CODEWITHSUNDEEP
swifttuples
kye
kye

Reputation: 2246

Return an array of tuples as AnyObject?

Is it possible to return an array of tuples as AnyObject? or would I have to encapsulate the tuple variable within a class then return that class?

Current structure

public typealias Changes = (id:Int!, cors:Bool!)

 struct ClientReturn{
    var error: NSError?
    var json: JSON?
    var mutableReturn: AnyObject?
    var pageResults: PageResults?
}

class func Changes(api_key: String!, startDate: String?, endDate:String?,
    completion: (ClientReturn) -> ()) -> (){
    //content
}

Client.Changes(api_key, startDate: nil, endDate: nil){
    apiReturn in
    var aReturn = apiReturn;
    var changesArray = [Changes]()
    for(var i = 0; i < apiReturn.json!["results"].count; i++ ){
        let json = apiReturn.json!["results"]
        changesArray.append((id: json[i]["id"].int, cors: json[i]["cors"].bool))
    }
    //aReturn.mutableReturn = changesArray as! Changes
    aReturn.mutableReturn = changesArray //ERROR (Cannot assign value of type '[Changes]' to type 'AnyObject?')
    completionHandler(aReturn)
}

Upvotes: 1

Views: 203

Answers (1)

matt
matt

Reputation: 534966

The only thing that can be cast up to AnyObject is a class (or a Swift struct that is bridged to some class).

A tuple is not a class. Thus, it cannot be cast up to an AnyObject.

The same thing applies to an array, though by a more roundabout route. An Array is not a class, but it is bridged to NSArray. But an NSArray can contain only classes, i.e. AnyObject elements. Thus, only an array of AnyObject-castables can be cast to AnyObject. A tuple is not a class... You take it from here.

Another way of looking at it is this: AnyObject is all about interchange with Objective-C. But tuples are a Swift-only feature: Objective-C knows nothing of them. Thus, an array of tuples cannot be cast to an AnyObject, because it cannot be handed to Objective-C.

Upvotes: 6

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