Failing cast in Swift from Any? to protocol

Question

FYI: Swift bug raised here: https://bugs.swift.org/browse/SR-3871

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I\'m having an odd problem where a cast isn\'t working, but the console shows it as the corre

Answer 1

The problem is that the sender must pass through the Objective-C world, but Objective-C is unaware of this protocol / struct relationship, since both Swift protocols and Swift structs are invisible to it. Instead of a struct, use a class:

protocol MyProtocol {}
class MyClass: MyProtocol { }
func make() -> MyProtocol { return MyClass() }

Now everything works as you expect, because the sender can live and breathe coherently in the Objective-C world.