Swift PageControl

import UIKit

var arrColor:NSArray!
var testView:UIView!

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        arrColor = [UIColor.orangeColor(),UIColor.yellowColor(),UIColor.grayColor(),UIColor.blueColor()];

        let pageControl = UIPageControl.init(frame: CGRectMake(50,70,self.view.frame.size.width-100,20))
        pageControl.backgroundColor = UIColor.orangeColor()
        pageControl.numberOfPages = 4;
        pageControl.currentPage = 0;
        pageControl.currentPageIndicatorTintColor = UIColor.redColor()
        pageControl.addTarget(self,action: Selector("click:"),forControlEvents: UIControlEvents.ValueChanged)
        self.view.addSubview(pageControl)

        testView = UIView.init(frame: CGRectMake(10,120,self.view.frame.size.width-20,100))
        testView.backgroundColor = UIColor.redColor()
        self.view.addSubview(testView)
    }

    func click(sender:UIPageControl) {
        testView.backgroundColor = arrColor[sender.currentPage] as? UIColor
    }
}