Monitor the Current Location’s Distance from the Destination
In other books and in my classes, I show developers how to add a fun feature to the RoadTrip app. When the user shakes the device, a semitransparent window drops down from the top of the screen and displays the distance for either a found location or the final destination. You add this feature by using the accelerometer and core location frameworks.
If the user finds this feature annoying — and because this added feature can chew up the battery life — you want to offer the user the option to toggle it on and off. See the earlier section, “Add Preferences.”
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