[置顶] swift -NavigationController,代理传值

//
//  ViewController.swift
//  NavigationController
//


import UIKit
import Foundation

class ViewController: UIViewController,FontSizeChangDelegate {

    var  myLabel :UILabel?;//声明一个UILabel对象 全局的
    override func viewDidLoad() {
        super.viewDidLoad()
        //self.title = "百度";
        self.navigationItem.title = "百度";
        
        let nextItem = UIBarButtonItem(title: "下一页", style: .Plain, target: self, action: "nextPage");
        self.navigationItem.rightBarButtonItem = nextItem;
        
        //放一个Label可以显示文字
        let rect = CGRect(x: 0, y: 100, width: 320, height: 44);
        myLabel = UILabel(frame: rect);
        myLabel!.text = "欢迎来到百度";
        self.view.addSubview(myLabel!);
       
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    func nextPage(){
        NSLog("按钮被点击了");
        let svc = SubViewController();
        
        //设置这个协定
        
        svc.delegate = self;
        self.navigationController?.pushViewController(svc, animated: true);
        
    }
//  代理办法
    func fontSizeDidChange(controller: SubViewController, fontSize: Int) {
        println("controller is\(controller) fontsize:\(fontSize)");
        let font = UIFont.systemFontOfSize(Float(fontSize));//这里有毛病
        myLabel!.font = font;
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}
//
//  ViewController.swift
//  NavigationControll