UIPickerView swift

//
// ViewController.swift
// UILabelTest
//
// Created by mac on 15/6/23.
// Copyright (c) 2015年 fangyuhao. All rights reserved.
//

import UIKit

class ViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {

var pickerView:UIPickerView!

override func viewDidLoad() {
    super.viewDidLoad()
    pickerView = UIPickerView()
    pickerView.dataSource = self
    pickerView.delegate = self
    //设置选择框的默认值
    pickerView.selectRow(1, inComponent: 0, animated: true)
    pickerView.selectRow(2, inComponent: 1, animated: true)
    pickerView.selectRow(3, inComponent: 2, animated: true)
    self.view.addSubview(pickerView)
    //建立一个按钮，触摸按钮时获得选择框被选择的索引
    var button = UIButton(frame: CGRectMake(0, 0, 100, 30))
    button.center = self.view.center
    button.backgroundColor = UIColor.blueColor()
    button.setTitle("获取信息", forState: .Normal)
    button.addTarget(self, action: "getPickerViewValue", forControlEvents: UIControlEvents.TouchUpInside)
    self.view.addSubview(button)



    // Do any additional setup after loading the view, typically from a nib.
}
//设置选择框的列数为3列
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 3
}
//设置选择框行数为9行
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return 9
}
//设置选择框各选项的内容，
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return String(row)+"-"+String(component)
}
//调整选择框的尺寸
func pickerView(pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
    if(0==component){
        return 100
    }else{
        return 30
    }
}
//检测行的选择状态
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    println(component)
    println(row)
}
//触摸时，获得选中的索引
func getPickerViewValue(){
    var alertView = UIAlertView()
    alertView.title = "被选中的索引为"
    alertView.message = String(pickerView.selectedRowInComponent(0))+"-"+String(pickerView.selectedRowInComponent(1))+"-"+String(pickerView.selectedRowInComponent(2))
    alertView.addButtonWithTitle("OK")
    alertView.show()
}

}