nalexn

// Copyright © 2019 Alexey Naumov. MIT License

import Combine

typealias CancelBag = Set<AnyCancellable>

extension CancelBag {
    mutating func collect(@Builder _ cancellables: () -> [AnyCancellable]) {
        formUnion(cancellables())
    }

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)

katiesmillie

    
    func imageByAddingBorder(width: CGFloat, color: UIColor) -> UIImage? {
        UIGraphicsBeginImageContext(self.size)
        let imageRect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
        self.draw(in: imageRect)
        
        let context = UIGraphicsGetCurrentContext()
        let borderRect = imageRect.insetBy(dx: width / 2, dy: width / 2)
        
        context?.setStrokeColor(color.cgColor)

crisbit

let start = Date()
print("Elapsed time: \(start.timeIntervalSinceNow) seconds")

hujunfeng

What's the difference between UUID, GUID and UDID?

• UUID (Universally Unique Identifier): A sequence of 128 bits that can guarantee uniqueness across space and time, defined by [RFC 4122][rfc4122].

• GUID (Globally Unique Identifier): Microsoft's implementation of the UUID specification; often used interchangeably with UUID.

• UDID _(Unique Device Identifier)): A sequence of 40 hexadecimal characters that uniquely identify an iOS device (the device's Social Security Number, if you will). This value can be retrieved through iTunes, or found using UIDevice -uniqueIdentifier. Derived from hardware details like MAC address.

Is UDID deprecated?