Replace xib file with Main.storyboard file in App delegate class

Question

Right now project is using MainWindow.xib in App delegate class as main nib file. It has this code in main.m file

int main(int argc, char *argv[]) {  NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; } 

I want to replace it with Mainstoryboard. I changed it in the info.plist file as Mainstoryboard file base name but it shows error that there is no app delegate set. An app delegate class must be specified to use a main storyboard file.

What coding i should do in App delegate class to use Mainstoryboard file.

Thanks