CODEWITHSUNDEEP
swiftcastingsprite-kitplistxcode6.3
James Stephen Brown
James Stephen Brown

Reputation: 299

New warning in Xcode 6.3 & Swift 1.2: Cast from '[SKNode]' to unrelated type 'String' always fails

After updating to xCode 6.3 / Swift 1.2 I have run into an error I can't resolve: "Cast from '[SKNode]' to unrelated type 'String' always fails".

Below is my GameScene code which begins by parsing a p-list.

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate, NSXMLParserDelegate {

    var currentTMXFile:String?

    override func didMoveToView(view: SKView) {

        /* Parse p-list */

        let path = NSBundle.mainBundle().pathForResource("GameData", ofType: "plist")
        let dict = NSDictionary(contentsOfFile: path!)!
        let playerDict:AnyObject = dict.objectForKey("PlayerSettings")!
        let gameDict:AnyObject = dict.objectForKey("GameSettings")!
        let levelArray:AnyObject = dict.objectForKey("LevelSettings")!

        if let levelNSArray:NSArray = levelArray as? NSArray {

            var levelDict:AnyObject = levelNSArray[level]

            numberOfLevels = levelNSArray.count

            if let tmxFile = levelDict["TMXFile"] as? String {

                currentTMXFile = tmxFile

            }

        }

The error is being thrown up at...

if let tmxFile = levelDict["TMXFile"] as? String {...

and is returning a nil value, even though there is a string value in the p-list and prior to updating, it was working fine. I have tried casting as AnyObject first and this throws up more errors.

Upvotes: 3

Views: 4375

Answers (2)

snibbe
snibbe

Reputation: 2738

If you happen to be doing this with the dynamicType of an object in a case statement, here's how:

     switch (self.dynamicType) {
        case is MyClass.Type:
            print("MyClass")
            break;
     }

Upvotes: 1

Antonio
Antonio

Reputation: 72790

Here:

var levelDict:AnyObject = levelNSArray[level]

you are declaring levelDict as AnyObject, but here:

if let tmxFile = levelDict["TMXFile"] as? String {

you are using it as if it were a dictionary - I wonder how it's possible that it worked in a previous version of Xcode...

However, to fix it, make that variable an explicit dictionary, either a cocoa one:

var levelDict = levelNSArray[level] as? NSDictionary

if let tmxFile = levelDict?.objectForKey("TMXFile") as? String {

or a swift one:

var levelDict = levelNSArray[level] as? [String : AnyObject]

if let tmxFile = levelDict?["TMXFile"] as? String {

Upvotes: 4

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