How to pass Swift array as parameter to thread?

chapka

I'm trying to spawn a new thread to perform some background processing based on a String that has been decomposed into an array of characters. Here is what my code looks like:

   var testString : String = NSString(data:data!, encoding:NSUTF8StringEncoding)
   var testStringArray : Array<Character> = []

   for character in testString
   {
       if(!(self.isCharacterStrippable(character)))
       {
           testStringArray.append(character)
       }
   }

   NSThread.detachNewThreadSelector("fillKeysFromArray:", toTarget: self, withObject: testStringArray)

I get a compiler error telling me "Array does not conform to protocol AnyObject".

Without writing an object wrapper for the array, or making it an instance variable (both seem like overkill), is there any way I can make this array pass to a new thread?

Mike S

Using Grand Central Dispatch will be much easier in the long run . You can run a function on a background thread using:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
    [weak self] in // This is so that we don't create a reference cycle
    self?.fillKeysFromArray(testStringArray);
    return
}

You can read about Grand Central Dispatch and all the features it offers in terms of threads and concurrency in Apple's Concurrency Programming Guide .

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