[swift]Navigation Controller (2) 傳遞參數

如果要在換頁時讓PageA傳遞數值給PageB,並且在PageB顯示傳遞的參數時作法如下

• 先在PageB的Controller新增一個Label,我們將用它來顯示PageA究竟傳了什麼過來```swift
  import UIKit
  class Page_B_ViewController: UIViewController {
  @IBOutlet weak var lblValue: UILabel! //顯示傳遞數值的Label
  var fromA_Value:String!;//儲存Page_A傳遞過來的數值
  override func viewDidLoad() {

    super.viewDidLoad();
    lblValue.text = fromA_Value;
  

  }
  }

*   接著在PageA Controller新增**prepareForSegue**事件 ```swift
import UIKit
class Page_A_ViewController: UIViewController {

        override func viewDidLoad() {
        super.viewDidLoad()
        //NavBar
        self.navigationController?.navigationBar.barTintColor = UIColor(red: 0.58, green: 0.761, blue: 0.231, alpha: 1)
        let titleDic : NSDictionary = [NSForegroundColorAttributeName : UIColor.whiteColor()]; //字的顏色
        self.navigationController?.navigationBar.titleTextAttributes = titleDic;
        self.navigationController?.navigationBar.tintColor = UIColor.whiteColor() //按鈕的顏色
        let barOptionIcon : UIBarButtonItem = UIBarButtonItem(image: UIImage(named: "icon-options"), style: UIBarButtonItemStyle.Plain, target: self, action: "PushToOptionController:");
        self.navigationController?.navigationBar.topItem?.setRightBarButtonItem(barOptionIcon, animated: true) ;
    }

        override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    //右上角Button按下時觸發的事件
    func PushToOptionController(sender: UIBarButtonItem) {
        self.performSegueWithIdentifier("toPageB", sender: self);
    }
    //準備跳轉頁面的設定
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if(segue.identifier == "toPageB"){
            var page_b:Page_B_ViewController? = segue.destinationViewController as? Page_B_ViewController
            if(page_b != nil){
                page_b?.fromA_Value = "來自Ａ的數值";
            }
        }
    }
}

• 完成!!!