关于自适应iphone、ipad布局的代码

 刚看到一段代码，关于自适应iphone、ipad布局的，有点启发，记载一下
 - (id)init
 {
     if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
         [super initWithNibName:@"MainView~ipad" bundle:nil];
     } else {
         [super initWithNibName:@"MainView" bundle:nil];
     }

     [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(screenDidConnectNotification:) name: UIScreenDidConnectNotification object: nil];
     [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(screenDidDisconnectNotification:) name: UIScreenDidDisconnectNotification object: nil];
     [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(screenModeDidChangeNotification:) name: UIScreenModeDidChangeNotification object: nil];

     return self;
 }

 - (id)initWithNibName:(NSString *)n bundle:(NSBundle *)b
 {
     return [self init];
 }