hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

malatx

<?php
// This is sample code to draw some of the charts I blogged about here:
// https://medium.com/ios-os-x-development/keeping-your-wits-as-an-indie-app-developer-3b5b14428e1f
// 
// A few disclaimers:
//   1. This assumes you have at least 30 days of sales data in order to draw the Trailing 7 Days Chart
//   2. This assumes you have over 52 consecutive weeks of data in order to draw the Trailing Year Chart
//   3. I don't really know PHP. Everything this does, I had to look it up while writing it. If you actually know PHP, sorry. There are surely better ways. 
//
// the results of this PHP script is intended to be drawn using the Flot library.

mackuba

Here's my own list of the interesting stuff announced during this year's WWDC, collected from the keynotes, various Apple docs, blog posts and tweets.

If you're planning to watch the videos, I really recommend this Mac app that helps you download and watch them: https://github.com/insidegui/WWDC.

OS X El Capitan

http://www.apple.com/osx/elcapitan-preview/

• split view - two apps side by side on full screen

erikolsson

extension SharedModel {

  class func decode(data: Data) -> SharedModel? {
    NSKeyedUnarchiver.setClass(SharedModel.self, forClassName: "SharedModel")
    return NSKeyedUnarchiver.unarchiveObject(with: data) as? SharedModel
  }

  func encode() -> Data {
    NSKeyedArchiver.setClassName("SharedModel", for: SharedModel.self)
    return NSKeyedArchiver.archivedData(withRootObject: self)

hcn1519

Create GradientLayer on your tableViewCell(collectionViewCell)

1. Create CAGradientLayer Instance on your tableViewCell

class MyCell: UITableViewCell {
    let gradientLayer = CAGradientLayer()
}

1hakr

proxy_cache_path /tmp/cacheapi levels=1:2 keys_zone=microcacheapi:100m max_size=1g inactive=1d use_temp_path=off;
server {
    listen 443 ssl http2 default_server;
    listen [::]:443 ssl http2 default_server;
    server_name example.com;

    location /api/ {
        # Rate Limiting
        limit_req zone=reqlimit burst=20; # Max burst of request

erikolsson

import UIKit

class PixelWidthConstraint: NSLayoutConstraint {

  override func awakeFromNib() {
    super.awakeFromNib()
    constant = 1.0 / UIScreen.main.scale
  }

}

MojtabaHs

// MARK: - Wrapper
@propertyWrapper
struct SomeKindOfBool: Decodable {
    var wrappedValue: Bool

    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let stringifiedValue = try? container.decode(String.self) {
            switch stringifiedValue.lowercased() {
            case "false", "no",  "0", "n", "f": wrappedValue = false