App Exercise $-$ Heart Rate Delegate

These exercises reinforce Swift concepts in the context of a fitness tracking app.

Your fitness tracking app will likely have a class dedicated to receiving information from the fitness tracking hardware. The HeartRateReceiver class below represents a very simplified example of what this may look like with monitoring heart rate. The function startHeartRateMonitoringExample will generate random heart rates and assign them to currentHR, simulating how an instance of HeartRateReceiver may pick up on new heart rate readings at specific intervals.

HeartRateViewController below is a view controller that will present the heart rate information to the user. Throughout the exercises below you'll use the delegate pattern to pass information from an instance of HeartRateReceiver to the view controller so that anytime new information is obtained it is presented to the user.