初始化
//Swift
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
//Objective-c
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
//Swift
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
//Objective-c
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];