Rss

Archives for : October2011

Also, CodeMash

One more speaking update: I’ll once again be at CodeMash in Sandusky, OH, January 11-13, 2012.

Daniel Steinberg and I always try to do something different with the “precompiler” tutorial day, but this year, Apple is doing our work for us by making so many changes in the SDKs and tools (Xcode 4 was still NDA this time last year, IIRC). For this year, I’m doing a three-hour introduction to iOS tutorial in the morning, and Daniel is following up with Mac Development for the iOS Developer in the afternoon. It’s a nice reversal of how we did things in 2010, and lets mine serve as a pre-requisite for his.

Also, I’m doing one regular session, iOS Networking: Bonjour, iCloud!, which will be a top-to-bottom tour of iOS networking, from the new and high-level iCloud APIs, all the way down through Foundation and Core Foundation networking, to the nitty gritty of BSD sockets.

There are a number of other iOS related talks — more than I’d been led to believe — and while it’s not quite a full track unto itself, that’s kind of the point of CodeMash, getting people mingling in each other’s stuff. Although I sill reserve the right to scoff at web development as padded-room detention for the pointer-averse.

A few things to keep in mind about CodeMash: it is held at an enormous indoor waterpark resort, the largest in North America. As a presumable consequence, it sells out ridiculously fast: CodeMash 2011 filled up its 700 seats in 3 days. Thanks to the resort’s expansion, there are 300 more registrations available this year, but it’s a safe bet that it’ll fill up fast. Registration begins Monday morning, Oct. 24.

Speaking update and a Core Audio preview

Real life intervenes again (parsing PDF, whee!) and I have to cut short a planned epic iDevBlogADay entry. But I do want to bang out a few quick notes on various topics of interest.

Core Audio book coverThe first is Core Audio in iOS 5, which we can now talk about publicly. If we go through the iOS 4.3 to iOS 5.0 API Differences document, we see that Audio Units accounts for a large number of diffs. This comes from the addition of a suite of units that finally make programming at the unit level a lot more interesting. Whereas we used to get a single effects unit (AUiPodEQ), we now get high and low pass filters, the varispeed unit, a distortion box, and a parametric EQ that lets us play with sliders instead of the “canned” EQ settings like “Bass Booster” and “Spoken Word”. Even more useful, we get the AUFilePlayer, meaning you can now put audio from a file at the front of an AUGraph, instead of the sheer pain of having to decode your own samples and pass them to the AUGraph through a CARingBuffer.

iOS also gets the AUSampler unit introduced in Lion, which provides a MIDI-controlled virtual instrument whose output is pitch-shifted from a source sample. This was shown off at WWDC, although providing the source to the unit by means of an .aupreset is still a dark (undocumented) art. This is the first actual MIDI audio unit in iOS, which makes the presence of Core MIDI more useful on the platform.

Core Audio giveth, but Core Audio also taketh away: iOS 5 removes (not deprecates) VoiceIOFarEndVersionInfo. This struct, and its related constants (specifically kVoiceIOFarEndAUVersion_ThirdParty), were documented as interoperating with a hypothetical “3rd-party device following open FaceTime standards”, something I took note of last May as possibly meaning that FaceTime was still ostensibly being opened up. With the removal of these APIs, I think that closes the book on Apple having any intention to live up to its vow to publish FaceTime as an open standard.

There’s lots more to talk about, but I’m already over my allotted blogging time, and work beckons. Perhaps you’d like to hear me speaking about this stuff and demo’ing it? I’m doing an all-new-for-iOS-5 Core Audio talk at two upcoming conferences:

I’ll also be doing a talk about AV Foundation capture at these conferences. And back on audio, I just heard from my editor that the last three chapters of Core Audio should be in the Rough Cut on Safari Online Books in the next week or so, although I still have some work to do to clean up bits that are broken on Lion (read the sidebar on Audio Components if you’re having a problem creating audio units with the old Component Manager calls) and to clear out forward references to stuff that didn’t end up making the final cut for the book.

What Xcode 4 gets right (and Lion doesn’t)

It’s been a busy year for Apple user outrage, with radical changes to Xcode 4 and Final Cut Pro X provoking serious anger and lots of bitter denunciations on forums, blogs, Twitter and the like.

I can’t speak for Final Cut Pro X (I have yet to get my video hardware up to snuff), but frankly, I think Mac OS X 10.7 (Lion) deserves a lot more hate than Xcode 4.

And I’m happy to provide it.

Both have bugs, and with massive development, that’s not that surprising. I crash Xcode every few days. I get the spinning pinwheel of death from Lion every couple hours, in situations where it never occurred in Snow Leopard or earlier OS X releases. These will get smoothed out in time.

But once they are, what remains? Let me state my premise clearly: I like Xcode 4 because it’s built atop some fundamentally good ideas, and I dislike Lion because it’s not.

Let’s start with Xcode 4. Being on Lion, I can’t run Xcode 3 to reacquaint myself with the old days, but a few screenshots reminded me of some of its traits.

Xcode 3’s main window had a “Groups and Files” list on the left side. Except it didn’t have just files and groups of them. It also had an icon to represent your source code repository. And your recent searches. And smart searches. And bookmarks. And… you get the idea.

And that was before iPhone. Now Xcode had to handle provisioning, device management, remote debugging, archiving, and so on. iPhone development made demands that Xcode wasn’t really meant to handle, and it’s clear that iOS is going to be more and more important in the future, meaning that Xcode needs to be at least as aligned to iOS development as Mac, if not more so.

And this, to me, is what Xcode 4 gets right: it is a fundamental rethink of Xcode, informed by the first few years of iOS development. Its changes are radical, but in general, they’re based on cohesive and sensible ideas.

The biggest change in Xcode is how responsibilities are divvied up: the project workspace window is the container for anything related to a given project, and the organizer is for cross-project concerns like documentation, device management, source code repositories, and so on. Within the project workspace, there’s a fundamental left-to-right flow of specificity: a selection in the navigator sets the content area, and a selection in the content area can have further consequences in the utility area. That means we can pick files in the file navigator to bring them up in the source editor (the typical case), or use the log navigator to show build or runtime logs in the content area. The generic approach to the content area also opens up new opportunities: we already see this with Interface Builder incorporated as the editor for NIB files, and in Xcode 4.2, the content area offers up a new UI for editing storyboards.

Meanwhile, the now-prominent organizer makes the system of archiving builds more visible, which is critical not only because you now have to use this interface to submit to the App Store, but also because archiving is the only way to symbolicate and thereby make sense of crash logs you get back from Apple.

Quibble with specifics, or the roughness of a new codebase, but I do think Xcode 4 has its head in the right place. It’s built on fundamentally good, forward-looking decisions that put an end to the era in which Xcode frantically shoehorned in new iOS-related concepts, and is better positioned to adapt to whatever Apple throws at it over the next few years.

For a contrast, let’s look at Lion.

As with Xcode, I’ll set aside the annoying bugs — though I don’t know that I’ll ever forgive Lion’s Finder for losing the positioning of icons in most of my windows — and look at the ideas behind it.

What is the underlying concept of Lion? We’ve heard a lot about the importation of iPad features, notably the aggressive use of multi-touch gestures. The big one of these, of course, is the reversing of the scroll direction, dubiously spun as “natural” scrolling by Apple.

The problem with the iPad metaphors, for a start, is that there’s a fundamental difference between desktop and tablet gestures: desktop users are touching a proxy object like a magic mouse or trackpad. On the tablet, you can see the thing you’re touching; on the desktop, there’s a detach between the two.

In many ways, Lion seems optimized for laptops, which always have touchpads, and which enjoy a more intimate relationship with the user than a potentially sprawling desktop. As much as I hear the Mac Pro disk thrashing and see the aforementioned spinner, I also wonder if Lion isn’t really meant for use on machines with SSD storage instead of conventional hard disks.

And if Lion truly is optimized for portables, and if this is the reason for its seeming “iPad-ization”, I think it begs the question: why turn my Mac into an iPad, when I could just buy an iPad instead.

Honestly, I like my iPad. As I’ve said before, I like the iPad more than a laptop, and have gone iPad-only for my last few conferences. Thinking further ahead, the iPad is only going to get more powerful and more capable, while the traditional computer is fairly static in its abilities. Of all the things I need to do, the only productivity that’s really unavailable to me on the iPad is coding: there’s no Xcode for iPad, and it’s not clear whether a slimmed-down version would be possible with current hardware. But it’s not out of the question: Apple introduced Xcode in 2003, and the iPad 2 already outclasses a top of the line PowerBook of that era. In time, and probably not long from now, I’ll be able to do everything I care about on the iPad, and will be happy to.

So why compromise the desktop now, and turn it into something it’s not, which is to say a desktop OS with iPad features bolted on? Lion’s iPad-isms don’t really pay off for me, and what we’re left with is a mish-mash of incongruous concepts. Unlike Xcode 4, there’s no unifying concept behind Lion’s changes; instead, it feels like they’re trying to capture the iOS buzz and excitement, cramming in iPad-isms wherever they can be made to fit.

Steve Jobs famously made the analogy that desktop computers are like trucks, and that fewer and fewer people need trucks. It’s a clever and insightful analogy. The problem for me is that the people who need trucks don’t want those trucks turned into oversized sedans. What consistent ideas are present in Lion serve to work against what makes a desktop OS useful and productive in the first place.

The desktop OS doesn’t need a fundamental rethink; it may well be on a slow path to obsolesence, and it’s fine for Apple to let it go, as iOS is the heir apparent. But in lieu of a grand reinvention that is not likely, necessary, or needed, change for the sake of change is not welcome.

And don’t even get me started about the little things (monochrome icons in Finder sidebars, the hiding of ~/Library, Launchpad… must resist urge to hurt someone…)

Notes on “A Moral Code Cast in Steel”

The Prags started a forum for readers to discuss their thoughts about Steve Jobs, following his death yesterday, and asked some of their writers to prime the pump with some initial posts.

Mine, A Moral Code Cast in Steel, takes its inspiration from a quote from Ayn Rand’s Atlas Shrugged, about the expression of human genius and creativity in the form of physical things, the things we create.

It’s a dicey book to be quoting because there are a lot of people who hate, absolutely hate, Ayn Rand, and to co-opt a dead person and attach them to the selling of a product or belief system is potentially tasteless and offensive (yes, irony, thanks for noticing). And some of the objectivists doing so are being pretty ham-handed about it. The only reason I thought it was OK to proceed with is because we have that interview of Steve Wozniak saying that Jobs was inspired by Atlas Shrugged in his youth. That’s a sterling source, and easily verifiable, and that made the Jobs-Atlas analogy a viable and fair angle to take.

Plus, I think the central points really hold: that the will and ingenuity of the creator can be perceived in his or her works (indeed, it is what separates them from being raw materials), and that Jobs was particularly fascinating in finding inspiration and truth from many different sources: East and West, spiritual and physical, technology and liberal arts.

Of course, one can’t help but bring one’s own beliefs to the table. Here’s the scene immediately to my left while I work (click for full-size):

Standing desk flanked by bookcases with Rand's Atlas Shrugged and Tezuka's Buddha

Anyways, Bill got on board back in the NeXT days, and he’s got a great post too, so be sure to check that out.

Let’s trend #iphonepredictions

Come join the fun on the #iphonepredictions hashtag. Let’s see if we can trend it, or at least have a few laughs.