danielCarlosCE

//
//  ContentSizePagingCollectionDelegate.swift
//  CardsCarousel
//
//  Created by Daniel Carlos Souza Carvalho on 2/20/21.
//

import UIKit

/// Horizontal paging for collections based on the content size

ArtFeel

//
//  CALayer+AnimationPlayback.swift
//  Created by Philip Vasilchenko on 4/27/18.
//

import UIKit

//  Pause animations of layer tree
//
//  Technical Q&A QA1673:

tclementdev

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

proxpero

// taken 2018-03-19 from wikipedia. https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

enum Iso3166_1a2: String {
    case af = "AF"
    case ax = "AX"
    case al = "AL"
    case dz = "DZ"
    case `as` = "AS"
    case ad = "AD"
    case ao = "AO"

steven2358

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

feix

#!/usr/bin/env python2
 
# lrdcq 
# usage python2 unwxapkg.py filename
 
import sys, os
import struct
 
class WxapkgFile(object):
  nameLen = 0

Azoy

Install Swift on Ubuntu

Requirements

1. Ubuntu 14.04, 16.04, or 16.10

Step 1 - Dependencies

1. Open up terminal
2. Install core deps: sudo apt-get install clang libicu-dev git

Step 1.1 - Ubuntu 14.04 Clang

cotkjaer

extension CGRect
{
    /** Creates a rectangle with the given center and dimensions
    - parameter center: The center of the new rectangle
    - parameter size: The dimensions of the new rectangle
     */
    init(center: CGPoint, size: CGSize)
    {
        self.init(x: center.x - size.width / 2, y: center.y - size.height / 2, width: size.width, height: size.height)

alskipp

// Create an `Observable` of Optional<Int>
let values: Observable<Int?> = [1, 2, .None, 3, .None, 4, 5].toObservable()


// Method 1: using a free function
// Requires passing the function to `flatMap`

func ignoreNil<A>(x: A?) -> Observable<A> {
  return x.map { Observable.just($0) } ?? Observable.empty()
}

steinwaywhw

• Use curl to get the JSON response for the latest release
• Use grep to find the line containing file URL
• Use cut and tr to extract the URL
• Use wget to download it

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \