Just an example, Apple's Mail, Notes and Messages use the same image for their "Edit" button. However, I cannot find that image in any of the resources folder in their app bundles. I guess the image might be in a system folder that is used by these applications. There are many "common used images" like this one that are not in Xcode's media library. Since they are already familiar to the users, it makes sense to use the same image set in my own app.
My question is, where can I find those images? A side question, is it legal to use them?
