swift 怎么创建一个viewcontroller

1、新建一个Empty Application,只选Use Automatic Reference Counting,Use Core Data和Include Unit Tests不选。2、Command+N　新建文件，选Cocoa Touch UIViewController subclass,SubClass of UIViewController,勾选with XIB for user interface(当然你也可以再建)。我这输的名字是MainViewController,最终生成MainViewController.h MainViewController.m MainViewController.xib三个文件。3、打开(前缀)AppDelegate.h,代码如下:[objc] view plaincopy#import #import "MainViewController.h" @interface BIDAppDelegate : UIResponder @property (strong, nonatomic) UIWindow *window; @property (strong,nonatomic) MainViewController * controller; @end AppDelegate.m，修改(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions　方法：[objc] view plaincopy- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. self.controller= [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil]; UIView *mainView=self.controller.view; CGRect mainViewFrame=mainView.frame; mainViewFrame.origin.y+=[UIApplication sharedApplication].statusBarFrame.size.height; //将y座标移到状态栏下 mainView.frame=mainViewFrame; [self.window addSubview:mainView]; //载入 self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; return YES; } 4、随便在MainViewController.xib中添加个控件，运行测试。swift 怎么创建一个viewcontroller