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let image = UIImage(named: "images.jpeg")!

let degrees: Double = 90
let rads = CGFloat(M_PI * degrees / 180)
UIGraphicsBeginImageContext(CGSizeMake(image.size.height, image.size.width))
let ctx = UIGraphicsGetCurrentContext()

CGContextTranslateCTM(ctx, image.size.height/2, image.size.width/2)
CGContextRotateCTM(ctx, rads)
CGContextScaleCTM(ctx, 1.0, -1.0)

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let image = UIImage(named: "images.jpeg")!

UIGraphicsBeginImageContextWithOptions(image.size, false, 1.0)
var context = UIGraphicsGetCurrentContext()

//move and invert canvas by scaling
CGContextTranslateCTM(context, 0, image.size.height)
CGContextScaleCTM(context, 1, -1)

image.drawInRect(CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))

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func grayScale() -> UIImage {
    let width = self.size.width
    let height = self.size.height
    let imageRect:CGRect = CGRectMake(0, 0, width, height)
    let colorSpace = CGColorSpaceCreateDeviceGray()
    
    let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.None.rawValue)
    let context = CGBitmapContextCreate(nil, Int(width), Int(height), 8, 0, colorSpace, bitmapInfo.rawValue)
    
    CGContextDrawImage(context, imageRect, self.CGImage)

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func fixOrientation() -> UIImage {
    
    // No-op if the orientation is already correct
    if ( self.imageOrientation == UIImageOrientation.Up ) {
      return self;
    }
    
    // We need to calculate the proper transformation to make the image upright.
    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
    var transform: CGAffineTransform = CGAffineTransformIdentity

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class ViewController: UIViewController {

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    
    // Force view follow specific orientation
    let value = UIInterfaceOrientation.LandscapeRight.rawValue
    UIDevice.currentDevice().setValue(value, forKey: "orientation")
  }

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func cgImageFromSampleBuffer(sampleBuffer: CMSampleBuffer) -> CGImage {
    
    let pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)!
    let ciImage = CIImage(CVPixelBuffer: pixelBuffer)
    let context: CIContext = CIContext(options: nil)
    let rect = CGRectMake(0, 0, CGFloat(CVPixelBufferGetWidth(pixelBuffer)), CGFloat(CVPixelBufferGetHeight(pixelBuffer)))
    let cgImage = context.createCGImage(ciImage, fromRect: rect)
    
    return cgImage
  }

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func ciImageFromSampleBuffer(sampleBuffer: CMSampleBuffer) -> CIImage {
    let pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)!
    let attachments : CFDictionaryRef = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, pixelBuffer, CMAttachmentMode( kCMAttachmentMode_ShouldPropagate))!
    let ciImage = CIImage(CVPixelBuffer: pixelBuffer, options: attachments as? [String : AnyObject])
    return ciImage
  }

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class AWSS3Util: NSObject {

  class func uploadFileAtURL(fileURL: NSURL,
    fileName: String,
    progessCallBack: AWSNetworkingUploadProgressBlock?,
    responseCallBack: (error: NSError?) -> Void ) {
    
      let uploadRequest = AWSS3TransferManagerUploadRequest()
      uploadRequest.body = fileURL
      uploadRequest.key = fileName

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//http://blog.apoorvmote.com/uitapgesturerecognizer-to-switch-between-two-uiviews-in-ios-swift/

var isPurpleViewShowing = false
  @IBOutlet weak var greenView: UIView!
  @IBOutlet weak var purpleView: UIView!
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }

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extension UIView {
  func removeAllConstraints() {
    var superview = self.superview
    while superview != nil {
      for c in superview!.constraints {
        if c.firstItem as? UIView == self || c.secondItem as? UIView == self {
          superview!.removeConstraint(c)
        }
      }
      superview = superview!.superview