iOS Swift界面viewcontroller跳转

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iOS开发中界面跳转有两种方式，上下跳转和左右跳转。

上下跳转_打开：

let secondViewController = SecondViewController()  
self.presentViewController(secondViewController, animated: true, completion: nil)  

上下跳转_关闭：

self.dismissViewControllerAnimated(true, completion: nil)  

左右跳转_打开:

（将新的视图控制器PUSH到navigationController中，相当于入栈操作）

let secondViewController = SecondViewController()  
self.navigationController!.pushViewController(secondViewController, animated: true)  

左右跳转_关闭：

（将当前视图控制器从导航视图控制器堆栈中移除，从而返回到了上一级界面）

BACK_到上一级:

let firstViewController = FirstViewController()  
self.navigationController?.popViewControllerAnimated(true)  

BACK_指定界面：

// 获得视图控制器中的某一视图控制器  
let viewController = self.navigationController?.viewControllers[0]  
self.navigationController?.popToViewController(viewController as! UIViewController, animated: true)  

BACK_根视图：

self.navigationController?.popToRootViewControllerAnimated(true)  

根视图的设置需要在AppDelegate中设置

var window: UIWindow?  

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool  
{  
    var firstViewController = FirstViewController()  
    var rootNavigationViewController = UINavigationController(rootViewController: firstViewController)  
          
    self.window!.rootViewController = rootNavigationViewController  
          
    return true  
} 

手写界面

var vc = ViewController() 
self.presentViewController(vc, animated: true, completion: nil)

storyboard制作页面

var sb = UIStoryboard(name: "Main", bundle:nil)  
var vc = sb.instantiateViewControllerWithIdentifier("VC") as ViewController
//VC为该界面storyboardID，Main.storyboard中选中该界面View，Identifier inspector中修改
self.presentViewController(vc, animated: true, completion: nil)


self.performSegueWithIdentifier("VC", sender: nil)

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