XCODE 6 GM issue

[DirkLXX]

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var viewController:UIViewController = segue.destinationViewController as UIViewController
    var ChartLabel:UILabel = UILabel(frame: CGRectMake(0, 90, 320.0, 30))

    ChartLabel.textColor = PNGreenColor
    ChartLabel.font = UIFont(name: "Avenir-Medium", size:23.0)
    ChartLabel.textAlignment = NSTextAlignment.Center

//
////MasterViewController.swift:39:33: Cannot convert the expression's type 'String?' to type 'NSString'
//
switch segue.identifier as NSString {
case "lineChart":
//Add LineChart
ChartLabel.text = "Line Chart"

[kevinzhow]

try Xcode 6.0.1

[danieleratti]

Same problem here, with XCode 6.1
What's wrong?

[gpadmanabhan]

Same problem with Xcode 6.1... Any workaround ?