SixBe

import Foundation

@objc public protocol DataSourceProtocol: AnyObject {

  @objc func runDataSourceRequest(_ dataSourceRequest: DataSourceRequest) -> AnyObject?
}

@objc public protocol DataSourceRequest {

  var responseModel: AnyClass { get }

SixBe

public class Ball: UIView {
    
    public init(radius: CGFloat) {
        super.init(frame: CGRect(origin: .zero, size: CGSize(width: radius * 2, height: radius * 2)))

        self.layer.cornerRadius = radius
        self.backgroundColor = .red()
        
        let indicator = UIView(frame: .zero)
        self.addSubview(indicator)

SixBe

let timing = UICubicTimingParameters(animationCurve: .easeInOut)
let animator = UIViewPropertyAnimator(duration: 6.0, timingParameters: timing)

// ball is a UIView
let rotationAnimation: ()->Void = {
    ball.transform = ball.transform.rotate(CGFloat.pi)
}
for _ in 1...6 {
    animator.addAnimations(rotationAnimation)
}

SixBe

extension NSFetchedResultsController {
    private func processChangesWithWillAccessValueForKey(notification: NSNotification) {
        guard let _ = self.fetchRequest.predicate, _ = self.fetchRequest.entity else {
            return
        }
        var matchingObjectIDs = self.insertedOrUpdatedObjectIDsMatchingFetchRequestInNotification(notification)
        self.managedObjectContext.performBlock({
            let registeredObjectIDs = self.managedObjectContext.registeredObjects.map{$0.objectID}
            matchingObjectIDs.subtractInPlace(registeredObjectIDs)
            for matchingObjectID in matchingObjectIDs {

SixBe

extension NSFetchedResultsController {
    func registerForCommitsToContext(context: NSManagedObjectContext, notificationCenter: NSNotificationCenter? = nil) -> NSObjectProtocol? {
        guard self.managedObjectContext != context else {
            return nil
        }
        let center = notificationCenter ?? NSNotificationCenter.defaultCenter()
        return  center.addObserverForName(NSManagedObjectContextDidSaveNotification, object: context, queue: nil) { [weak self] notification in
            guard let strongSelf = self else {
                return
            }

SixBe

public extension NSManagedObjectContext {
    
    func addContextDidSaveNotificationObserver(center: NSNotificationCenter, handler: NSNotification -> ()) -> NSObjectProtocol {
        return center.addObserverForName(NSManagedObjectContextDidSaveNotification, object: self, queue: nil) { notification in
            handler(notification)
        }
    }
    
    func performMergeChangesFromContextDidSaveNotification(notification: NSNotification) {
        self.performBlock {