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macos - SwiftUI on Mac - How do I designate a button as being the primary?

In AppKit I would do this by assigning its key equivalent to be ? or making its cell the window's default. However, neither of these seems possible in SwiftUI, so how do I make a button the default window button?

A Cancel button in the normal grey look, and a Save button in the system accent color. The text "Like this" is inserted with an arrow pointing to the Save button.

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macOS 11.0 / iOS 14:

As of Xcode 12 beta, new methods are exposed on Button() allowing assignment of keyEquivalent (either by enum case or explicit key and modifiers).

Setting as default:

Button( ... )
    .keyboardShortcut(.defaultAction)

Setting as cancel:

Button( ... )
    .keyboardShortcut(.cancelAction)

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