Swift: Is it possible to remove View Controller from stack? - ios

Question

I found a Github repository where the user has created a launch animation like in twitters app: This
This works best if the icon is a solid shape and being centered in the screen.
My problem is that I can center my icon because how its designed. So when my animation is finished the app will still have some masking left on the screen from the previously View Controller that made the animation.
So is it possible to remove that View Controller completely once the animation is done and the app hits the table view View Controller?
Here is my code:
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window!.backgroundColor = UIColor(red: 241/255, green: 196/255, blue: 15/255, alpha: 1)
self.window!.makeKeyAndVisible()
// rootViewController from StoryBoard
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var navigationController = mainStoryboard.instantiateViewControllerWithIdentifier("navigationController") as! UIViewController
self.window!.rootViewController = navigationController
// logo mask
navigationController.view.layer.mask = CALayer()
navigationController.view.layer.mask.contents = UIImage(named: "logo.png")!.CGImage
navigationController.view.layer.mask.bounds = CGRect(x: 0, y: 0, width: 10, height: 10)
navigationController.view.layer.mask.anchorPoint = CGPoint(x: 0.5, y: 0.5)
navigationController.view.layer.mask.position = CGPoint(x: navigationController.view.frame.width / 2, y: navigationController.view.frame.height / 2)
// logo mask background view
var maskBgView = UIView(frame: navigationController.view.frame)
maskBgView.backgroundColor = UIColor.whiteColor()
navigationController.view.addSubview(maskBgView)
navigationController.view.bringSubviewToFront(maskBgView)
// logo mask animation
let transformAnimation = CAKeyframeAnimation(keyPath: "bounds")
transformAnimation.delegate = self
transformAnimation.duration = 1
transformAnimation.beginTime = CACurrentMediaTime() + 1 //add delay of 1 second
let initalBounds = NSValue(CGRect: navigationController.view.layer.mask.bounds)
let secondBounds = NSValue(CGRect: CGRect(x: 0, y: 0, width: 50, height: 50))
let finalBounds = NSValue(CGRect: CGRect(x: 0, y: 0, width: 2000, height: 2000))
transformAnimation.values = [initalBounds, secondBounds, finalBounds]
transformAnimation.keyTimes = [0, 0.5, 1]
transformAnimation.timingFunctions = [CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut), CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)]
transformAnimation.removedOnCompletion = false
transformAnimation.fillMode = kCAFillModeForwards
navigationController.view.layer.mask.addAnimation(transformAnimation, forKey: "maskAnimation")
// logo mask background view animation
UIView.animateWithDuration(0.1,
delay: 1.35,
options: UIViewAnimationOptions.CurveEaseIn,
animations: {
maskBgView.alpha = 0.0
},
completion: { finished in
maskBgView.removeFromSuperview()
})
// root view animation
UIView.animateWithDuration(0.25,
delay: 1.3,
options: UIViewAnimationOptions.TransitionNone,
animations: {
self.window!.rootViewController!.view.transform = CGAffineTransformMakeScale(1.05, 1.05)
},
completion: { finished in
UIView.animateWithDuration(0.3,
delay: 0.0,
options: UIViewAnimationOptions.CurveEaseInOut,
animations: {
self.window!.rootViewController!.view.transform = CGAffineTransformIdentity
},
completion: nil
)
})
And the problem is worse on iPad where the screen is bigger = more masking left on the screen.

Answer 1

You need to remove the mask after the animation is done.
UIView.animateWithDuration(0.25,
delay: 1.3,
options: UIViewAnimationOptions.TransitionNone,
animations: {
self.window!.rootViewController!.view.transform = CGAffineTransformMakeScale(1.05, 1.05)
},
completion: { finished in
UIView.animateWithDuration(0.3,
delay: 0.0,
options: UIViewAnimationOptions.CurveEaseInOut,
animations: {
self.window!.rootViewController!.view.transform = CGAffineTransformIdentity
},
completion: {
// ADDED THIS LINE
self.window!.rootViewController!.view.layer.mask = nil
}
)
})