efremidze

class ButtonSubclass: UIButton {
    convenience init(title: String) {
        self.init()
        self.init(type: .system)
        self.setTitle(title, for: .normal)
    }
}

efremidze

extension UITableView {
    func reusableCell(style: UITableViewCellStyle, reuseIdentifier: String, configureBlock: ((UITableViewCell) -> Void)? = nil) -> UITableViewCell {
        if let cell = dequeueReusableCell(withIdentifier: reuseIdentifier) {
            configureBlock?(cell)
            return cell
        }
        return UITableViewCell(style: style, reuseIdentifier: reuseIdentifier)
    }
}

efremidze

let sessionManager: SessionManager = {
    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders
    let sessionManager = SessionManager(configuration: configuration)
    let oauthHandler = OAuth2Handler(accessToken: accessToken, refreshToken: refreshToken)
    sessionManager.adapter = oauthHandler
    sessionManager.retrier = oauthHandler
    return sessionManager
}()

efremidze

import Foundation

class Object<Type> {
    var value: Type! {
        didSet {
            print(value)
        }
    }
//    init(_ value: Type) {
//        self.value = value // didSet not called

efremidze

struct Comment {
    let text: String
    let date: Date
    
    static func make(_ text: String) -> Comment {
        return Comment(text: text, date: Date())
    }
}

efremidze

extension UIColor {
    convenience init(red: Int, green: Int, blue: Int) {
        self.init(red: CGFloat(red) / 255, green: CGFloat(green) / 255, blue: CGFloat(blue) / 255, alpha: 1)
    }
    class var red: UIColor { return UIColor(red: 255, green: 59, blue: 48) }
    class var orange: UIColor { return UIColor(red: 255, green: 149, blue: 0) }
    class var yellow: UIColor { return UIColor(red: 255, green: 204, blue: 0) }
    class var green: UIColor { return UIColor(red: 76, green: 217, blue: 100) }
    class var tealBlue: UIColor { return UIColor(red: 90, green: 200, blue: 250) }
    class var blue: UIColor { return UIColor(red: 0, green: 122, blue: 255) }

efremidze

precedencegroup OptionalAssignmentPrecedence {
    associativity: right
    lowerThan: AssignmentPrecedence
}
infix operator ?= : OptionalAssignmentPrecedence
public func ?=<T>(optional: inout T?, defaultValue: @autoclosure () -> T?) {
    if optional == nil {
        optional = defaultValue()
    }
}

efremidze

func +=<K, V>(left: inout [K : V]?, right: [K : V]?) {
    right?.forEach { left?[$0] = $1 }
}

func +<K, V>(left: [K : V]?, right: [K : V]?) -> [K : V]? {
    guard let left = left else { return right }
    guard let right = right else { return left }
    return left.reduce(right) { dict, pair in
        var dict = dict
        dict[pair.0] = pair.1

efremidze

extension UINavigationBar {
    
    var barColor: UIColor? {
        get { return self.backgroundView.backgroundColor }
        set { self.backgroundView.backgroundColor = newValue }
    }
    
    private var backgroundView: UIView {
        return self.subviews.filter { $0 is TransparentView }.first ?? {
            let statusBarHeight = UIApplication.shared.isStatusBarHidden ? 20 : UIApplication.shared.statusBarFrame.height

efremidze

class ResizingTableView: UITableView {
    
    private var heightConstraint: NSLayoutConstraint?
    
    override init(frame: CGRect, style: UITableViewStyle) {
        super.init(frame: frame, style: style)
        
        self.addObserver(self, forKeyPath: #keyPath(contentSize), options: .new, context: nil)
    }