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  func applicationDidEnterBackground(application: UIApplication) {
    // Create a pseudo background task to system call applicationWillTerminate when app enter background
    // Default system will not call applicationWillTerminate when app enter background
    // applicationWillTerminate only called when user close app in app switcher or some special cases of system
    bgTask = application.beginBackgroundTaskWithExpirationHandler({ () -> Void in
      application.endBackgroundTask(self.bgTask)
      self.bgTask = UIBackgroundTaskInvalid
    })

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { () -> Void in

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RKlcl_configure_by_name("RestKit/Network", RKlcl_vTrace.rawValue)
RKlcl_configure_by_name("RestKit/ObjectMapping", RKlcl_vDebug.rawValue)

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class RadioBox: UIButton {
  
  var borderColor: UIColor = UIColor.lightGrayColor()
  var innerColor: UIColor = UIColor.linkTextColor()
  var borderWidthPercent: Int = 40 {
    didSet {
      borderWidthPercent = max(min(borderWidthPercent, 90), 10)
    }
  }
  

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import UIKit

class CheckBox: UIButton {

  let roundedRectStrokeColor = UIColor.GBTint()
  let roundedRectFillColor = UIColor.whiteColor()
  let checkmarkColor = UIColor.greenColor()
  
  override func drawRect(rect: CGRect) {
    super.drawRect(rect)

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extension UIColor {
  
  class func mainTextColor() -> UIColor { return UIColor(hex: 0x000000) }

  class func subTextColor() -> UIColor { return UIColor(hex: 0x656565) }
}

extension UIColor {
  convenience init(red: Int, green: Int, blue: Int) {
    assert(red >= 0 && red <= 255, "Invalid red component")

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override func viewWillAppear(animated: Bool) {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
  }
  
  override func viewWillDisappear(animated: Bool) {
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
  }
  

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extension String {
  func heightWithConstrainedWidth(width: CGFloat, font: UIFont) -> CGFloat {
    let constraintRect = CGSize(width: width, height: CGFloat.max)
    
    let boundingBox = self.boundingRectWithSize(constraintRect, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: font], context: nil)
    
    return boundingBox.height
  }
  
  func isEmail() -> Bool {

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  func convertVideoToMP4WithInputURL(inputURL: NSURL, outputURL: NSURL, callback: (error: NSError?) -> ()) {
    
    let asset = AVURLAsset(URL: inputURL)
    let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetPassthrough)!
    exportSession.outputURL = outputURL
    exportSession.outputFileType = AVFileTypeMPEG4
    exportSession.exportAsynchronouslyWithCompletionHandler { 
      callback(error: exportSession.error)
    }
  }

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// Custom animation for pull to refresh function as of GMail app
// View figure https://blog.xamarin.com/wp-content/uploads/2013/06/device-swipe-down-refresh.png
// Use combine with https://github.com/jcavar/refresher

import Foundation
import Refresher
import QuartzCore

class BeatAnimator: UIView, PullToRefreshViewDelegate {
  

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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, image.size.width, 0)
CGContextScaleCTM(context, -1, 1)

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