alexnikol

CATransaction.begin()  //Start of animation transaction

CATransaction.setCompletionBlock { //Transaction is Ready
   print("READY")
}

heightConstraint.constant = 80.0

UIView.animate(withDuration: 2.0) { // UIView type of animation
   view.layoutIfNeeded()

alexnikol

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Creation of View
        let square = UIView(frame: CGRect(x: 20, y: 70, width: 370, height: 200))
        square.layer.borderColor = UIColor.green.cgColor
        square.layer.borderWidth = 2.0
        square.layer.cornerRadius = 5
        square.backgroundColor = UIColor.systemPink

alexnikol

let rect = CGRect(x: 40, y: 40, width: 300, height: 250)
let view = UIView(frame: rect)
view.backgroundColor = UIColor.systemPink

//Add Shadow
view.layer.shadowColor = UIColor.red.cgColor
view.layer.shadowOffset = CGSize(width: 20, height: 20)
view.layer.shadowRadius = 10.0
view.layer.shadowOpacity = 0.7

alexnikol

// MARK: Creation of sublayer1
let sublayer1 = CALayer()
sublayer1.frame = CGRect(x: 20, y: 20, width: 30, height: 30)
sublayer1.backgroundColor = UIColor.red.cgColor

// MARK: Creation of sublayer2
let sublayer2 = CALayer()
sublayer2.frame = CGRect(x: 80, y: 80, width: 40, height: 40)
sublayer2.backgroundColor = UIColor.green.cgColor

alexnikol

//We can change preferredStyle: .actionSheet
let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)

//Add Cancel Action
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler:  nil)

//Add Default Action
alert.addAction(UIAlertAction(title: "Default", style: .default, handler: { (action) in
    print("Default action")
}))

alexnikol

func openAlert() {
  
  //UITextField completionHandler. Here we can customize and add event handlers to field
  alert.addTextField { (field) in
      field.placeholder = "Pet Name" //add placeholder
      field.addTarget(self, action: #selector(self.editingChanged), for: .editingChanged) //add editingChanged handler
  }
  
  self.present(alert, animated: true, completion: nil)
  

alexnikol

//We can change preferredStyle: .actionSheet
let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)

//Add Cancel Action
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler:  nil))

//Add Default Action
alert.addAction(UIAlertAction(title: "Default", style: .default, handler:  { action in
    print("Default button did tap")
}))

alexnikol

func runReportFlow() {
    
    func getWeekReportBody() {} //First Nested Function
    
    func getMonthReportBody() {} //Second Nested Function
    
    if isSomeConditionTrue {
      
        getWeekReportBody()
      

alexnikol

class Factory {
    
    var car: Car
    
    init(car: Car) {
        self.car = car
    }
    
    deinit {
        print("Factory model deallocated")

alexnikol

class HalfCircleIndicator: UIView {

    private var progressLayer: CAShapeLayer!
    private var fullSize: CGSize!
    private var grayCircleSize: CGSize!
    private var innerGrayCircleSize: CGSize!
    private var greenCircleSize: CGSize!
    var value: CGFloat = 0.0
    var isInnerCircleExist: Bool