Beginning App Asset Design - Part 4: Composing Shapes | Ray Wenderlich

Use simple shapes and boolean operations to design a tab bar icon. Build up your own symbol library.

This is a companion discussion topic for the original entry at

At the end of this video, @catie said:

Know that the order of the layers matches the order of the overrides, The symbol naming scheme that organizes your symbols in the Insert menu is also how you control which symbols can be used as overrides

I think this explanation seems too simple and I can’t really understand what your mean, So Could you give me more detail?

@catie Can you please help with this when you get a chance? Thank you - much appreciated! :]