在代码中创建ViewController2的方法
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let second = storyboard.instantiateViewControllerWithIdentifier("Second")
在代码中创建ViewController2的方法
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let second = storyboard.instantiateViewControllerWithIdentifier("Second")