alexj70

0x5063Ea9d67FB408faff44CA1dd8DDDd0FfDEd269

alexj70

UI Testing

★ Get Application

let app = XCUIApplication()

★ accessibilityIdentifier by code

alexj70

DispatchOnce

Swift3.0

public extension DispatchQueue {
    private static var _onceTracker = [String]()
    
    public class func once(file: String = #file, function: String = #function, line: Int = #line, block:(Void)->Void) {
        let token = file + ":" + function + ":" + String(line)
 once(token: token, block: block)

alexj70

Method Swizzling

★　Replacement of viewWillAppear method

private let swizzling: (UIViewController.Type) -> () = { viewController in
    
    let originalSelector = #selector(viewController.viewWillAppear(_:))
    let swizzledSelector = #selector(viewController.proj_viewWillAppear(animated:))

alexj70

String Optional Extension

Swift3.1

extension Optional where Wrapped == String {
var isNilOrEmpty: Bool {
        return ((self as? String) ?? "").isEmpty
    }
}

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Singleton

class Singleton {
    static let sharedInstance = Singleton()
    private override init() {}
}

alexj70

Resource

import Foundation
struct Resource {
    enum HTML: String, ResourceConvertible, Iteratable {
        case rightOfWithdrawal = "RightOfWithdrawal"
        case privatePolicy = "PrivatePolicy"
        case termsAndConditions = "TermsAndConditions"
    }
}

alexj70

Enum iteration

protocol Iteratable {}
extension RawRepresentable where Self: RawRepresentable {
    static func iterateEnum<T: Hashable>(_: T.Type) -> AnyIterator<T> {
        var i = 0
        return AnyIterator {
            let next = withUnsafePointer(to: &i) {
                $0.withMemoryRebound(to: T.self, capacity: 1) { $0.pointee }
 }

alexj70

print("Movies by C. Columbus only:")
for case let Media.movie(title, director, year) in mediaList where director == "Chris Columbus" {
  print(" - \(title) (\(year))")
}

/* Output:
Movies by C. Columbus only:
 - Harry Potter and the Philosopher's Stone (2001)
 - Harry Potter and the Chamber of Secrets (2002)
*/

alexj70

enum Media {
  case book(title: String, author: String, year: Int)
  case movie(title: String, director: String, year: Int)
  case website(urlString: String)
}

let mediaList: [Media] = [
  .book(title: "Harry Potter and the Philosopher's Stone", author: "J.K. Rowling", year: 1997),
  .movie(title: "Harry Potter and the Philosopher's Stone", director: "Chris Columbus", year: 2001),
  .book(title: "Harry Potter and the Chamber of Secrets", author: "J.K. Rowling", year: 1999),