Zombie banana uprising

zombie-banana.swift

class Banana: NSObject, NSSecureCoding {
    let bananaName: String
    let userInfo: [String: Any]
    
    static var supportsSecureCoding: Bool = true
    
    init(bananaName: String, userInfo: [String: Any]) {
        self.bananaName = bananaName
        self.userInfo = userInfo
    }
    
    required init?(coder: NSCoder) {
        guard
            let bananaName = coder.decodeObject(of: NSString.self, forKey: "bananaName") as String?,
            let userInfo = coder.decodeObject(of: NSDictionary.self, forKey: "userInfo") as? [String: Any]
        else {
            return nil
        }
        
        self.bananaName = bananaName
        self.userInfo = userInfo
    }
    
    func encode(with coder: NSCoder) {
        coder.encode(self.bananaName, forKey: "bananaName")
        coder.encode(self.userInfo, forKey: "userInfo")
    }
}

func testing() {
    let subordinateBananas: [Banana] = [Banana(bananaName: "Douglas", userInfo: [:]), Banana(bananaName: "Phil", userInfo: [:])]
    let leadBanana = Banana(bananaName: "Penny", userInfo: ["subordinates": subordinateBananas])
    let toEncode: [String: Any] = ["lead": leadBanana]
    let encodedData = try! NSKeyedArchiver.archivedData(withRootObject: toEncode, requiringSecureCoding: true)
    
    // ❌ CRASH 💥
    let resurrectedBananaSquad = try! NSKeyedUnarchiver.unarchivedObject(ofClasses: [NSDictionary.self, NSArray.self, Banana.self], from: encodedData)
    
    print("🍌🧟‍♂️🍌 \(String(describing: resurrectedBananaSquad))")
}

The problem is with

let userInfo = coder.decodeObject(of: NSDictionary.self, forKey: "userInfo")

You need

let userInfo = coder.decodeObject(of: [NSDictionary.self, NSArray.self, Banana.self], forKey: "userInfo")

@KhaosT is spot on, for this Gist you also need to keep the cast:

let userInfo = coder.decodeObject(of: [NSDictionary.self, NSArray.self, Banana.self], forKey: "userInfo") as? [String: Any]

Y'all the best