AnyObjectSwitchTest.swift

import Cocoa

func returnsAString() -> AnyObject? {
    return "I am a String."
}

func returnsAnInt() -> AnyObject? {
    return Int(123)
}

func returnsABool() -> AnyObject? {
    return true
}


func returnsNilBool() -> AnyObject? {
    return nil as Bool?
}

var dict    : [String : AnyObject] = [String : AnyObject]()
var newDict : [String : String   ] = [String : String   ]()

dict["string"] = returnsAString()
dict["int"] = returnsAnInt()
dict["bool"] = returnsABool()
dict["nil"] = returnsNilBool()

for (key, value) in dict {
    switch value {
    case is String:
        newDict[key] = value as! String
    case is Int:
        newDict[key] = String(value as! Int)
    case is Bool:
        newDict[key] = (value as! Bool ? "1" : "0")
    default:
        newDict[key] = String(value)
    }
}

print("Dict: \(dict)")
print("newDict: \(newDict)")