Quick hack to animate launch xib on launch

AppDelegate.swift

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        var showOverlay = true // whatever you want
        if showOverlay {
            LaunchOverlayWindow.register(self.window!, duration: nil) { (overlayWindow) in
                overlayWindow.transform = CGAffineTransformMakeScale(6.0, 6.0)
                overlayWindow.alpha = 0.0
            }
        }
        self.window!.makeKeyAndVisible()
        
        return true
    }
}

LaunchOverlayWindow.swift

import UIKit

class LaunchOverlayWindow: UIWindow {
    static func register(appWindow: UIWindow, duration: NSTimeInterval?, effect: ((UIWindow) -> Void)?) {
        var notificationIdentifer: AnyObject!
        notificationIdentifer = NSNotificationCenter.defaultCenter().addObserverForName(
            UIApplicationDidFinishLaunchingNotification, object: nil, queue: nil) { (notification) -> Void in
            let objects = NSBundle.mainBundle().loadNibNamed("LaunchScreen", owner: self, options: nil)
            if let view = objects[0] as? UIView {
                let overlayWindow = LaunchOverlayWindow(frame: appWindow.bounds)
                overlayWindow.addSubview(view)
                overlayWindow.setTranslatesAutoresizingMaskIntoConstraints(false)
                view.setTranslatesAutoresizingMaskIntoConstraints(false)
                let viewBinding = ["subview": view]
                overlayWindow.addConstraints(
                    NSLayoutConstraint.constraintsWithVisualFormat(
                        "V:|[subview]|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewBinding)
                    +
                    NSLayoutConstraint.constraintsWithVisualFormat(
                        "H:|[subview]|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewBinding)
                )
                overlayWindow.makeKeyAndVisible()
                
                UIView.animateWithDuration(duration ?? 0.5, animations: { () -> Void in
                    if let effect = effect {
                        effect(overlayWindow)
                    } else {
                        overlayWindow.alpha = 0.0
                    }
                }, completion: { (finished) -> Void in
                    appWindow.makeKeyAndVisible()
                    overlayWindow.removeFromSuperview()
                    
                    NSNotificationCenter.defaultCenter().removeObserver(notificationIdentifer)
                })
            }
        }
    }
}