msewell

extension String {
    private static let blockElements = (9600...9631)
        .compactMap { Unicode.Scalar($0) }
        .map { Character($0) }
    
    static func blocks(_ length: Int = 8) -> String {
        let choices =  (1...length)
            .map { _ in String.blockElements.randomElement()! }
        
        return String(choices)

msewell

extension UIControl {
    private class ClosureSleeve {
        let closure: () -> Void
        
        init(attachTo attachee: AnyObject, closure: @escaping () -> Void) {
            self.closure = closure
            objc_setAssociatedObject(attachee, "\(Int.random())", self, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
        
        @objc

msewell

/* The SegueHandlerType pattern, as seen on [1, 2], adapted for the changed Swift 3 syntax.

 [1] https://developer.apple.com/library/content/samplecode/Lister/Listings/Lister_SegueHandlerType_swift.html
 [2] https://www.natashatherobot.com/protocol-oriented-segue-identifiers-swift/
 */

protocol SegueHandlerType {

    // `typealias` has been changed to `associatedtype` for Protocols in Swift 3.
    associatedtype SegueIdentifier: RawRepresentable