PaulTaykalo

protocol Updateable {
    func updated(block: (inout Self) -> ()) -> Self
}

extension Updateable {
    func updated(block: (inout Self) -> ()) -> Self  {
        var item = self
        block(&item)
        return item
    }

iThinker

class Logger {
    
    static var defaultLogger = Logger()
    
    func log(_ message: String) {
        print(message)
    }
    
}

romanmiller

extension CGSize {
// get scale of image size with max dimention
    public func scale(max: CGFloat) -> CGFloat {
        if width > height{
            if width > max {
                return max / width
            }
        } else {
            if height > max {
                return max / height

ilyapuchka

// The issue with sectionHeadersPinToVisibleBounds and sectionFootersPinToVisibleBounds is that they do not pin 
// first header and last footer when bouncing. This layout subclass fixes that.

class StickyLayout: UICollectionViewFlowLayout {
    
    override init() {
        super.init()
        self.sectionFootersPinToVisibleBounds = true
        self.sectionHeadersPinToVisibleBounds = true
    }

romanmiller

// from: size that button start animated; duration: time for animation;   
 func animateSpring(from: CGFloat,duration: TimeInterval) {
        
        let scale = from / self.bounds.height
        self.transform = CGAffineTransform(scaleX: scale, y: scale)
        
        UIView.animate(withDuration: duration,
                       delay: 0,
                       usingSpringWithDamping: 0.6,
                       initialSpringVelocity: 0.4,