Swift 3 ObjC Optional Protocol Method Not Called in Subclass

Question

I have the following class hierarchy:

class ScrollableViewController: UIViewController, UITableViewDelegate { // ... }

That implements one

Answer 1

This appears to be fixed in Swift 3.0.1 for normal subclasses, but is not fixed for generic subclasses:

class A: NSObject, UITableViewDelegate {}

class B: A {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {}
}

class C: A {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {}
}

print(#selector(B.tableView(_:didSelectRowAt:))) // tableView:didSelectRowAtIndexPath:
print(#selector(C.tableView(_:didSelectRowAt:))) // tableView:didSelectRowAt:

See: https://bugs.swift.org/browse/SR-2817

To fix it: https://stackoverflow.com/a/39416386/1109892

@objc(tableView:heightForRowAtIndexPath:)
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
  // return stuff
}