pesterhazy

So you want to write a sync system for a web app with offline and realtime support? Good luck. You might find the following resources useful.

Overview articles

• Database in a browser, a spec (Stepan Parunashvili)

  What problem are we trying to solve with a sync system?

• The web of tomorrow (Nikita Prokopov)

christianselig

extension Locale {
    /// Returns an SF Symbol currency image that match's the device's current locale, for instance dollar in North America, Indian rupee in India, etc.
    func currencySFSymbol(filled: Bool, withConfiguration configuration: UIImage.Configuration? = nil) -> UIImage {
        // Default currency symbol will be the Animal Crossing Leaf coin 􁂬 to remain impartial to any specific country
        let defaultSymbol = UIImage(systemName: "leaf.circle\(filled ? ".fill" : "")")!
        
        guard let currencySymbolName = currencySymbolNameForSFSymbols() else { return defaultSymbol }
        
        let systemName = "\(currencySymbolName).circle\(filled ? ".fill" : "")"
        return UIImage(systemName: systemName, withConfiguration: configuration) ?? defaultSymbol

khanlou

extension Sequence {
    func eachPair() -> Zip2Sequence<Self, DropFirstSequence<Self>> {
        return zip(self, self.dropFirst())
    }
}

extension Collection {

    func indexed() -> [(index: Index, element: Element)] {
        return zip(indices, self).map({ (index: $0, element: $1) })

Sorix

//  Created by Vasily Ulianov on 09.02.17, updated in 2019.
//  License: MIT

import Foundation

/// Subclass of `Operation` that adds support of asynchronous operations.
/// 1. Call `super.main()` when override `main` method.
/// 2. When operation is finished or cancelled set `state = .finished` or `finish()`
open class AsynchronousOperation: Operation {
    public override var isAsynchronous: Bool {

bobspryn

UIContentSizeCategoryExtraSmall
     FontStyle: UICTFontTextStyleBody
         Point size 14.000000
         Family Name .AppleSystemUIBody
     FontStyle: UICTFontTextStyleHeadline
         Point size 14.000000
         Family Name .AppleSystemUIHeadline
         Bold
     FontStyle: UICTFontTextStyleSubhead
         Point size 12.000000

TonnyXu

// UIApplication.h		
UIApplicationDidEnterBackgroundNotification       __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);
UIApplicationWillEnterForegroundNotification      __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);
UIApplicationDidFinishLaunchingNotification;
UIApplicationDidBecomeActiveNotification;
UIApplicationWillResignActiveNotification;
UIApplicationDidReceiveMemoryWarningNotification;
UIApplicationWillTerminateNotification;
UIApplicationSignificantTimeChangeNotification;
UIApplicationWillChangeStatusBarOrientationNotification; // userInfo contains NSNumber with new orientation