代码如下：

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate
@synthesize myController;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
NSStoryboard *storyBoard = [NSStoryboard storyboardWithName:@"Main" bundle:nil]; // get a reference to the storyboard
myController = [storyBoard instantiateControllerWithIdentifier:@"secondWindowController"]; // instantiate your window controller
[myController showWindow:self]; // show the window
}

@end