{"id":45269,"date":"2024-10-07T13:27:33","date_gmt":"2024-10-07T17:27:33","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=45269"},"modified":"2024-10-07T13:27:33","modified_gmt":"2024-10-07T17:27:33","slug":"dealing-with-objective-c-protocol-types-in-swift","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2024\/10\/07\/dealing-with-objective-c-protocol-types-in-swift\/","title":{"rendered":"Dealing With Objective-C Protocol Types in Swift"},"content":{"rendered":"

Dave Rahardja<\/a>:<\/p>\n

\n

There are two ways to refer to this protocol in Swift: using a native Swift type, or using an Objective-C Protocol<\/code> object reference.<\/p>\n

let fungibleSwiftProtocol = Fungible.self\nlet fungibleObjCProtocol = NSProtocolFromString(\"Fungible\")!\n<\/pre>\n
These two types should<\/em> be the same—after all, they refer to the same protocol—but they are not<\/em>, as shown when we print out their descriptions and ObjectIdentifier<\/code>s[…]<\/p>\n
[…]<\/p>\n
The answer is yes<\/em>: there is a way to convert a Swift type that refers to an Objective-C protocol into an Objective-C Protocol<\/code> reference.<\/p>\n
[…]<\/p>\n
fungibleSwiftProtocol as AnyObject as? Protocol<\/pre>\n<\/blockquote>\n
There is apparently no way to convert in the other direction.<\/p>\n\n
Previously:<\/p>\n