aybekckaya

extension NSObject {
    var className: String {
        return String(describing: type(of: self))
    }
    
    class var className: String {
        return String(describing: self)
    }
}

aybekckaya

extension UIViewController {
    func configureChildViewController(childController: UIViewController, onView: UIView?) {
        var holderView = self.view
        if let onView = onView {
            holderView = onView
        }
        addChildViewController(childController)
        holderView?.addSubview(childController.view)
        constrainViewEqual(holderView: holderView!, view: childController.view)
        childController.didMove(toParentViewController: self)

aybekckaya

extension String {
   
    static var documentsPath:String {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentsDirectory = paths[0]
        return documentsDirectory.path
    }
    
    var filePathAtDocumentsDirectory:String {
        let docPath = String.documentsPath

aybekckaya

 guard let jsonDct:[String:Any] = readJsonFile() , let arrCategoriesDct:[[String:Any]] = jsonDct["categories"] as? [[String:Any]]  else { return }
        let categories:[Category] = arrCategoriesDct.compactMap { dct -> Category? in
            return Category(dct: dct)
        }
        
        var completedCount:Int = 0
        categories.forEach { category in
            self.asyncTask(imageURL: category.thumbnailImage, completion: { image in
               completedCount += 1
                if completedCount == categories.count {

aybekckaya

let group:DispatchGroup = DispatchGroup()
group.enter() // entryCount = 1 

iAmLongRunningFunc {
 group.leave() // entryCount = 0    
}
        
group.enter() // entryCount = 1
iAmLongRunningFunc {          
 group.leave() // entryCount = 0

aybekckaya

import UIKit

class ImageKit: NSObject {
    
    private let group:DispatchGroup = DispatchGroup()
    
    override init() {
        super.init()
    }
    

aybekckaya

import UIKit

class BannerView: UIView {
   
   override init(frame: CGRect) {
        super.init(frame: frame)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")

aybekckaya

import UIKit

class BannerView: UIView {
   
   private let scrollView:UIScrollView = {
        let sc = UIScrollView(frame: .zero)
        sc.translatesAutoresizingMaskIntoConstraints = false
        sc.isPagingEnabled = true
        return sc
    }()

aybekckaya

// ViewController.swift

bannerView = BannerView(frame: CGRect(x: 0, y: 64, width: self.view.frame.size.width, height: 200))
self.view.addSubview(bannerView)

bannerView.reloadData(numberOfItems: 5) { (bannerView, index) -> (UIView) in
        let view = UIView()
        view.backgroundColor = UIColor.red
        return view
}

aybekckaya

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        let currentPage:Int = Int(scrollView.contentOffset.x / scrollView.frame.size.width)
        if currentPage == 0 {
            self.scrollView.contentOffset = CGPoint(x: scrollView.frame.size.width * CGFloat(numberOfItems), y: scrollView.contentOffset.y)
        }
        else if currentPage == numberOfItems {
            self.scrollView.contentOffset = CGPoint(x: 0, y: scrollView.contentOffset.y)
        }
  }