novinfard

protocol PLAnimatableBorder {
    func animateBorderWidth(toValue: CGFloat, duration: Double)
}

extension PLAnimatableBorder where Self: UIView {
    /// animate the border width
    func animateBorderWidth(toValue: CGFloat, duration: Double) {
        let animation: CABasicAnimation = CABasicAnimation(keyPath: "borderWidth")
        animation.fromValue = layer.borderWidth
        animation.toValue = toValue

novinfard

                        debug   release   release
function                -Onone  -O       -Ounchecked
assert()                YES     NO        NO
assertionFailure()      YES     NO        NO**
precondition()          YES     YES       NO
preconditionFailure()   YES     YES       YES**
fatalError()*           YES     YES       YES

– assert: checking your own code for internal errors
– precondition: for checking that your clients have given you valid arguments.

novinfard

private let gradientLayer = CAGradientLayer()

override func layoutSubviews() {
    super.layoutSubviews()
    super.layoutIfNeeded()

    if let viewBounds = self.gradientView?.bounds {
        self.gradientLayer.frame = viewBounds
    }
}

novinfard

let spacing: CGFloat = 10 // the amount of spacing to appear between image and title
self.button?.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: spacing)
self.button?.titleEdgeInsets = UIEdgeInsets(top: 0, left: spacing, bottom: 0, right: 0)

novinfard

xcrun simctl openurl booted "PROTOCOL://URLPATH/"

novinfard

guard let navBar = self.navigationController else { return }

if #available(iOS 11.0, *) {
    navBar.navigationBar.prefersLargeTitles = true
    navBar.navigationItem.largeTitleDisplayMode = .always

    navBar.navigationBar.largeTitleTextAttributes = [
        NSAttributedStringKey.foregroundColor: UIColor.white,
        NSAttributedStringKey.font: UIFont.systemFont(ofSize: 36)]

novinfard

// Inside the app (SQLite)
lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "CoreDataUnitTesting")
  
    container.loadPersistentStores { (description, error) in
        if let error = error {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    }
    return container

novinfard

func performNetworkRequest(url: String,
                           completion: @escaping (Data?, Error?) -> Void) {
	// create a url
    let requestUrl = URL(string: url)
    
    // create a data task
    let task = URLSession.shared.dataTask(with: requestUrl!) { (data, response, error) in
        completion(data, error)
    }
    task.resume()

novinfard

let baseUrl = "https://jsonplaceholder.typicode.com/"
let endpoints = ["posts", "comments", "albums", "photos", "todos", "users"]

novinfard

let group = DispatchGroup()
endpoints.forEach { endpoint in
    group.enter()
    performNetworkRequest(url: baseUrl + endpoint) { data, error in
        print("Task \(endpoint) is done")
        group.leave()
    }
}

// notify the main thread when all task are completed