NSAssertionHandler
Written by Mattt February 25th, 2013 This article has been translated into: 中文 “When at first you don’t succeed, use an object-oriented injection point to override default exception handling.” This is the sort of advice you would have learned at mother’s knee if you were raised by NSAssertionHandler. Programming incorporates numerous disciplines of human reasoning, from high-level discourse and se
JavaScriptCore
JavaScript evaluation isn’t limited to single statements. When you evaluate code that declares a function or variable, it’s saved into the context’s object space. context.evaluateScript(#""" function triple(number) { return number * 3; } """#) context.evaluateScript("triple(5)")? .toInt32() // 15 Handling Exceptions The evaluateScript(_:) method doesn’t expose an NSError ** pointer and isn’t impor
The Death of Cocoa
Written by Mattt December 29th, 2014 This article has been translated into: 中文 Cocoa is the de facto standard library of Objective-C, containing many of the essential frameworks for working in the language, such as Foundation, AppKit, and Core Data. Cocoa Touch is basically just Cocoa with UIKit substituted for AppKit, and is often used interchangeably with Cocoa to refer to the system frameworks
Pay
Written by Jack Flintermann December 8th, 2014 This article has been translated into: 中文 There’s a unique brand of modern angst that manifests the moment you decide to buy something online. While there’s no English word for it, it translates roughly to “Where is my credit card? What is its number? How badly do I actually want this thing, anyway?”. When you’re on an iOS device, this ennui intensifi
WKWebView
Written by Mattt July 25th, 2018 (revised) This article has been translated into: 한국어 iOS has a complicated relationship with the web. And it goes back to the very inception of the platform over a decade ago. Although the design of the first iPhone seems like a foregone conclusion today, the iconic touchscreen device we know and love today was just one option on the table at the time. Early protot
UIApplicationDelegate launchOptions
Written by Mattt December 16th, 2013 This article has been translated into: 中文 AppDelegate is the dumping ground for functionality in iOS. Application lifecycle management? URL routing? Notifications? Core Data incantations? Invasive and monolithic 3rd-party SDK initialization? Random functionality that doesn’t seem to fit anywhere else? Just stash it in AppDelegate.m! And of all of the crowded, o
Stewardship
Open Source communities function within what economists describe as a Gift Economy. Rather than paying one another for goods or services through barter or currency, everyone shares freely with one another, and gains social currency based on their generosity. It’s similar to how friends tend to take turns inviting one another over for dinner or a party. With the negligible cost of distributing soft
Launch Arguments & <br/>Environment Variables
Written by Mattt October 21st, 2013 This article has been translated into: 中文 Walk into any American fast food establishment, and you’ll be greeted with a colorful, back-lit display of specials, set menus, and other a la carte items. But as those in-the-know are quick to point out, larger chains often have a secret menu, passed down by oral tradition between line cook workers and patrons over the
ReactiveCocoa
Written by Mattt February 18th, 2013 This article has been translated into: 中文 Languages are living works. They are nudged and challenged and bastardized and mashed-up in a perpetual cycle of undirected and rapid evolution. Technologies evolve, requirements change, corporate stewards and open source community come and go; obscure dialects are vaulted to prominence on the shoulders of exciting new
Key-Value Observing
Written by Mattt October 7th, 2013 This article has been translated into: 中文 Ask anyone who’s been around the NSBlock a few times: Key-Value Observing has the worst API in all of Cocoa. It’s awkward, verbose, and confusing. And worst of all, its terrible API belies one of the most compelling features of the framework. When dealing with complicated, stateful systems, dutiful book-keeping is essenti
xctool
Written by Mattt November 4th, 2013 This article has been translated into: 中文 Control the build system, and you control the destiny of the language, its ecosystem, and community. Objective-C has changed so very much in such a very short timespan. In just a few short years, the language has gone from humdrum NeXT vestige to a position of commanding influence. A significant portion of these prolific
Type Encodings
Written by Mattt February 4th, 2013 This article has been translated into: 中文 From number stations and numerology to hieroglyphs and hobo codes, there is something truly fascinating about finding meaning that hides in plain sight. Though hidden messages in and of themselves are rarely useful or particularly interesting, it’s the thrill of the hunt that piques our deepest curiosities. It is in this
Unit Testing
Written by Mattt May 27th, 2013 This article has been translated into: 中文 Unit Testing is an emotional topic for developers. It inspires a sense of superiority to its most zealous adherents, and evokes a feeling of inadequacy to non-practitioners. Cargo Cults like TDD stake their reputation on unit testing to the point of co-opting and conflating utility with morality. It’s as close to a religious
AFNetworking 2.0
Written by Mattt September 16th, 2013 This article has been translated into: 中文 AFNetworking is one of the most widely used open source projects for iOS and OS X development. It powers thousands of popular and critically acclaimed apps, and serves as the foundation for dozens of other great open source libraries and frameworks. With thousands of stars and forks, and hundreds of contributors, the p
Reader Submissions -<br/> New Year's 2013
Written by Mattt January 1st, 2013 This article has been translated into: 中文 In celebration of the forthcoming year++, I thought it’d be fun to compile a list of some of your favorite tips and tricks of the trade–to give y’all a chance to show off some of your NSHipster cred. Thanks to Cédric Luthi, Jason Kozemczak, Jeff Kelley, Joel Parsons, Maximilian Tagher, Rob Mayoff, Vadim Shpakovski, & @ale
Back Row
Apple TV Appliance Structure In the current Apple TV interface, the home screen contains a grid of rectangular icons, similar to the home screen on iOS. Each icon corresponds to an appliance. Why an appliance and not an application? An appliance is more limited in what it can do as compared to an application. On iPhone or iPad, applications range from social media clients and photo tools to games
NSURLProtocol
Written by Mattt November 5th, 2012 This article has been translated into: 中文 iOS is all about networking–whether it’s reading or writing state to and from the server, offloading computation to a distributed system, or loading remote images, audio, and video from the cloud. Because of this, Foundation’s URL Loading System is something that every iOS developer would do well to buddy up with. When g
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NSExpression