Swift 2: How can i assign a dictionary to AnyObject? - swift

Question

I was using swift 1.2 and everything was going fine. after upgrading my Xcode to 7 . I faced some weird problems.
My code was :
let postData : AnyObject = ["username":username , "password":password] ;
I need this variable to be AnyObject, because
let jsonObject : AnyObject = postData ;
let jsonString = JSONStringify(jsonObject)
let data1 = jsonString.dataUsingEncoding(NSUTF8StringEncoding)
let task1 = NSURLSession.sharedSession().uploadTaskWithRequest(request, fromData: data1) {
(Data, Response, Error) -> Void in
needs a Anyobject for post Data header.
The error is
Value of type '[String : String?]' does not conform to specified type 'AnyObject'
can any one help me?

Answer 1

The problem is your password variable is an Optional<String>. This means the conversion from Swift dictionary to AnyObject (I think it tries to convert it to an NSDictionary) will fail.
If you do
let postData : AnyObject = ["username":username , "password":password!]
It should work unless the password is nil (check that before creating the dictionary)
If you want to be able to have null passwords in the output, you can do this in your dictionary
let postData : [String : AnyObject] = ["username":username , "password":password ?? NSNull()]
The following works
let pw: String? = "pw"
let pw2: String? = nil
var foo: [String : AnyObject] = ["bar" : pw ?? NSNull(), "baz" : pw2 ?? NSNull()]
let data = try NSJSONSerialization.dataWithJSONObject(foo, options: NSJSONWritingOptions.PrettyPrinted)
let str = NSString(data: data, encoding: NSUTF8StringEncoding)!
print(str)
And prints
{
"baz" : null,
"bar" : "pw"
}

Answer 2

I assume you are passing parameters to a request which require key as String and value can be AnyObject. Try this:
let postData: [String: AnyObject] = ["username":username , "password":password]
Also make sure username and password are not optional, and in that case, use ! to unwrap them if you are sure values wil be there.
let postData: [String: AnyObject] = ["username":username!, "password":password!]
or you can use
let postData: [String: AnyObject] = ["username":username ?? "", "password":password ?? ""]