Needing to create a custom calendar

[CrystalBlue]

So, I have a scheduling piece of an application that I need to create. It looks simple to create, but then I get into what I should be doing to create it and I get lost and confused, so maybe someone here could point me in the right direction.

What I am trying to design is a day-to-day planner with events that can be slotted into half-hour slots. The schedule would have blocks of half-hours and you would have event taking up an object between it's start time and end time, with the name and some identification icons in the event object.

Basically, what I think I have to do is create a class for each control that I plan on creating, so I would have one for the overall view, one for a header, one for the schedule area where the times and events could scroll, one for the time block, one for the list of events, and one that would be replicated for each event coming in. Does this seem right? And would I basically be sub-classing UIView to make all of these?