Open Radar

 
Swift has an awesome feature that calling Class.myMethodName will return a block that takes an instance that returns a block that calls the method on the instance. This makes for some really clean code that avoids using selectors/strings that could be applied to any class.

It would be nice if this same principal was applied to properties as well. ObjC uses keys and key paths all over the place, but those break as code is refactored without any compiler warning.

Something that worked similar to the following:

Conversation.subject // returns a meta object
Conversation.subject.key // “subject”
Conversation.subject.getter // (Conversation) -> (() -> (String))
Conversation.subject.setter // (Conversation) -> ((String) -> ())

Bonus points for a clean way to replace KVO (that doesn’t crash all the time).

Conversation.subject.addObserver(aConversation, options: nil) {
	// do something when it changes
} // returns an observer meta object that can be used to remove it, i.e. observer.remove()