fethica

class ImageLoader {

  private let cache = NSCache<NSString, NSData>()

  class func image(for url: URL, completionHandler: @escaping(_ image: UIImage?) -> ()) {

    DispatchQueue.global(qos: DispatchQoS.QoSClass.background).async {

      if let data = self.cache.object(forKey: url.absoluteString as NSString) {
        DispatchQueue.main.async { completionHandler(UIImage(data: data as Data)) }

fethica

func fetchContentLength(for url: URL, completionHandler: @escaping (_ contentLength: UInt64?) -> ()) {
    
  var request = URLRequest(url: url)
  request.httpMethod = "HEAD"
    
  let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
    guard error == nil,
      let response = response as? HTTPURLResponse,
      let contentLength = response.allHeaderFields["Content-Length"] as? String else {
        completionHandler(nil)

fethica

func isRelative(url: URL) -> Bool {
  guard let regex = try? NSRegularExpression(pattern: "^(?:[a-z]+:)?//", options: .caseInsensitive) else { return false }
  return regex.firstMatch(in: url.absoluteString, options: [], range: NSRange(location: 0, length: url.absoluteString.count)) == nil
}

let url = URL(string: "https://s3.amazonaws.com/x265.org/video/Tears_400_x265.mp4")!

isRelative(url: url) // false

fethica

struct SwitchToMainThread {
  static func with(_ block: @escaping (() -> ())) {
    guard !Thread.isMainThread else { block(); return }
    DispatchQueue.main.async { SwitchToMainThread.with(block) }
  }
}

SwitchToMainThread.with { 
  // Do UI stuff
}

fethica

public struct Units {
  
  public let bytes: Int64
  
  public var kilobytes: Double {
    return Double(bytes) / 1_024
  }
  
  public var megabytes: Double {
    return kilobytes / 1_024

fethica

extension UIViewController {
    
    func embed(_ child: UIViewController, animated: Bool = false) {
        let duration = animated ? 0.3 : 0.0
        
        child.view.alpha = 0
        child.willMove(toParent: self)
        self.addChild(child)
        self.view.addSubview(child.view)
        

fethica

@interface myViewController: UIViewController <CLLocationManagerDelegate>
    CLLocationManager *locationManager;
    CLLocation *currentLocation;
@end

fethica

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>items</key>
	<array>
		<dict>
			<key>assets</key>
			<array>
				<dict>

fethica

/*

Distributed under The MIT License:
http://opensource.org/licenses/mit-license.php

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to

fethica

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --allow-file-access-from-files