swift -NavigationController,代理傳值

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////  ViewController.swift//  NavigationController//import UIKitimport Foundationclass ViewController: UIViewController,FontSizeChangDelegate {    var  myLabel :UILabel?
;//聲明一個UILabel對象 全域的    override func viewDidLoad() {        super.viewDidLoad()        //self.title = "百度";        self.navigationItem.title = "百度";                let nextItem = UIBarButtonItem(title: "下一頁", style: .Plain, target: self, action: "nextPage");        self.navigationItem.rightBarButtonItem = nextItem;                //放一個Label能夠顯示文字        let rect = CGRect(x: 0, y: 100, width: 320, height: 44);        myLabel = UILabel(frame: rect);        myLabel!.text = "歡迎來到百度";        self.view.addSubview(myLabel!);               // Do any additional setup after loading the view, typically from a nib.    }        func nextPage(){        NSLog("按鈕被點擊了");        let svc = SubViewController();                //設定這個協議                svc.delegate = self;        self.navigationController?.pushViewController(svc, animated: true);            }//  代理方法    func fontSizeDidChange(controller: SubViewController, fontSize: Int) {        println("controller is\(controller) fontsize:\(fontSize)");        let font = UIFont.systemFontOfSize(Float(fontSize));//這裡有錯誤        myLabel!.font = font;    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

////  SubViewController.swift//  NavigationController//import UIKitimport Foundation//定義一個協議protocol FontSizeChangDelegate:NSObjectProtocol{    //定義的一個協議函數/代理的一個函數    //參數1 當前controller本身    //參數2 字型大小    func fontSizeDidChange(controller:SubViewController,fontSize:Int);}class SubViewController: UIViewController {    var fontSize:Int = 20;    //定義一個delegate對象    var delegate:FontSizeChangDelegate?;    override func viewDidLoad() {        super.viewDidLoad()        self.view.backgroundColor = UIColor .whiteColor();                self.title = "Page2";        //self.backgroundColor = UIColor .whiteColor();        // Do any additional setup after loading the view.        var btn = UIButton.buttonWithType(.System) as UIButton;        var frame = CGRect(x: 100, y: 100, width: 100, height: 100);        btn.frame = frame;        btn.setTitle("增大字型大小", forState: .Normal);        btn.addTarget(self, action: "clickMe:", forControlEvents:.TouchUpInside);        self.view.addSubview(btn);    }    func clickMe(sender:UIButton){        //self.navigationController?
.popToRootViewControllerAnimated(true);        fontSize++        println("fontsize is\(fontSize)");                if((delegate) != nil)        {            //調用裡面的協議方法            delegate?.fontSizeDidChange(self,fontSize:fontSize);        }    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        /*    // MARK: - Navigation    // In a storyboard-based application, you will often want to do a little preparation before navigation    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?
) {        // Get the new view controller using segue.destinationViewController.        // Pass the selected object to the new view controller.    }    */}

swift -NavigationController,代理傳值