keyboardwasshown animated swift - ios

Question

there is UITextView at the bottom of design .When I try to write something keyboard stays down because of that I increase it as keyboard height but there is a problem. Keyboard comes from before TextView and it doesn't look nice .However on the Whatsapp and swarm applications it doesn't happen like this keyboard increasing with the TextView at the same time . How can I make them timing . You can see the my codes on the below
Sincerely
var frameMessageView = UIView()
var mesajtext = UITextView()
var resultScrollView = UIScrollView()
var lblcizgi = UILabel();
var topImg = UIImageView();
let place = ""
override func viewDidLoad() {
super.viewDidLoad()
self.automaticallyAdjustsScrollViewInsets = false
let theWidth = view.frame.size.width
let theHeight = view.frame.size.height
let backButton = UIBarButtonItem(title: "Geri", style: UIBarButtonItemStyle.Plain, target: self, action: "goBack:")
navigationItem.leftBarButtonItem = backButton
navigationItem.leftBarButtonItem?.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Helvetica Neue", size: 15.0)!], forState: UIControlState.Normal)
self.tabBarController?.tabBar.hidden = true
webView.delegate = self
webView.scrollView.bounces = false
resultScrollView.frame = CGRectMake(0, 67, theWidth, theHeight-112)
resultScrollView.backgroundColor = UIColor.blueColor()
topImg.frame = CGRectMake(0, 64, theWidth, 3)
topImg.image = UIImage(named:"top-bottom")
webView.frame = CGRectMake(0, 0, self.resultScrollView.frame.size.width, UIScreen.mainScreen().bounds.height-102)
view.backgroundColor = UIColor.blackColor()
frameMessageView.frame = CGRectMake(0, theHeight - 45, theWidth, 45)
frameMessageView.backgroundColor = UIColor(red: 247.0/255.0, green: 247.0/255.0, blue: 247.0/255.0, alpha: 1.0)
mesajtext.font = UIFont(name: "Helvetica Neue", size: 15.0)
mesajtext.frame = CGRect(x: 10, y: 10, width: self.view.frame.size.width - 75, height: 27)
mesajtext.backgroundColor = UIColor.whiteColor()
mesajtext.layer.cornerRadius = 5.0
mesajtext.layer.masksToBounds = true
mesajtext.layer.borderColor = UIColor( red: 203/255, green: 203/255, blue:203/255, alpha: 1.0 ).CGColor
mesajtext.layer.borderWidth = 1.0
lblcizgi.frame = CGRectMake(0, 0, frameMessageView.frame.width, 1)
lblcizgi.backgroundColor = UIColor(red: 203/255, green: 203/255, blue: 203/255, alpha: 0.5)
let button = UIButton()
button.frame = CGRectMake(self.view.frame.maxX-65, 13, 60, 20)
//button.backgroundColor = UIColor(red: 251.0/255.0, green: 188.0/255.0, blue: 5.0/255.0, alpha: 1.0)
button.setTitle("Gönder", forState: UIControlState.Normal)
button.setTitleColor(UIColor(red: 27/255, green: 119/255, blue: 218/255, alpha: 1.0), forState: UIControlState.Normal)
button.addTarget(self, action: "gonderbutonclick:", forControlEvents: UIControlEvents.TouchUpInside)
button.titleLabel!.font = UIFont(name:"Helvetica Neue", size: 14.0)
applyPlaceholderStyle(mesajtext , placeholderText: place)
mesajtext.delegate = self
frameMessageView.addSubview(lblcizgi)
frameMessageView.addSubview(mesajtext)
frameMessageView.addSubview(button)
view.addSubview(frameMessageView)
view.addSubview(resultScrollView)
view.addSubview(topImg)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardDidShowNotification, object: nil)
}
func keyboardWasShown(notification: NSNotification) {
let dict:NSDictionary = notification.userInfo!
let s:NSValue = dict.valueForKeyPath(UIKeyboardFrameEndUserInfoKey) as! NSValue
let rect:CGRect = s.CGRectValue()
UIView.animateWithDuration(0, delay: 0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.resultScrollView.frame = CGRectMake(0, 67, self.view.frame.size.width, self.view.frame.height-rect.height-112)
self.frameMessageView.frame.origin.y = self.resultScrollView.frame.maxY
}) { (Bool) -> Void in
}
}