-on-selection