Tuesday, October 31, 2017 [Tweets] [Favorites]

Selective Selector Mapping

Daniel Jalkut:

It turns that adding that protocol conformance onto my class declaration not only gains me Swift’s protocol type checking, but changes the way key functions are mapped from Swift to Objective-C:

class MyDataSource: NSObject, NSTableViewDataSource {
    func numberOfRows(in tableView: NSTableView) -> Int {
        return 0
    }
}

let thisSource = MyDataSource()
thisSource.responds(to: Selector("numberOfRowsInTableView:")) // true

Armed with the knowledge that my class intends to comply with NSTableViewDataSource, Swift generates the expected mapping to Objective-C.

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