NSScrollView

Primarily this is used by me to load an image file into a custom view in a particular window. The relationship/order of objects is:

for illustration purposes, a custom view will be added to a window in IB
NSView will be subclassed to MyView, and the custom view will use the custom class, MyView
with MyView selected in IB, Layout → Make subviews of → Scroll View
MyView is now the documentView of NSClipView and NSScrollView
NSClipView is the contentView of NSScrollView
to manually scroll, modify the bounds origin of the NSClipView