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    public override func layoutSubviews() {
        super.layoutSubviews()

        // If the view is animating apply the animation to the sublayer
        CATransaction.begin()
        if let animation = layer.animationForKey("position") {
            CATransaction.setAnimationDuration(animation.duration)
            CATransaction.setAnimationTimingFunction(animation.timingFunction)
        } else {
            CATransaction.disableActions()

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import WebKit

class NativeWebViewController: UIViewController {

    let viewportScriptString = "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); meta.setAttribute('initial-scale', '1.0'); meta.setAttribute('maximum-scale', '1.0'); meta.setAttribute('minimum-scale', '1.0'); meta.setAttribute('user-scalable', 'no'); document.getElementsByTagName('head')[0].appendChild(meta);"
    let disableSelectionScriptString = "document.documentElement.style.webkitUserSelect='none';"
    let disableCalloutScriptString = "document.documentElement.style.webkitTouchCallout='none';"

    override func viewDidLoad() {
        // 1 - Make user scripts for injection

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    /// Generate thumbnail with AVAssetImageGenerator
    func generateThumbnailFromAsset(asset: AVAsset, forTime time: CMTime) -> UIImage {
        let imageGenerator = AVAssetImageGenerator(asset: asset)
        imageGenerator.appliesPreferredTrackTransform = true
        var actualTime: CMTime = kCMTimeZero
        do {
            let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: &actualTime)
            let image = UIImage(CGImage: imageRef)
            return image
        } catch let error as NSError {

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    /**
     Batch request an array of images for background download task. This method fires completion block when ALL images are downloaded and returns an array of UIImage objects.
     - Parameter imageURLs: Array of strings representing location of images as URL's
     - Parameter completion: Block that provides a dictionary of downloaded images as argument. The dictionary contains images at the index they were passed in the original array and NSNull objects for images that failed to download.
     - Parameter imageScale: Scale to interpret image data for UIImage. A scale of 1.0 will keep full size of image. Default (imageScale = nil) is scale factor of UIScreen resolution.
    */
    @objc
    static func batchImageDownloadWithImageUrlArray(imageURLs: [String], imageScale: NSNumber?, completion: ((images: [Int : AnyObject]) -> Void)?) {
        var imageDict = [Int : AnyObject]() // This should be UIImage? but Objective-C can't have nil in dictionaries
        let manager = AFHTTPSessionManager()

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    public override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
        // Before rotation (willTransitionToInterfaceOrientation)
        // ... Do stuff that should happen before rotation ... //
        coordinator.animateAlongsideTransition({ (context) in
                // During rotation
                // ... Do stuff that should happen during rotation ... //
            },
            completion: { (context) in
                // After rotation (didTransitionToInterfaceOrientation)

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// 1.) Swift selectors must have @objc if they are not exposed to objective-c (i.e. they are private to a swift class)
// 2.) Make a failable initializer by adding an optional (?) after initializer (init?())
// 3.) To cast in a for in loop use "case". Use "where" to unwrap optionals or check a condition.
for case let button as AClass in view.subviews {
}
for view in childViews where view is UIButton {
}
for case let view as MyCustomView in self.view.subviews { 
  view.removeFromSuperview 
}

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extension UIViewController {
  func isVisible() -> Bool {
    return self.isViewLoaded() && self.view.window != nil
  }
}

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// Perform selector
self.performSelector(#selector(MyViewController.myFunction(_:)), withObject: myObject, afterDelay: 1.0)

// Cancel perform requests
self.classForCoder.cancelPreviousPerformRequestsWithTarget(self, selector: #selector(MyViewController.myFunction(_:)), object: myObject)

// Note: -
// myObject can be nil

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/**
Function that locks an object while it is being acted upon in the closure parameter. 
Rethrows allows the function to throw an error for throwing closures or not for non-throwing closures (do not need `try` for non-throwing closures). 
parameter lock: Object to be sync'd
parameter closure: Code of critical section
*/
public func synchronized<T>(lock: AnyObject, @noescape closure: () throws -> T) rethrows -> T {
    objc_sync_enter(lock)
    defer {
        objc_sync_exit(lock)

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public someFunction() {
        ({ self.someStringVariable = "Some value" })()
    }