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Greetings, NSHipsters!

As we prepare to increment our NSDateComponents -year by 1, it's time once again for NSHipster end-of-the-year Reader Submissions! Last year, we got some mind-blowing tips and tricks. With the release of iOS 7 & Mavericks, and a year's worth of new developments in the Objective-C ecosystem, there should be a ton of new stuff to write up for this year.

Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

Using NSStringFromSelector(@selector()) as a safer way to do KVC / KVO / NSCoding.
Panic's [rather surprising discovery about the internals of the Lightning Digital AV Adapter](http://www.panic.com/blog/the-lightning-di

Storyboard Segues initially seem like a pretty cool way to construct interfaces using minimal glue code. But actually, ordinary nibs already support this, and in a much more flexible way.

Certainly, a Storyboard lets you bind a button action up to display a view controller with no code, but in practice you will usually want to pass some data to the new controller, depending on which button you used to get there, and this means implementing the -prepareForSegue:sender: method, which rapidly becomes a giant if/elseif statement of doom, negating most of the benefit of the codeless segue:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"modalSegue"])
    {
        ModalViewController *controller = (ModalViewController *)segue.destination;

controller.someProperty = someValue;

Method

- (void)addObserver:(id)observer
            forName:(NSString *)name
             object:(id)object
              queue:(NSOperationQueue *)queue
         usingBlock:(void (^)(NSNotification *note, __weak id observer))block;

Usage

	typedef enum _UIBackgroundStyle {
	UIBackgroundStyleDefault,
	UIBackgroundStyleTransparent,
	UIBackgroundStyleLightBlur,
	UIBackgroundStyleDarkBlur,
	UIBackgroundStyleDarkTranslucent
	} UIBackgroundStyle;

	@interface UIApplication (UIBackgroundStyle)
	-(void)_setBackgroundStyle:(UIBackgroundStyle)style;

	//
	// CRParallaxMotionEffect.h
	// CeedBase
	//
	// Created by Raphael Sebbe on 23/07/13.
	// BSD License (3-clause). Copyright (c) 2013 Creaceed. All rights reserved.
	//

	#import <UIKit/UIKit.h>

	/*
	* Copyright (c) 2013 CodaFi. All rights reserved.
	*
	* @APPLE_LICENSE_HEADER_START@
	*
	* This file contains Original Code and/or Modifications of Original Code
	* as defined in and that are subject to the Apple Public Source License
	* Version 2.0 (the 'License'). You may not use this file except in
	* compliance with the License. Please obtain a copy of the License at
	* http://www.opensource.apple.com/apsl/ and read it before using this

	///////////////////////////////////////////////////////////////////////////////////////////
	#pragma mark - Warn if we KVO a weak property

	// Doesn't support key paths.
	static BOOL PSPDFIsWeakProperty(id object, NSString *keyPath) {
	objc_property_t property = class_getProperty([object class], keyPath.UTF8String);
	if (property) {
	// https://developer.apple.com/library/mac/documentation/cocoa/conceptual/objcruntimeguide/articles/ocrtpropertyintrospection.html
	const char *attributes = property_getAttributes(property);
	return attributes && strstr(attributes, ",W");

	//
	// HWKViewController.m
	// HardwareKeyboardUI
	//
	// Created by Steven Troughton-Smith on 13/11/2013.
	// Copyright (c) 2013 High Caffeine Content. All rights reserved.
	//

	#import "HWKViewController.h"

	-(BOOL)canBecomeFirstResponder
	{
	return YES;
	}

	-(UIKeyCommand )_keyCommandForEvent:(UIEvent )event // UIPhysicalKeyboardEvent
	{
	NSLog(@"keyCommandForEvent: %@\n\
	type = %i\n\
	keycode = %@\n\

	// clang -fobjc-arc -framework Foundation runtime-class.m

	#import <Foundation/Foundation.h>

	#import <objc/runtime.h>


	@interface Person : NSObject

	- (id)initWithFirstName: (NSString )firstName lastName: (NSString )lastName age: (NSUInteger)age;