Anatoli-Petrosyants

lazy var v1:UIView = {
        let v = UIView()
        v.backgroundColor = .blueColor()
        return v
}()
    
lazy var v2:UIView = {
        let v = UIView()
        v.backgroundColor = .blueColor()
        return v

Anatoli-Petrosyants

    private func performWithoutAnimation(closureToPerform: () -> Void) {
        UIView.setAnimationsEnabled(false)
        closureToPerform()
        UIView.setAnimationsEnabled(true)
    }

Anatoli-Petrosyants

extension UIView {
    
    var snapshot: UIImage? {
        UIGraphicsBeginImageContext(self.frame.size)
        guard let context = UIGraphicsGetCurrentContext() else {
            return nil
        }
        layer.render(in: context)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

Anatoli-Petrosyants

static func mapValuesToQueryItems(values: [String:Any?]) -> [URLQueryItem]? {
        let returnValues = values
            .filter { $0.1 != nil }
            .map { (item: (_key: String, _value: Any?)) -> [URLQueryItem] in
                if let value = item._value as? Array<String> {
                    return value.map { (v) -> URLQueryItem in
                        URLQueryItem(
                            name: item._key,
                            value: v
                        )

Anatoli-Petrosyants

extension String {
    func height(withConstrainedWidth width: CGFloat, font: UIFont) -> CGFloat {
        let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
        let boundingBox = self.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: font], context: nil)
        
        return ceil(boundingBox.height)
    }
    
    func width(withConstraintedHeight height: CGFloat, font: UIFont) -> CGFloat {
        let constraintRect = CGSize(width: .greatestFiniteMagnitude, height: height)

Anatoli-Petrosyants

public extension UIColor {
    convenience init(hex: Int, alpha: Double = 1.0) {
        let r = CGFloat((hex & 0xFF0000) >> 16) / 255.0
        let g = CGFloat((hex & 0x00FF00) >> 8) / 255.0
        let b = CGFloat(hex & 0x0000FF) / 255.0
        self.init(red: r, green: g, blue: b, alpha: CGFloat(alpha))
    }
}

Anatoli-Petrosyants

private static var dateFormatter: DateFormatter = {
    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = .medium
    return dateFormatter
}()

Anatoli-Petrosyants

extension Date {
    var millisecondsSince1970:Int {
        return Int((self.timeIntervalSince1970 * 1000.0).rounded())
    }

    init(milliseconds:Int) {
        self = Date(timeIntervalSince1970: TimeInterval(milliseconds / 1000))
    }
}

Anatoli-Petrosyants

protocol StringType {
    var isEmpty: Bool { get }
}

extension String : StringType { }

extension Optional where Wrapped: StringType {
    var isNullOrEmpty: Bool {
        return self?.isEmpty ?? true
    }

Anatoli-Petrosyants

self.subviews.forEach({ $0.removeFromSuperview() })