chriswebb09

import Foundation

extension NSError {
    static func generalParsingError(domain: String) -> Error {
        return NSError(domain: domain, code: 400, userInfo: [NSLocalizedDescriptionKey : NSLocalizedString("Error retrieving data", comment: "General Parsing Error Description")])
    }
}

chriswebb09

extension UIViewController {
    func dismiss() {
        view.endEditing(true)
        dismiss(animated: true, completion: nil)
    }
}

chriswebb09

extension String {
    
    // String extension check that itself for valid email pattern and returns boolean
    
    func isValidEmail() -> Bool {
        let emailRegEx = "^(?:(?:(?:(?: )*(?:(?:(?:\\t| )*\\r\\n)?(?:\\t| )+))+(?: )*)|(?: )+)?(?:(?:(?:[-A-Za-z0-9!#$%&’*+/=?^_'{|}~]+(?:\\.[-A-Za-z0-9!#$%&’*+/=?^_'{|}~]+)*)|(?:\"(?:(?:(?:(?: )*(?:(?:[!#-Z^-~]|\\[|\\])|(?:\\\\(?:\\t|[ -~]))))+(?: )*)|(?: )+)\"))(?:@)(?:(?:(?:[A-Za-z0-9](?:[-A-Za-z0-9]{0,61}[A-Za-z0-9])?)(?:\\.[A-Za-z0-9](?:[-A-Za-z0-9]{0,61}[A-Za-z0-9])?)*)|(?:\\[(?:(?:(?:(?:(?:[0-9]|(?:[1-9][0-9])|(?:1[0-9][0-9])|(?:2[0-4][0-9])|(?:25[0-5]))\\.){3}(?:[0-9]|(?:[1-9][0-9])|(?:1[0-9][0-9])|(?:2[0-4][0-9])|(?:25[0-5]))))|(?:(?:(?: )*[!-Z^-~])*(?: )*)|(?:[Vv][0-9A-Fa-f]+\\.[-A-Za-z0-9._~!$&'()*+,;=:]+))\\])))(?:(?:(?:(?: )*(?:(?:(?:\\t| )*\\r\\n)?(?:\\t| )+))+(?: )*)|(?: )+)?$"
        let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        let result = emailTest.evaluate(with: self)
        return result
    }

chriswebb09

extension UIImage {
    
    enum Quality: CGFloat {
        case worst  = 0
        case low     = 0.25
        case medium  = 0.5
        case high    = 0.75
        case best  = 1
    }
  

chriswebb09

import UIKit

extension UICollectionViewCell {
    static var identifier: String { return String(describing: self) }
}

chriswebb09

import UIKit

fileprivate let imageCache = NSCache<NSString, UIImage>()

extension UIImageView {
    
    func downloadImage(url: URL) {
        if let cachedImage = imageCache.object(forKey: url.absoluteString as NSString) {
            self.image = cachedImage
            return

chriswebb09

class ViewController: UIViewController {
    
  let imageViewOne = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        imageViewOne.frame = UIScreen.main.bounds
        view.addSubview(imageViewOne)
        setImage()
    }

chriswebb09

extension ImageDownloadProtocol {
    func downloadImage(from url: URL, completion: @escaping (UIImage?) -> Void) {
        let session = URLSession(configuration: .default)
        DispatchQueue.global(qos: .background).async {
            print("In background")
            session.dataTask(with: URLRequest(url: url)) { data, response, error in
                if error != nil {
                    print(error?.localizedDescription ?? "Unknown error")
                }
                if let data = data, let image = UIImage(data: data) {

chriswebb09

protocol ImageDownloadProtocol {
    func downloadImage(from url: URL, completion: @escaping (UIImage?) -> Void)
}

chriswebb09

 func testDataStore() {
 
      // Setup 
      // Run test 
      
        waitForExpectations(timeout: 4) { error in
            if let error = error {
                XCTFail("waitForExpectationsWithTimeout error: \(error)")
            }
        }