UIPickerView 使用范例

//

//  ViewController.swift

//  PMBUI

//

//  Created by ScofieldRoger on 3/3/15.

//  Copyright (c) 2015 ScofieldRoger. All rights reserved.

//

import UIKit

class ViewController: UIViewController,UIPickerViewDelegate,UIPickerViewDataSource {

@IBOutlet weak var pickerView1: UIPickerView!

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.

pickerView1.delegate = self

pickerView1.dataSource = self

}

var names = ["computers","phones","mp3"]

var products = ["computers":["iMac","MacBook Pro","MacBook Air"],"phones":["iPhone 5","iPhone 5s","iPhone 6 Plus"],"mp3":["iPod touch","iPod Nano"]]

var selector : String = "computers"

//pickerView1 DataSource Part

// returns the number of 'columns' to display.

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{

return 2

}

// returns the # of rows in each component..

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{

if (component == 0) {

return names.count

}

else  {return products[selector]!.count}

}

//响应事件，根据点击载入项目

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{

if (component == 0) {

selector = names[row]

pickerView1.reloadComponent(1)

//每点一个项目，重载一次products

pickerView.selectRow(0, inComponent: 1, animated: true)

//将选项重新定位到第一个

return names[row]

}

else  {return products[selector]![row]}

//  else { return "?"}

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

}