IOS Multiple save parsing objects with progress bar

Question

IOS Multiple save parsing objects with progress bar

I found this very interesting approach ( Parse: is it possible to track the progress of the PFObject download ) and I tried to convert the objective-c category to a quick extension, But I am haunted by type values unsigned long.
Please review the following code - it throws an exception (line:) let progress:Int32 = Int32(100*count/numberOfCyclesRequired): fatal error: floating-point value could not be converted to Int32, because it is either infinite or NaN. I'm also not sure how to handle the prefix __blockin swift so that counter changes also come from the block.

extension PFObject {

class func saveAllInBackground(objects: [AnyObject]!, chunkSize:Int, block: PFBooleanResultBlock!, progressBlock:PFProgressBlock) {

    let numberOfCyclesRequired:Double = Double(objects.count / chunkSize)
    var count:Double = 0
    PFObject.saveAllInBackground(objects, chunkSize: chunkSize, block: block) { (trig:Bool) -> Void in
        count++
        let progress:Int32 = Int32(100*count/numberOfCyclesRequired)
        progressBlock(progress)
    }
}

class func saveAllInBackground(objects: [AnyObject]!, chunkSize:Int, block: PFBooleanResultBlock!, trigger:(Bool) -> Void) {
    let range = NSMakeRange(0, objects.count <= chunkSize ? objects.count:chunkSize)
    var saveArray:NSArray = (objects as NSArray).subarrayWithRange(range)
    var nextArray:NSArray = []
    if range.length < objects.count {
        nextArray = (objects as NSArray).subarrayWithRange(NSMakeRange(range.length, objects.count-range.length))
    }
    PFObject.saveAllInBackground(saveArray) { (succeeded:Bool, error: NSError!) -> Void in
        if (error == nil && succeeded && nextArray.count != 0) {
            trigger(true)
            PFObject.saveAllInBackground(nextArray, chunkSize: chunkSize, block: block, trigger: trigger)
        } else {
            trigger(true)
            block(succeeded,error)
        }
    }
}

}