Nik Zakirin zyrikin

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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;

	//
	// TransitionController.h
	//
	// Created by XJones on 11/25/11.
	//

	#import <UIKit/UIKit.h>

	@interface TransitionController : UIViewController

	i386 : iPhone Simulator
	x86_64 : iPhone Simulator
	arm64 : iPhone Simulator
	iPhone1,1 : iPhone
	iPhone1,2 : iPhone 3G
	iPhone2,1 : iPhone 3GS
	iPhone3,1 : iPhone 4
	iPhone3,2 : iPhone 4 GSM Rev A
	iPhone3,3 : iPhone 4 CDMA
	iPhone4,1 : iPhone 4S

	- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
	{
	self.shouldReloadCollectionView = NO;
	self.blockOperation = [[NSBlockOperation alloc] init];
	}

	- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id<NSFetchedResultsSectionInfo>)sectionInfo
	atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
	{
	__weak UICollectionView *collectionView = self.collectionView;

	NSArray *albums = @[[Album albumWithName:@"Random Access Memories" price:9.99f],
	[Album albumWithName:@"Clarity" price:6.99f],
	[Album albumWithName:@"Weekend in America" price:7.99f],
	[Album albumWithName:@"Weekend in America" price:7.90f],
	[Album albumWithName:@"Bangarang EP" price:2.99f]];

	// Reversing an Array
	__unused NSArray *reversed = albums.reverseObjectEnumerator.allObjects;

	// PREDICATES

	static BOOL PSPDFIsDevelopmentBuild(void) {
	#if TARGET_IPHONE_SIMULATOR
	return YES;
	#else
	static BOOL isDevelopment = NO;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	// There is no provisioning profile in AppStore Apps.
	NSData *data = [NSData dataWithContentsOfFile:[NSBundle.mainBundle pathForResource:@"embedded" ofType:@"mobileprovision"]];
	if (data) {

	<?xml version="1.0" encoding="UTF-8"?>
	<Bucket
	type = "2"
	version = "2.0">
	<Breakpoints>
	<BreakpointProxy
	BreakpointExtensionID = "Xcode.Breakpoint.SymbolicBreakpoint">
	<BreakpointContent
	shouldBeEnabled = "Yes"
	ignoreCount = "0"