导航栏的设置与处理

*首先创建一个视图，并创建好导航栏管理控件

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
       //创建一个窗口
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        //使窗口可见
        self.window?.makeKeyAndVisible()
        //关联ViewController
        let viewCrt = ViewController()
        //创建导航栏管理器
        let navCrt = UINavigationController(rootViewController: viewCrt)
        self.window?.rootViewController = navCrt
        //设置导航栏颜色
        navCrt.navigationBar.barTintColor = UIColor.redColor()
        //设置导航栏上所有添加上去的视图颜色（包括label和button／image）
        navCrt.navigationBar.tintColor = UIColor.blackColor()
        return true
    }

*然后进行添加导航栏上的东西

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.whiteColor()
        
        //创建一个系统button
        let button = UIButton(type: .System)
        button.frame = CGRect(x: self.view.frame.size.width / 2 - 50, y: self.view.frame.size.height / 2 - 25, width: 100, height: 50)
        
        button.tintColor = UIColor.redColor()
        button.setTitle("first page", forState: .Normal)
        button.addTarget(self, action: #selector(didClick(_:)), forControlEvents: .TouchUpInside)
        self.view.addSubview(button)
        
        //设置导航栏上的中间title内容，默认为居中
        self.navigationItem.title = "首页"
        
        //设置系统的图标摆放至导航栏左侧
//        self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Edit, target: self, action: #selector(didClick(_:)))
        self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "返回", style: .Done, target: self, action: nil)
        
        //设置导航栏右侧内容，添加一个button，点击触发事件为didClick
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "下一页", style: .Plain, target: self, action: #selector(didClick(_:)))
    }
    
    func didClick(sender: UIButton){
        let seconde = secondeViewController()
        //以栈的形式将第二个页面弹出（push）
        self.navigationController?.pushViewController(seconde, animated: true)
    }
    deinit {
        print("first")
    }
}

*触发点击事件，创建第二个页面，第二个页面的代码如下：

import UIKit

class secondeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.greenColor()
    }
    //设置默认的返回点击页面（以栈的方式将之前的页面返回，pop）
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.navigationController?.popViewControllerAnimated(true)
    }
    
    deinit {
        print("second")
    }
    
}