Haptic Feedback Design for Workout Apps

Why Haptics Matter More Than Sound in the Gym When I built BoxTime, I assumed the bell sound would be the primary way users know a round ended. Then I tested it at an actual boxing gym. Between the music, the bag noise, other people training -- you cannot hear your phone. Haptics became the real signal. The Haptic Engine on iOS Apple gives you three levels of haptic control, from simple to granular: UIImpactFeedbackGenerator The simplest option. Predefined impact styles. let impact = UIImpactFeedbackGenerator ( style : . heavy ) impact . prepare () impact . impactOccurred () UINotificationFeedbackGenerator Semantic feedback for success, warning, and error states. let notification = UINotificationFeedbackGenerator () notification . prepare () notification . notificationOccurred ( . success ) Core Haptics (CHHapticEngine) Full control over haptic patterns. This is where it gets interesting for a timer app. import CoreHaptics class HapticManager { private var engine : CHHapticEngine ? fun