gistfile1.txt

@IBAction func shareFacebook(sender: AnyObject) {
    
    
        if SLComposeViewController.isAvailableForServiceType(SLServiceTypeFacebook){
            var facebookSheet: SLComposeViewController = SLComposeViewController(forServiceType: SLServiceTypeFacebook)
            facebookSheet.setInitialText("Demo")
            self.presentViewController(facebookSheet, animated: true, completion: nil)
       
        } else {
            
            var alert = UIAlertController(title: "Hata", message: "Facebook aktif değil", preferredStyle: UIAlertControllerStyle.Alert)
            alert.addAction(UIAlertAction(title: "Tamam", style: UIAlertActionStyle.Default, handler: nil))
            self.presentViewController(alert, animated: true, completion: nil)
        }
       //Bu aşağıdaki kodu yazınca herşey dismiss oluyor :) Yani açılan Facebook Share penceresi de. Bari o kalsaydı.
       self.dismissViewControllerAnimated(true, completion: nil)
    }