Compiler error when assigning the Delegate for a Protocol in Swift iOS

Question

I have a problem assigning the delegate for an object that is an instance of a class that defines a protocol in Swift as follows:

I simplified the code to the bare bones

Answer 1

The Known Issues section of the Release Notes says:

You cannot conditionally assign to a property of an optional object. (16922562)

For example, this is not supported:

let window: NSWindow? = NSApplication.sharedApplication.mainWindow
window?.title = "Currently experiencing problems"

So you should do something like if let realObject = object { ... }