I recommend putting this diagram right up front in the KVO/KVC/
Bindings documentation. It took me a long time to get this simple,
clear model into my head.
But also be clear about what the arrows mean: a --> b means that
messages flow from a to b. For KVO the messages flow in response to
observations that go the opposite way (the controller observes the
model) and message passing starts with a change to the model. For KVC
message passing starts with an event from the user. Bindings are made
in the same direction as the messages: views bind to controllers.
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