Deleted hideKeyboard method.  ref ViewController.h, ViewController.m
Auto-enabled RETURN key for all text fields & set it to DONE.  ref ViewController.xib
Initialized variables in ViewDidLoad method.
Initialized textFields in same method for dev convenience.  ref ViewController.m
In buttonPressed method: Retrieved maxRounds, prepTime, & roundTime from textFields.  ref ViewController.m
Wrote prepTimeMethod.  ref ViewController.m
Invoked the prepTimer in buttonPressed method.
Added conditional timer invalidation stmt to prepTimeMethod to kill timer at end of countdown.  ref ViewController.m
Added QuartzCore Framework to project.
Implemented sleepTimer method.  ref ViewController.m
Resized View Components.  ref ViewController.xib
Wrote textFieldReturn IBAction & wired all textFields to it via "Did End on Exit".  This hides the keyboard when DONE is pressed.  ref ViewController.h, ViewController.m, ViewController.xib