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

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

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

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>

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