A few weeks ago Graham was asking how to make instances of his NSView subclass
redraw themselves automatically when their custom properties were changed.
During the discussion he said something like “wouldn’t it be great if you could
declare a property as “(redraw)” and then it would automatically redraw the
view when it changed.” Which got shot down (rightly IMHO) for hardcoding
AppKit/UIKit-specific behavior into the language.
But now there’s a new Swift language proposal to add a general-purpose
extensible “behaviors” mechanism to properties. It would let Graham do pretty
much exactly what he described — someone would just have to write a snippet of
Swift code to implement the “redraw” behavior, which could be done either in
the app or in the UI framework itself.
Take a look, it’s a pretty cool proposal. Joe Groff gives examples of how it
can be used to implement existing Swift (and Obj-C) property behaviors like
atomic, lazy, and copying.
https://github.com/apple/swift-evolution/blob/master/proposals/0030-property-behavior-decls.md
(Discussion should happen on the swift-evolution mailing list, not here, unless
it’s something specific to a “redraw” behavior.
https://lists.swift.org/mailman/listinfo/swift-evolution
<https://lists.swift.org/mailman/listinfo/swift-evolution> )
—Jens
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