krzyzanowskim

import Cocoa

// for-in
func checkForIn(array: [Int], dict: [Int: String]) {
    for num in array where dict[num] != nil {
        num
    }
}

checkForIn([1,2,3,4], dict: [1:"one", 2:"two"])

AliSoftware

// Allow to use generics even if not supported yet
#if __has_feature(objc_generics)
  #define NSArrayOf(x) NSArray<x>
  #define NSMutableArrayOf(x) NSMutableArray<x>
  #define NSDictionaryOf(x,y) NSDictionary<x, y>
  #define NSMutableDictionaryOf(x, y) NSMutableDictionary<x, y>
  #define NSSetOf(x) NSSet<x>
  #define NSMutableSetOf(x) NSMutableSet<x>
#else
  #define NSArrayOf(x) NSArray

jazzychad

//
//  ZZZTypewriterLabel.h
//
//  Created by Chad Etzel on 4/30/15.
//  Copyright (c) 2015 Chad Etzel, MIT License.
//
//
//    The MIT License (MIT)
//
//    Copyright (c) 2015 Chad Etzel

JeOam

Author: https://www.cyanhall.com/

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

calebd

import Foundation

/// An abstract class that makes building simple asynchronous operations easy.
/// Subclasses must implement `execute()` to perform any work and call
/// `finish()` when they are done. All `NSOperation` work will be handled
/// automatically.
open class AsynchronousOperation: Operation {

    // MARK: - Properties

irace

//  Copyright (c) 2012 Tumblr. All rights reserved.
//  License: Apache 2.0

// We're using an 'active' class instead of the default :active pseudo selector because we can add/remove it easily
var elementsWithActiveStateSelector = ['.tumblelog', '.control', '.audio-player', '.tag', 'a', '.video', 
                                       '.gif-container', '.external-image-placeholder'].join(',');

$('#content').on('touchstart', elementsWithActiveStateSelector, function() {
    var $el = $(this);

monkeydom

#!/bin/sh

SWIFT=$(/usr/bin/env xcrun -f swift)

SCRIPTPATH=$1
COMPILEDPATH="$SCRIPTPATH.o"

SDKPATH=$(/usr/bin/env xcrun --show-sdk-path --sdk macosx)

#compile if necessary

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






\

spoletto

/*
 * In practice, what I've found is that ALAssetPropertyDate, which is documented as the "asset creation time"
 * will return (always in UTC):
 *
 * (1) If taken from the native camera, a ms-precision time of when the photo was taken.
 * (2) If EXIF exists, EXIF time converted to UTC based on the timezone the device was in when
 *     the photo was saved to the camera roll. This is sec-precision.
 * (3) If EXIF does not exist, the time the photo was written into the camera roll. This is sec-precision.
 */
NSDate *timeTaken = [asset valueForProperty:ALAssetPropertyDate];

lisamelton

#!/bin/bash
#
# convert-video.sh
#
# Copyright (c) 2013-2014 Don Melton
#

about() {
    cat <<EOF
$program 2.0 of December 3, 2014