IOS - 两个控制器之间的自定义segue动画

Question

我正在尝试实现像这样的自定义segue动画

https://www.dropbox.com/s/ptyn84g7fdbthcc/video-1449571130.mp4.mp4?dl=0

现在我正在使用此代码

ViewController.swift

@IBAction func loginScreen(sender: UIButton)
{
self.performSegueWithIdentifier("customSegue", sender: self)
}

CustomSegue.swift

override func perform()
{
let sourceVC = self.sourceViewController
let destinationVC = self.destinationViewController

sourceVC.view.addSubview(destinationVC.view)

destinationVC.view.transform = CGAffineTransformMakeScale(0.05, 0.05)

UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveEaseInOut, animations: { () -> Void in

destinationVC.view.transform = CGAffineTransformMakeScale(1.0, 1.0)

}) { (finished) -> Void in

destinationVC.view.removeFromSuperview()

let time = dispatch_time(DISPATCH_TIME_NOW, Int64(0.001 * Double(NSEC_PER_SEC)))

dispatch_after(time, dispatch_get_main_queue()) {

sourceVC.presentViewController(destinationVC, animated: false, completion: nil)

}
}
}

这是两个问题。首先是

显然，这段代码并不像我分享的视频那样靠近动画。我不知道应该设置哪些动画属性来复制动画，就像视频

一样

第二个问题是

在我的segue结束时，屏幕闪烁，好像在destination.removeFromSuperview（）和source.present ...

之间有延迟。