问题
I'm following Apple's guidelines for implementing the "Sign in with Apple" button. In the documentation apple says that it is also possible to use only the logo to create a custom button of "Log in with Apple), also you can also change the shape of the image to have a circular button ...
In order to be able to edit the image it also provides insert a mask but I don't understand that we have to create a mask for the button or the selected image.
This is what apple wrote in the documentation
At this point how can I get the sign in button with apple with only the circular logo?
来源：https://stackoverflow.com/questions/60919194/custom-circular-button-for-signin-with-apple