swift - Xcode 错误：“int”类型的值没有成员“类型”/但在这种情况下我应该使用什么成员？

Question

在那种情况下我应该使用什么成员？

let alertController = NSAlert(title: nil, message: "Place Not Found", preferredStyle: NSAlertFirstButtonReturn.Type)

整个街区：

if localSearchResponse == nil{
                    let alertController = NSAlert(title: nil, message: "Place Not Found", preferredStyle: NSAlertFirstButtonReturn.Type)
                    alertController.addAction(NSAlertDelegate(title: "Dismiss", style: NSAlertStyle.Default, handler: nil))
                    self.presentViewController(alertController, animated: true, completion: nil)
                    return