iCloud looks like it will be an incredible technology for moving app data between devices. This is inherently a good thing, and it will open avenues for many new types of apps. But, there is a fundamental problem. Right now, the only way to access it is through Objective-C APIs embedded into iOS and Mac OS X. Under the hood, they are obviously talking to the network and doing the business of syncing data, but that networking layer is not exposed or documented, and would have to be reverse-engineered in order to understand and use. So the only way for developers to move their data through this system is through a pre-compiled bundle that gets referenced within an application.

This has a few interesting practical repercussions. If you build an application targeting iCloud, you can only ever put it on two platforms - Mac and iOS. You will never be able to port it to Android, WebOS, Windows Phone, or the web (mobile or desktop). If you sync data through iCloud, And, you will never be able to have a server component that can do things with your data all the time.

Here's some examples of what I'm talking about. In my To Do list app, Todolicious, one thing I would love to be able to do is to push badges to your iPhone and Mac showing the number of To Dos you have left. When you tap a To Do to mark it as done, suddenly all your devices would show the correct number on the icon. With the sync server I was building, this was fairly trivial; wait for the user's list to change, and send a signal to push the count everywhere. But if I back Todolicious with iCloud, I have no way of speaking between my server and iCloud (and I'd still need a server of some kind to send the notifications, after all).

Similarly, if I were to build a web app version of Todolicious (which I was planning on), I could not get access to that data within iCloud at all. I'd have to have either to sync to both iCloud and a custom solution (unwieldy, poor UX and network traffic, and otherwise gross), or not load existing data at all (completely negating the benefit of having such a web app).

So there is a serious ecosystem lock-in problem for apps that wish to target iCloud. All of these problems go away when iCloud is made available as a server-to-server API. A big benefit in the promise of cloud computing includes service interoperability, but right now iCloud is merely a data silo. I have filed this as a bug, rdar://9598555, for a server-to-server API (through which you could build code that speaks to iCloud on your server or on other platforms). I dearly hope Apple addresses it.

Such a server-to-server API would drastically decrease the friction of setting up cloud services to complement an iCloud-backed app, and would lead to better apps and more pleased users.


Two years ago, I began working on a new Twitter client for iPhone, named Streamlines. I hinted at it about a year ago, and has been a driving force in my development of MGTwitterEngine and a ton of open source projects. I've come to the conclusion that I won't have time to finish and release it, as there's still probably another 6 months of development needed to really ship it, and hostility from Twitter and from users of other Twitter clients make effort into building one unsustainable. However, I think there are UI concepts in there which are totally unique and have never been seen before, so I'd like to share them with you before this project is lost to the annals of dead projects.

Here's a video walking through some of the main UI concepts found in Streamlines.

Streamlines is a social networking client that is designed to show you what you want to see, and hide what you don't care about. To do this, it avoids using tab bars and navigation stacks, and instead uses a card interface with a horizontal swipe, similar to the iPhone's Weather app or WebOS' multitasking UI. You pick which timelines you want to see.

On top of that, you can merge multiple timelines together, across all types of timelines, accounts, and services. For example, if you use Lists on Twitter and Facebook to organize, say, your family members, you can create one contiguous timeline which combines both those lists and shows you what your family members are doing, regardless of where they posted it to. Or, you can combine your Twitter followers, mentions, and direct messages together, similar to how Twitterrific works. This saves you time, as it lets you create your own timelines which show you new perspectives on your social networks that you simply can't get with most Twitter clients.

Streamlines tries to make sure you always are looking at the best data, so for every tweet you see on screen, it will update the relative date in real time. So if a tweet is 6 seconds old, it'll update live to say "6s", "7s", "8s", etc. The time is always up to date, so you know how long ago someone actually posted something. Streamlines accounts for API rate limiting, using some advanced heuristics to schedule API requests so that you never run out. This was more a problem two years ago, when you had 30 API requests per hour shared across all your Twitter clients, but still handy. And it handles incoming and outgoing attachments, so if you or someone else embeds content from another site, Streamlines will replace the URL inline with a preview of the image or video.

Under the Hood

Streamlines is backed by two frameworks I wrote, BirdNest and BirdNestUI. They're frameworks because, well, I actually have about 8 apps which use the same Twitter source code, spanning iPhone, iPad, and Mac. This framework tries to encapsulate a lot of functionality - it includes multiple accounts (with credentials stored in the Keychain) spanning multiple services (Twitter and Facebook, with plans to expand into other timeline services like Google Buzz, Foursquare/Gowalla, Yelp, etc.), networking, persistent data, and lots more. It's powered with Core Data and has about 12 open source projects which make up various pieces. The UI framework contains views for showing and creating accounts and timelines, creating tweets or wall posts, and showing timelines in tables (and there's a corresponding UI framework for Mac).

Why Won't It Ship?

There are many reasons. First and foremost, it's at least 6 months out from being released, and that's optimistic. There are lots of bugs, crashes, and UI problems alone, not to mention whole views just not having been built yet. So there's a huge body of work still to be done. I haven't had much opportunity to work on it recently, and there's not much to suggest I'll have more soon.

On top of that, building a Twitter client has become far less appealing than it was two years ago. In those two years, Twitter has drastically increased their feature set to include a TON of things, including geolocation, native retweets, and lists to name a few. The only way to remain competitive is to iterate extremely fast to include every new feature, whenever Twitter announces them. At the same time, Twitter has made several very hostile moves to make it even less appealing to develop on their platform; the most egregious of which was the acquisition of Atebits and their Twitter client Tweetie. There's now such tremendous market saturation for Twitter clients, especially on iPhone. Releasing a new Twitter app now is difficult, as nobody really pays attention to new Twitter clients any more.

Competing with Twitter's free app is hard enough. Even if I could get it to market, there are tons of users who will demand that every feature Twitter offers be crammed into every new release. And everybody's list of must-haves is different; some people will only care about lists, and will rail on you if they can't edit lists. Some will only care about the geolocation feature and if you can put that on a map. Some will only care about native retweets and seeing a list of people who retweeted. Every one of those features, to these users, is a line item on a checklist that needs to exist. To a developer, every one of those features can take weeks or even months to build properly. But every one has to be in there. Oh, and all of those features need to coexist, cleanly, on a small screen, with a fantastic user interface. It is an insanely complex problem to solve.

All of which needs to be built for an app that will not receive much attention, that will be crowded out of the market and will need to be priced cheaply to compensate, and that will be overshadowed by Twitter's own app anyway. There just simply isn't much reason to build a Twitter client anymore. I would much rather spend my time building an app that users will judge for its own merits, not for its completeness in binding to another service.

Going Forward

I'm not sure what to do with Streamlines as it is today. I do think there is a market for niche apps which use Twitter, and I still have some intention of bringing those to market. But I can't say when, and if they ever come, they will not be full Twitter clients.

I'm considering open-sourcing the code, but I'm not convinced of its practicality yet. I'm hesitant to think that someone will want to adopt a monolithic framework for building their own Twitter apps. It's possible they do. But the code is not the cleanest, and there are surely lots of bugs.

That being said, if anyone wishes to build an app with a similar interface, they have my full blessing and encouragement to do it without any permission from or attribution to me needed. I'd like to see more variance in Twitter client UI in general, as the tab bar metaphor is pretty worn at this point.

I would love to hear any and all feedback, positive or negative, either by Twitter or by leaving comments on the YouTube video above. Thanks for watching and reading.


This is hilariously effective. It scrapes a few online lyrics databases and does some analysis to determine the quality of a rhyme. Be sure to check the bottom of the whitepaper for some sample output. Direct PDF link.


I wish I had found this article months ago. In it, Chris Hanson demonstrates how to merge multiple model files into one contiguous model object at runtime. This can be useful in many situations, such as large models with lots of entities, and scattered models in separate plugins. Extremely informative.


Twitter uses OAuth as its supported form of authentication. This is fine for some apps like clients where users need to authenticate themselves, but it doesn't work well for bots or scripts run by one person. If the bot needs an access token, it can be a real pain to obtain without writing the intermediate code.

This application, OAuthery, serves a simple purpose. You supply it the consumer key and secret for your OAuth application. It creates a request token and the URL for authorizing it. You complete the authorization in a web browser and get a PIN number. You then enter that PIN number back into the application, and it spits out your access key and secret. At this point, the user authentication is complete, and you can add those credentials to your script, and access API resources.

This is largely intended as a developer tool for people developing applications with Twitter's OAuth impelmentation. It also provides code to show exactly how to perform the authentication process with OAuth and Twitter, so that developers who wish to implement such functionality in their own apps can use this as reference.


Inactive, because it's a simple tool that serves a limited purpose.


OpenEmu is a Cocoa framework and application for running multiple emulators as plugins. Many popular open source emulators; such as SNES9x, Nestopia, and VisualBoyAdvance; are fully compatible with this system. As all the emulators are going through the same architecture, it can be tuned to use the latest Quartz and Core Graphics technologies to deliver screaming performance.

Most of my participation has been in fixing bugs and doing some application-side coding. My big task so far is an in-development ROM organizer powered by Core Data, with smart playlists, Quick Look for save states, and ratings.




VillainousStyle is a drawing library for defining a visual style from a chain of individual drawing instructions. Each instruction modifies the drawing context to perform common operations; such operations include shadows, fills, borders, and shapes. It allows for multiple style sheets which can be used to theme an application in multiple visual contexts. VillainousStyle sits on top of CoreGraphics, and does not use WebKit for rendering at all. It is a fork of the VSStyle and VSShape classes, originally from the Three20 project.


VSStyleSheet is an abstract superclass for a set of styles. Subclass it and add methods for each style you wish to add. You will likely want to create a protocol for your styles to implement, to ensure that your stylesheet implements all the necessary styles.

There is a global stylesheet, which can be thought of as the "active" stylesheet. Call +[VSStyleSheet setGlobalStyleSheet:] to change the active theme, which will fire a VSStyleSheetChangedNotification. When that gets fired, you'll want to tell your views to update their styles and redraw.


Styles affect drawing and positioning. Most will affect the next VSStyle objects in the chain.

  • Fills
    • VSSolidFillStyle - Fills the current shape with a solid color
    • VSLinearGradientFillStyle - Fills the current shape with a gradient between two colors
    • VSReflectiveFillStyle - Fills the current shape with a glossy-style gradient between two colors
  • Borders
    • VSSolidBorderStyle - Draws a border around the current shape with a solid color
    • VSBevelBorderStyle - Draws a beveled edge border for a 3D effect around the current shape
    • VSFourBorderStyle - Draws a border around the current shape with four colors, one for each edge
  • Shadows
    • VSShadowStyle - Draws a shadow behind content with a given color, blur, and offset
    • VSInnerShadowStyle - Draws a shadow inside the content with a given color, blur, and offset
  • Positioning
    • VSBoxStyle - Adds a margin or padding to the content area
    • VSInsetStyle - Adds edge insets to the content area
  • Content
    • VSTextStyle - Draws text inside the current shape
    • VSImageStyle - Draws an image inside the current shape
    • VSMaskStyle - Clips the drawing area to an image mask
    • VSShapeStyle - Clips the drawing area with a VSShape object


Shapes affect the fills and borders, but do not clip the content styles.

  • VSRectangleShape
  • VSRoundedRectangleShape
  • VSRoundedLeftArrowShape - a rounded rectangle with a left-facing arrow
  • VSRoundedRightArrowShape - a rounded rectangle with a right-facing arrow

Future Ideas

  • iPhone static library
  • Cappuccino library
  • File-based stylesheets that can be read/written from VSStyleSheet objects
  • GUI builder for styles
  • More styles!




The templates that ship with Xcode are not the greatest. Some of them are inconsistent and don't enforce good coding standards (e.g. missing a dealloc method). Other templates which would be useful just flat out don't exist (e.g. an NSOperation subclass, or a protocol header file). This project aims to supplement or replace the built-in templates for Xcode to speed up coding and improve the quality of code.

Coding Standard

All files will be processed by Xcode. The generated source files must produce consistent, readable, commented code. The code must have these characteristics:

  • Each file must have a comment block at the top describing the file.
  • Each class must implement its superclass' designated initializer and dealloc.
  • Stub methods must be organized by their purpose, class or protocol. -- Each group must be organized by their class hierarchy, with protocol stubs following. -- Each group must be prefaced by a pragma mark naming the class or protocol the methods were implementing. -- Clusters of methods (such as relating to KVO) should be organized along the lines above, with a pragma mark.
  • All method implementations should contain a method call to their super implementation if needed.
  • All method implementations should contain a commented out stub line that will signify where to insert their code.
  • All comments must be in the form of two slashes //, and none using the /* */ form. This will allow developers to comment out large blocks of code as needed.

Wish List

  • Different people want different things in their template. For instance, someone may want to include an implementation of observeValue:... for every class. Would be nice to have a template generator application (yeah yeah, very meta) which would make templates customized to the developer.




URL Shrink is a new OS X tool with a very simple purpose - converting URLs to shorter permalinks on various web services. As the internet has matured, and services like IM, IRC, and Twitter have forced us to write shorter messages, it was clear that a system was needed that was as ubiquitous as Quicksilver.

For now, the main service of URL Shrink is just converting a URL that is on the clipboard, although this will be expanding over time (including things like a system text service, a command line client, a Quicksilver plugin, etc.). To do this, there is a keyboard shortcut (option-shift-space) which will convert the URL in the background to a tiny URL using one of the services provided. If you've selected one as your favorite, it'll choose that one. For example, I'm personally partial to is.gd, so all the URLs that are processed by URL Shrink on my machine go through is.gd.

At a low level, URL Shrink is a system where multiple shrinking engines can be added. It was designed to be extremely easy for developers to write just a little bit of code to integrate with other web services, including private URL services. For information on that, see the project page below.

URL Shrink is licensed under the BSD license. I encourage its adoption within other applications; I'll be adding .framework and .a targets for building this into Mac and iPhone apps respectively. Indeed, the project was born out of the URL shrinking capacity of another app I'm working on.




This one is for all of those developers out there who scoff at JavaScript. This is a working neural network algorithm in JavaScript used for ripping apart CAPTCHA images (in this case, from Megaupload) and deciphering them. This is really sophisticated stuff, and even though Megaupload has some pretty easy CAPTCHAs, this should be pretty easily adaptable to other CAPTCHAs.

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