PickerView demo

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var pickerView: UIPickerView!
    let colors = ["xanh", "do", "vang", "den"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return colors.count
    }

    func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return 50
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return colors[row]
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if (row == 0) {
            self.view.backgroundColor = UIColor.blueColor()
        } else if (row == 1) {
            self.view.backgroundColor = UIColor.redColor()
        } else if (row == 2) {
            self.view.backgroundColor = UIColor.yellowColor()
        } else {
            self.view.backgroundColor = UIColor.blackColor()
        }
    }

}