SecondViewController.swift

import UIKit

class SecondViewController: UIViewController {

    let divisionsName: [String] = ["東京都", "神奈川県", "埼玉県", "千葉県"]
    var divisionButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // ボタンを生成する
        self.createDivisionButton()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    func createDivisionButton() {
        for (index, division) in enumerate(self.divisionsName) {
            
            divisionButton = UIButton()
            
            divisionButton.frame = CGRectMake(0, 0, 300, 50)
            divisionButton.setTitle(division, forState: .Normal)
            divisionButton.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)

            var yPosition: CGFloat = CGFloat(150 + (index * 40))
            divisionButton.layer.position = CGPoint(x: self.view.frame.width/2, y: yPosition)
            
            divisionButton.tag = index

            divisionButton.addTarget(self, action: "divisionTap:", forControlEvents:.TouchUpInside)

            //viewにボタンを追加する
            self.view.addSubview(divisionButton)
        }
    }
    
    // 選択した値を保持し、最初の画面に遷移
    func divisionTap(sender: UIButton) {
        
        var firstView : AnyObject = self.storyboard?.instantiateViewControllerWithIdentifier("firstView") as! UIViewController
        
        // 選択された値をセット
        var viewController = firstView as! ViewController
        viewController.selectDivision = divisionsName[sender.tag]
        
        self.presentViewController(viewController, animated: true, completion: nil)
    }
}

ViewController.swift

import UIKit

class ViewController: UIViewController {
    
    var selectDivision = "未選択"
    
    @IBOutlet weak var divisionLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // ラベルに値をセット
        self.divisionLabel.text = self.selectDivision
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func cancel(sender: UIStoryboardSegue) {
    }
}