SwiftUI on watchOS

watchOS 6

• Independent watchOS apps (decoupled from iOS apps)

• Extended run-time sessions

• Building experiences: Complications, Notifications, Siri, etc.

• Prioritize quick interactions

Full Power of SwiftUI

• Declarative syntax Whole new UI framework, new fetures and APIs

• Integration Watchkit controllers with SwiftUI Views

  • InterfaceController inherits WKHostingController

• Lists WatchOS flash cards app

• Keep model and List in sync using @ObservedObject

• Use Command + Click to bring up the inspector and use different contextual options while coding

• Use .listStyle(.carousel) to get the carousel effect while scrolling the list

• Swipe to delete, drag to reorder

• Use .onMove and .onDelete blocks to manage the movement and deletion of items in the list

• Interactive Notifications Timely and contextual info

  • Short look (Info from payload + App icon) Immediately upon wrist raise

• Long look (Scrolling interface with custom body and action buttons)

• NotificationController inherits WKUserNotificationHostingController

  • didReceive method allows us to extract info from notification

  • body property is re-evaluated after didReceive is called

• Digital Crown Series 4 watch can make use of haptic crown (e.g. workout app, custom timer)

  • Building following custom interfaces requires .digitalCrowRotation and .focusable modifier

  • Free scrolling interface (no concrete spots between elements)

  • binding (source of truth)

  • from

  • through

• Picking between discrete elements

  • binding (source of truth)

  • from

  • through

  • by (stride along which haptic feedback is provided)

• Moving around circles (not limited to either end of the sequence)

  • binding (source of truth)

  • from

  • through

  • by (stride along which haptic feedback is provided)

  • sensitivity (how much rotation need to be applied to move from one element to the next)

  • isContinuous (don’t stop at either limit of sequence)