UIAlertにUIPickerViewを表示する（Swift2.1）

UIAlertにUIPickerViewを表示させるメモ

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    
    let pv = UIPickerView()
    let items = [
        ["アイカツ", "プリパラ", "アイマス"],
        ["いちご", "ゆりか", "みずき", "あかり", "らぁら", "みれぃ", "そふぃ", "あんず"]
    ]
    var anime = ""
    var chara = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(true)
        // Alert
        let title = "トップアイドル"
        let message = "好きなアイドルを選択してください.\n\n\n\n\n\n\n\n" //改行入れないとOKCancelがかぶる
        let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler:{
            (action: UIAlertAction!) -> Void in
            print("あなたの好きなアイドルは、\(self.anime)の\(self.chara)です.")
        })
        let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { action in
        }
        
        // PickerView
        pv.selectRow(0, inComponent: 0, animated: true) // 初期値
        pv.frame = CGRectMake(0, 50, view.bounds.width * 0.85, 150) // 配置、サイズ
        pv.dataSource = self
        pv.delegate = self
        alert.view.addSubview(pv)
        
        alert.addAction(okAction)
        alert.addAction(cancelAction)
        presentViewController(alert, animated: true, completion: nil)
    }
    
    // PickerViewの列数
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return items.count
    }
    
    // PickerViewの行数
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return items[component].count
    }
    
    // PickerViewの項目
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return items[component][row]
    }
    
    // PickerViewの項目選択時
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if component == 0 {
            anime = items[0][row]
        } else {
            chara = items[1][row]
        }
        print("\(items[component][row])")
    }


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