iPhone SDK 3.0 beta - no backing out!

2009-04-13 20:00:00 -0400

Right now we’re putting the finishing touches on our first iPhone app to get it into the App Store, or hopefully at least through the approval process. Who knows, really. But we’re hustling, we’ve put a lot of work into these products and we’d like to at least get them out there soon.

In the spirit of staying on top of things, I downloaded and installed the iPhone SDK 3.0 betas (1 and 2) on my development machine. I just wanted to be able to take a look at things so that I could get a head-start on the next generation of our apps. But so far, errors and extreme weirdness have been keeping me from my work on our current apps for the current platform. You’d think when you switch the build environment for platform 2.2.1, the entire XCode environment would adapt, but that’s not what happens. The helpers seem to be generating nib files for the new SDK, I can no longer create grouped-style table views, there are random crashes, nuisance deprecation warnings for the new SDK I’m not using.

Obviously, beta software is beta software, so caveat emptor, but I can’t find any good information on backing out the 3.0 beta installations and resetting my environment. In addition, I’m told that Apple isn’t accepting apps in the store built using this new version of XCode, even if they are built for the current platform, which is in and of itself really lame if true. Still trying to confirm that. So I’d advise anyone doing development right now to hold off on installing the beta SDK environments on their primary development machine. Install it on a spare machine, I reckon. What a nuisance!

Update: Apple does warn you about this on the SDK download page. Among others:

  • iPhone SDK for iPhone 3.0 beta is for development purposes only. This software should only be installed on devices dedicated exclusively for iPhone 3.0 beta application development.
  • iPhone SDK for iPhone 3.0 can not be used for submitting iPhone OS 2.2.1 applications to the App Store.

We Get Email

2009-04-12 20:00:00 -0400

From BW, a fan:

I loved STRIP [on] the palm and have tried all of the password management apps for the iPhone and they all SUCK. Even if I don’t make the Beta, can’t wait for the release, and will definitely buy it.

Strip Icon This sort of thing has been happening a lot, so it’s got us pretty excited. The next release of the STRIP for iPhone beta is a round the corner, so send your UDID to support@zetetic.net if you’d like to help test and check it out. We just got approved by the Department of Commerce to distribute what they call Mass Market Encryption, so now we can finally submit it to the App Store. More on that madness later.

Twitter API: With Great Power Comes Great Responsibility

2009-04-08 20:00:00 -0400

Last night the folks at Twitter released a significant update to their API. Among the changes was a massive change to the way the Twitter API responds to time-sensitive queries. In short, the since parameter and If-Modified-Since
header are no longer supported.

For those unfamiliar with the API, these features allowed searches for Public Tweets or Direct Messages that occurred after a specific point in time. It was intended to both reduce load on Twitter’s service and allow API clients to selectively retrieve tweets that they haven’t seen yet based on a time stamp.

The fact that the API changed is not shocking. The Twitter team had a solid reason behind it, as it seems date based queries weren’t handled efficiently enough for widespread use. There is even an alternate API search, based on message id, that can provide a similar function. Therefore these changes could really stand to benefit the developer community as a whole by providing increased capacity and performance for the API.

The API change was dangerous

First, and most importantly, the API was modified in a way that it would simply begin to ignore since parameters as if they weren’t even there. This means that clients querying the API with the expectation of retrieving a limited subset of tweets they hadn’t seen yet would, all of a sudden, start seeing a completely unfiltered feed of tweets, including ones from the past.

Consider the hundreds of applications like our own apps Tempo and PingMe, which process Twitter direct messages they haven’t yet seen to perform operations on a user’s data. Applications polling the Twitter API using the since parameter would be flooded by old, duplicate messages that they had already processed, possibly causing rampant duplication and perhaps data corruption.

edit: Let me draw an analogy: imagine that one day before release MySQL (or pick your favorite DB) decided to deprecate and ignore the the greater than > operator on queries. No errors – it would just pretend that query clause didn’t exist and return all rows for queries that used a >. How would that affect your application?

It is just poor form for a public API to change in such a way that the results of API operations become unpredictable like this. The API release notes claim this approach was used to ensure that existing applications didn’t break, but in fact would almost guarantee catastrophic failure of applications dependent on the function.

Errors are OK

Don’t get me wrong, it’s absolutely Twitter’s prerogative to change the API, and they can do so whenever they want. But with tens of millions of users and thousands of application and sites using the Twitter API, they should be more responsible about these kinds of changes.

If the API drops support for certain operations, just return an error message. Sure, it will be annoying to get error until the application is fixed, but at least you don’t risk corrupting thousands of down-stream integrations with improper data.

24 is only good enough for Jack

To make the situation worse, Twitter gave their developer community 1 day notice about the breaking change. Imagine if you didn’t get that email, or consider a case where an API release occurred without notification.

edit: When you expose a public API it becomes a contract with your developer community. If you make a breaking change to the API you have a fundamental responsibility to effectively communicate the change and ensure that it doesn’t create massive and unpredictable results for clients.

As Twitter grows and becomes more popular in the mainstream it needs to establish a process for notification on API changes and stick with it. Give the developer community enough time to properly code and test changes to their applications before a release. If it’s not convenient to do on the main API, perhaps they could consider some sort of business service that would provide premium access and a stabler environment for groups and teams like ours that really depend on it.

Making NSDate a little less painful

2009-03-25 20:00:00 -0400

I just made a couple of updates to our NSDate (Helper) project, thanks to a suggestion from Stephan Burlot in our comments. We’re not the only ones who think working with NSDate is a big pain! The code I had in there to determine relative days ago was based off of NSCalendar and while accurate in its own special way, wasn’t quite what you’d want for a relative time display.

In addition to the tweaks made in the code, I finally got around to creating a more illustrative set of examples in the README, and put up a corresponding document in our software archive. Check out how it works over at Github.

Deep Thought

2009-03-25 20:00:00 -0400

I miss my old Treo’s bluetooth sync capability. And for a device that does syncing (although in a much more limited way) and has bluetooth, it’s somewhat obnoxious that I have to sync over the wire with my iPhone, that wireless sync isn’t available.

It’s amazing that all smart phones still commonly cripple the bluetooth capabilities of the devices to keep you from using them and for all sorts of reasons – Apple doesn’t want you looking at the file system, Verizon wants you to buy ring tones over their EVDO network, etc. I was hoping Apple would be a pioneer here, tell the carriers to shove it, and go further than Palm did, making other bluetooth capabilities available.

On a mostly unrelated note, there has got to be a better way to package up and bundle Cocoa code you frequently use in different applications.