This is an extremely basic demonstration of instanced drawing, including how to animate instances and how to use vertex descriptors in concert with instancing to automatically fetch per-instance data in the vertex shader.
In Bridging-Header.h, set USE_VERTEX_DESCRIPTOR to 1 or 0, to enable or disable vertex descriptors respectively.
Build and run
Xcode 11 or newer
macOS 10.15 Catalina or newer