实现iOS启动页淡出效果

只要一个方法就够了,思路是launchScreen作为window的一个addsubview
demo地址:https://github.com/w11p3333/LaunchDemo

在LaunchScreen中将Storyboard ID设置为Launch
实现以下方法

private func launchAnimation()
{

let vc = UIStoryboard(name: "LaunchScreen", bundle: nil).instantiateViewControllerWithIdentifier("Launch")
let launchview = vc.view
let delegate = UIApplication.sharedApplication().delegate
let mainWindow = delegate?.window
mainWindow!!.addSubview(launchview)


UIView.animateWithDuration(1, delay: 0.5, options: UIViewAnimationOptions.BeginFromCurrentState, animations: {
    launchview.alpha = 0.0
    launchview.layer.transform = CATransform3DScale(CATransform3DIdentity, 1.5, 1.5, 1.0)
}) { (finished) in
    launchview.removeFromSuperview()
    }



  }

注意：若是应用使用storyboard中加载的，需要在初始界面的viewcontroller的viewDidAppear方法中调用。

若是应用从代码中加载的，需要在AppDelegate中didFinishLaunchingWithOptions方法中调用