iOS开发中界面跳转有两种方式，上下跳转和左右跳转。
下跳转_TO：
let secondViewController = SecondViewController() self.presentViewController(secondViewController, animated: true, completion: nil)
上跳转_BACK：
dismissViewControllerAnimated(true, completion: nil)
右跳转_TO:
（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)
左跳转_BACK：
（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
}
原文：http://www.cnblogs.com/niuni-623/p/6927969.html