eternalstorms

UI- and App Frameworks Evangelist - Jake Behrens, [email protected], twitter: @Behrens
	- What's new in Cocoa
	- Accessibility in iOS
	- Building User Interfaces for iOS 7
	- Getting Started with UIKit Dynamics
	- What's new in Cocoa Touch
	- What's New With Multitasking
	- Best Practices for Cocoa Animation
	- Improving Power Efficiency with App Nap
	- Introducing Text Kit

mattdonnelly

//
//  UIImage+vImageScaling.h
//  UIImage+vImageScaling
//
//  Created by Matt Donnelly on 03/07/2013.
//  Copyright (c) 2013 Matt Donnelly. All rights reserved.
//

#import <UIKit/UIKit.h>

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

0thernet

Working with Cocoa

Implicitly Unwrapped Optionals

• A value of class type in Swift is never nil
  • var fileModificationDate: NSDate!
• Objective-C does not have a notion of a "never-nil" pointer
• ! is an implicitly unwrapped optional
  • can be tested explicitly for nil
  • can directly access properties/methods of the underlying value
  • can be implicitly converted to its underlying value

kristopherjohnson

/// Find the index of the first element of a sequence that satisfies a predicate
///
/// :param: sequence A sequence to be searched
/// :param: predicate A function applied to each element in turn until it returns true
///
/// :returns: Zero-based index of first element that satisfies the predicate, or nil if no such element was found
public func findIndex<S: SequenceType>(sequence: S, predicate: (S.Generator.Element) -> Bool) -> Int? {
    for (index, element) in enumerate(sequence) {
        if predicate(element) {
            return index

andymatuschak

//
//  MultiDirectionAdjudicatingScrollView.swift
//  Khan Academy
//
//  Created by Andy Matuschak on 12/16/14.
//  Copyright (c) 2014 Khan Academy. All rights reserved.
//

import UIKit
import UIKit.UIGestureRecognizerSubclass

bkaradzic

Orthodox C++

What is Orthodox C++?

Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.

Why not Modern C++?

danieleggert

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

1. Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
2. Create or import a key -- see below for https://keybase.io
3. Run gpg --list-secret-keys and look for sec, use the key ID for the next step
4. Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

frankrausch

import Foundation

extension String {
    
    func hyphenated(languageCode: String) -> String {
        let locale = Locale(identifier: languageCode)
        return self.hyphenated(locale: locale)
    }
    
    func hyphenated(locale: Locale) -> String {

smileyborg

// UICollectionView Objective-C example

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
        
    NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] firstObject];
    if (selectedIndexPath != nil) {
        id<UIViewControllerTransitionCoordinator> coordinator = self.transitionCoordinator;
        if (coordinator != nil) {
            [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {