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extension WKInterfaceController {
  
  func animateWithDuration(duration: NSTimeInterval, animations: () -> Void, completion: (() -> Void)?) {
    animateWithDuration(duration, animations: animations)
    let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(duration * Double(NSEC_PER_SEC)))
    dispatch_after(delay, dispatch_get_main_queue()) {
      completion?()
    }
  }
  

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//
//  ViewController.swift
//  WatchPairedExample
//
//  Created by 張 景隆 on 2015/11/26.
//  Copyright © 2015年 張 景隆. All rights reserved.
//

import UIKit
import WatchConnectivity

Appletone

extension NSManagedObject {

    // Returns the unqualified class name, i.e. the last component.
    // Can be overridden in a subclass.
    class func entityName() -> String {
        return String(self)
    }

    convenience init(context: NSManagedObjectContext) {
        let eName = self.dynamicType.entityName()

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// Fix for IOS 9 pop-over arrow anchor bug
// ---------------------------------------
// - IOS9 points pop-over arrows on the top left corner of the anchor view
// - It seems that the popover controller's sourceRect is not being set
//   so, if it is empty  CGRect(0,0,0,0), we simply set it to the source view's bounds
//   which produces the same result as the IOS8 behaviour.
// - This method is to be called in the prepareForSegue method override of all
//   view controllers that use a PopOver segue
//
//   example use:

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PS: If you liked this talk or like this concept, let's chat about iOS development at Stitch Fix! #shamelessplug

Protocol-Oriented Programming in Swift

Speaker: David Abrahams. (Tech lead for Swift standard library)

• "Crusty" is an old-school programmer who doesn't trust IDE's, debuggers, programming fads. He's cynical, grumpy.

• OOP has been around since the 1970's. It's not actually new.

• Classes are Awesome

  • Encapsulation
  • Access control

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protocol ImagePickable {
    var imagePicker:UIImagePickerController { get set }
    func openPhotoLibrary()
}

var AssociatedObjectHandle: UInt8 = 0
extension UIViewController : ImagePickable, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    var imagePicker:UIImagePickerController {
        get {

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var fetchedResultsProcessingOperations: [NSBlockOperation] = []

private func addFetchedResultsProcessingBlock(processingBlock:(Void)->Void) {
	fetchedResultsProcessingOperations.append(NSBlockOperation(block: processingBlock))
}

func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
	
	switch type {
	case .Insert:

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class MyManager  {
    private static let sharedInstance = MyManager()
    class var sharedManager : MyManager {
        return sharedInstance
    }
}

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extension Array where Element: Hashable {

        func after(item: Element) -> Element? {
            if let index = self.indexOf(item) where index + 1 < self.count {
                return self[index + 1]
            }
            return nil
        }
    }