Skip to content

Instantly share code, notes, and snippets.

@jaanus
jaanus / gist:7e14b31f7f445435aadac09d24397da8
Last active September 30, 2025 09:19
How to cleanly make swift-snapshot-testing run correctly in Xcode Cloud. You need to bundle the snapshots and resources into your test bundles (xctest), and then use this kind of code to instruct snapshot-testing to pick them up from the test bundle if present.
#if os(iOS)
import SnapshotTesting
import SwiftUI
import XCTest
public extension XCTestCase {
/// Test the layout of a full-screen SwiftUI view.
///
/// Currently, this is hardcoded to logical width and height of iPhone 14 Pro screen. It assumes that tests are ran only on iPhone 14 Pro simulator,
extension UIResponder {
struct ResponderIterator: IteratorProtocol {
private var responder: UIResponder?
init(_ responder: UIResponder) { self.responder = responder }
mutating func next() -> UIResponder? {
responder = responder?.next
return responder
}
}
@cellularmitosis
cellularmitosis / EmojiPointersDemo.swift
Created August 15, 2018 18:11
Representing pointer values as emoji can be useful for "visually" debugging certain issues, like cell reuse, etc.
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let window = UIWindow(frame: UIScreen.main.bounds)
@swalkinshaw
swalkinshaw / tutorial.md
Last active October 24, 2025 14:52
Designing a GraphQL API
@tclementdev
tclementdev / libdispatch-efficiency-tips.md
Last active November 10, 2025 03:11
Making efficient use of the libdispatch (GCD)

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

  • You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

  • Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

@k06a
k06a / MLWAsyncAVPlayer.h
Last active September 7, 2023 11:51
Awesome optimized AVPlayer for smooth scrolling AVPlayerLayer inside UICollectionView/UITableView (tested on iOS10+)
#import <AVFoundation/AVFoundation.h>
@interface MLWAsyncAVPlayer : AVPlayer
@end
@chourobin
chourobin / 0-bridging-react-native-cheatsheet.md
Last active August 28, 2025 08:25
React Native Bridging Cheatsheet
@kiennt
kiennt / model_user.ex
Created December 20, 2016 03:54
Absinthe authorization example
defimpl Kipatest.Can, for: Kipatest.User do
use Kipatest.Web, :model
def can?(%User{} = subject, :owner, %User{} = user) do
user.id == subject.id
end
end
@chengyin
chengyin / linkedout.js
Last active July 11, 2021 15:23
Unsubscribe all LinkedIn email in "one click". For an easier to use version, you can check out the bookmarklet: http://chengyin.github.io/linkedin-unsubscribed/
// 1. Go to page https://www.linkedin.com/settings/email-frequency
// 2. You may need to login
// 3. Open JS console
// ([How to?](http://webmasters.stackexchange.com/questions/8525/how-to-open-the-javascript-console-in-different-browsers))
// 4. Copy the following code in and execute
// 5. No more emails
//
// Bookmarklet version:
// http://chengyin.github.io/linkedin-unsubscribed/
@dypsilon
dypsilon / frontendDevlopmentBookmarks.md
Last active November 16, 2025 11:36
A badass list of frontend development resources I collected over time.