UIAlertControllerを時間差で閉じる方法

２秒後に自動で閉じる

Swift

let alert: UIAlertController = UIAlertController(title: "", message: "Alert", preferredStyle: .Alert)
self.presentViewController(alert, animated: true) { () -> Void in
            let delay = 2.0 * Double(NSEC_PER_SEC)
            let time  = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
            dispatch_after(time, dispatch_get_main_queue(), {
                self.dismissViewControllerAnimated(true, completion: nil)
            })
        }

意外と簡単便利。