harlanhaskins

import Foundation

/// `StringScanner` is a fast scanner for Strings and String-like objects.
/// It's used to extract structured bits from unstructured strings, while
/// avoiding making extra copies of string bits until absolutely necessary.
/// You can build Scanners over Substrings, allowing you to scan
/// parts of strings and use smaller, more specialized scanners to extract bits
/// of that String without needing to reuse another scanner.
public struct StringScanner<Input: StringProtocol> {
  let input: Input

vinhnx

Centered Paging with Preview Cells on UICollectionView

The proposed offset is where the collection view would stop without our intervention. We peek into this area by finding its centre as proposedContentOffsetCenterX and examine our currently visible cells to see which one’s centre is closer to the centre of that area.

import UIKit
 
class CenterCellCollectionViewFlowLayout: UICollectionViewFlowLayout {
    
    var mostRecentOffset : CGPoint = CGPoint()

maxchuquimia

// Set the inset so that the first and last cells can appear in the middle of the UICollectionView
override func layoutSubviews() {
    super.layoutSubviews()
    contentInset = UIEdgeInsets(top: 0, left: frame.width / 2.0 - layout.itemSize.width / 2.0, bottom: 0, right: 0)
}

private func currentCentredCell() -> UICollectionViewCell? {
    return visibleCells.reduce(visibleCells.first) { (nearestCell, nextCell) -> UICollectionViewCell? in
        

loganwright

import Foundation

extension Dictionary {
    mutating public func setValue(val: AnyObject, forKeyPath keyPath: String) {
        var keys = keyPath.componentsSeparatedByString(".")
        guard let first = keys.first as? Key else { print("Unable to use string as key on type: \(Key.self)"); return }
        keys.removeAtIndex(0)
        if keys.isEmpty, let settable = val as? Value {
            self[first] = settable
        } else {

chriseidhof

protocol OptionalType {
    typealias T
    var optional: T? { get }
}

extension Optional : OptionalType {
    var optional: T? { return self }
}

extension SequenceType where Generator.Element: OptionalType {

phynet

##Generate and Install IPA's file in device through Command Line

###Thanks to Mattt and phonegap's scripts

Take a note: all this steps can be automatized in a single script, if you know how to write it. (Bash or Ruby will be fine)

1.- Install your Provisioning Profile and Developer Certificate

2.- Install Shenzhen and ios-deploy: the firstone will generate the IPA file and the secondone will install it onto your device

andymatuschak

//
//  CollectionViewDataSource.swift
//  Khan Academy
//
//  Created by Andy Matuschak on 10/14/14.
//  Copyright (c) 2014 Khan Academy. All rights reserved.
//

import UIKit

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

janodev

#import <Foundation/Foundation.h>

@interface MySingleton : NSObject

+(instancetype) sharedInstance;

// clue for improper use (produces compile time error)
+(instancetype) alloc __attribute__((unavailable("alloc not available, call sharedInstance instead")));
-(instancetype) init  __attribute__((unavailable("init not available, call sharedInstance instead")));
+(instancetype) new   __attribute__((unavailable("new not available, call sharedInstance instead")));

bjhomer

- (id)init
{
  UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainInterface" bundle:nil];
  self = [storyboard instantiateViewControllerWithIdentifier:@"MyControllerIdentifier"];

  // Set up ivars here. 'self' won't be nil; if it is, you passed an invalid identifier
  // and UIKit would have thrown an exception anyway.

  return self;
}