System events

Overview

Specify view and scene modifiers to indicate how your app responds to certain system events. For example, you can use the onOpenURL(perform:) view modifier to define an action to take when your app receives a universal link, or use the backgroundTask(_:action:) scene modifier to specify an asynchronous task to carry out in response to a background task event, like the completion of a background URL session.

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Topics

Sending and receiving user activities

• Restoring your app’s state with SwiftUI
• userActivity(_:element:_:)
• userActivity(_:isActive:_:)
• onContinueUserActivity(_:perform:)

Sending and receiving URLs

• openURL
• OpenURLAction
• onOpenURL(perform:)

Handling external events

• handlesExternalEvents(matching:)
• handlesExternalEvents(preferring:allowing:)

Handling background tasks

• backgroundTask(_:action:)
• BackgroundTask
• SnapshotData
• SnapshotResponse

Importing and exporting transferable items

• importableFromServices(for:action:)
• exportableToServices(_:)
• exportableToServices(_:onEdit:)

Importing and exporting using item providers

• importsItemProviders(_:onImport:)
• exportsItemProviders(_:onExport:)
• exportsItemProviders(_:onExport:onEdit:)

See Also

Event handling

• Gestures
• Input events
• Clipboard
• Drag and drop
• Focus