UISegmentedControl with views animation code review please - ios

Question

I am just trying things out in Swift, and just made my first animation using UISegmentedControl, that switch between view, can you help me with a little code review to know that I am on the right track?
import UIKit;
class ViewLikes:UIViewController {
var innerViews:[UIViewController] = [UIViewController]()
var currentIndex:Int = 0;
var centerView:UIViewController = UIViewController()
override func viewDidLoad() {
super.viewDidLoad()
title = "some title";
var view1:UIViewController = UIViewController()
var lab1:UILabel = UILabel(frame: CGRectMake(0, 10, 200, 21))
lab1.center = CGPointMake(160, 284)
lab1.textAlignment = NSTextAlignment.Center
lab1.text = "I'am a label1"
view1.view.addSubview(lab1)
var view2:UIViewController = UIViewController()
var lab2:UILabel = UILabel(frame: CGRectMake(0, 10, 200, 21))
lab2.center = CGPointMake(160, 284)
lab2.textAlignment = NSTextAlignment.Center
lab2.text = "I'am a label2"
view2.view.addSubview(lab2)
var view3:UIViewController = UIViewController()
var lab3:UILabel = UILabel(frame: CGRectMake(0, 10, 200, 21))
lab3.center = CGPointMake(160, 284)
lab3.textAlignment = NSTextAlignment.Center
lab3.text = "I'am a label3"
view3.view.addSubview(lab3)
innerViews.append(view1)
innerViews.append(view2)
innerViews.append(view3)
var segmentControl:UISegmentedControl = UISegmentedControl(items:["blah", "blah1", "blah2"]);
segmentControl.selectedSegmentIndex = currentIndex;
segmentControl.addTarget(self, action:"segmentSwitch:" , forControlEvents:UIControlEvents.ValueChanged )
segmentControl.setTranslatesAutoresizingMaskIntoConstraints(false)
self.centerView.view.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(segmentControl)
self.view.addSubview(self.centerView.view)
var currentView = self.innerViews[0]
currentView.viewWillAppear(false)
self.centerView.view.addSubview(currentView.view)
currentView.viewDidAppear(false)
//Set layout
var viewsDict = Dictionary <String, UIView>()
viewsDict["segment"] = segmentControl;
viewsDict["center"] = self.centerView.view;
self.view.addConstraint(NSLayoutConstraint(item: segmentControl,
attribute: NSLayoutAttribute.Top,
relatedBy: NSLayoutRelation.Equal,
toItem: self.topLayoutGuide,
attribute: NSLayoutAttribute.Bottom,
multiplier: 1, constant: 10))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[segment]-|",
options: NSLayoutFormatOptions(0),
metrics: nil,
views: viewsDict))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[center]-0-|",
options: NSLayoutFormatOptions(0),
metrics: nil,
views: viewsDict))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[segment]-[center]-0-|",
options: NSLayoutFormatOptions(0),
metrics: nil,
views: viewsDict))
}
func segmentSwitch(control:UISegmentedControl) {
selectView(control.selectedSegmentIndex)
}
func selectView(index:Int) {
var currentView = self.innerViews[self.currentIndex]
var nextView = self.innerViews[index]
nextView.viewWillAppear(false)
self.centerView.view.addSubview(nextView.view)
nextView.viewDidAppear(false)
if(index > currentIndex) {
nextView.view.frame.origin.x = nextView.view.frame.width;
} else {
nextView.view.frame.origin.x -= nextView.view.frame.width;
}
UIView.animateWithDuration(0.8,
animations: {
var currentFrame = currentView.view.frame;
var nextFrame = nextView.view.frame;
if(index > self.currentIndex) {
currentFrame.origin.x -= currentFrame.size.width;
} else {
currentFrame.origin.x = currentFrame.size.width;
}
nextFrame.origin.x = 0.0;
currentView.view.frame = currentFrame
nextView.view.frame = nextFrame
}, completion: {finished in
currentView.viewWillDisappear(false)
currentView.view.removeFromSuperview()
currentView.viewDidDisappear(false)
}
);
self.currentIndex = index
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
for innerView in self.innerViews {
innerView.didReceiveMemoryWarning();
}
}
}