Swift & the Objective-C Runtime
Written by Nate Cook January 26th, 2015 This article has been translated into: 中文 Even when written without a single line of Objective-C code, every Swift app executes inside the Objective-C runtime, opening up a world of dynamic dispatch and associated runtime manipulation. To be sure, this may not always be the case—Swift-only frameworks, whenever they come, may lead to a Swift-only runtime. But
Formatter
Conversion is a tireless errand in software development. Most programs boil down to some variation of transforming data into something more useful. In the case of user-facing software, making data human-readable is an essential task — and a complex one at that. A user’s preferred language, calendar, and currency can all factor into how information should be displayed, as can other constraints, suc
NSError
Written by Mattt October 14th, 2013 This article has been translated into: 中文 To err is human. To NSError is Cocoa. All programs on a Unix system are a child process of another process, forking all the way from the original process, the unmoved mover: pid 1 (which in the case of OS X is launchd). When the executable finishes, it communicates a status code between 0 and 255 to its parent, as a way
UIAlertController
Written by Mattt September 30th, 2014 This article has been translated into: 中文 Did you know that UIAlertView and UIActionSheet (as well as their respective delegate protocols) are deprecated in iOS 8? It’s true. ⌘-click on UIAlertView or UIActionSheet in your code, and check out the top-level comment: UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyle
Swift Default Protocol Implementations
Written by Mattt September 2nd, 2014 This article has been translated into: 中文 Swift was announced 3 months ago to the day. For many of us, it was among the most shocking and exciting events in our professional lives. In these intervening months, it’s safe to say our collective understanding and appreciation of the language has evolved and changed significantly. First came the infatuation period.
XCTestCase /<br/>XCTestExpectation /<br/> measureBlock()
Although iOS 8 and Swift has garnered the lion’s share of attention of the WWDC 2014 announcements, the additions and improvements to testing in Xcode 6 may end up making some of the most profound impact in the long-term. This week, we’ll take a look at XCTest, the testing framework built into Xcode, as well as the exciting new additions in Xcode 6: XCTestExpectation and performance tests. Most Xc
Swift Operators
Written by Mattt October 3rd, 2018 (revised) This article has been translated into: 中文 What would a program be without operators? A mishmash of classes, namespaces, conditionals, loops, and namespaces signifying nothing. Operators are what do the work of a program. They are the very execution of an executable; the teleological driver of every process. Operators are a topic of great importance for
Swift Documentation
Written by Nate Cook & Mattt July 11th, 2018 (revised) This article has been translated into: 中文 Code structure and organization is a matter of pride for developers. Clear and consistent code signifies clear and consistent thought. Even though the compiler lacks a discerning palate when it comes to naming, whitespace, or documentation, it makes all the difference for human collaborators. This week
NSCalendarUnitYear
Written by Mattt July 7th, 2014 This article has been translated into: 中文 NSHipster.com was launched 2 years ago to the day, with a little article about NSIndexSet. Each week since has featured a new article on some obscure topic in Objective-C or Cocoa (with only a couple gaps), which have been read by millions of visitors in over 180 different countries. This is actually the 101st article, which
IBAction / IBOutlet / IBOutletCollection
In programming, what often begins as a necessary instruction eventually becomes a vestigial cue for humans. In the case of Objective-C, #pragma directives, method type encodings, and all but the most essential storage classes have been rendered essentially meaningless, as the compiler becomes increasingly sophisticated. Discarded and disregarded during the compilation phase, they nonetheless remai
UIAppearance
Written by Mattt March 11th, 2013 This article has been translated into: 中文 Style vs. Substance. Message vs. Medium. Rhetoric vs. Dialectic. Is beauty merely skin deep, or is it somehow informed by deeper truths? What does it mean for something to possess good design? Are aesthetic judgments relative, or absolute? These are deep questions that have been pondered by philosophers, artists, and maker
iOS 8
Written by Mattt June 9th, 2014 This article has been translated into: 中文 Ask anyone, and they’ll tell you: WWDC 2014 was one of the most exciting in recent memory. It was, first and foremost, a developer event, with nary a hardware announcement to upstage the latest software & developer tools. And boy howdy, was there a lot to be excited about. The announcements from iOS 8 & OS X Yosemite alone w
KVC Collection Operators
Simple Collection Operators @count: Returns the number of objects in the collection as an NSNumber. @sum: Converts each object in the collection to a double, computes the sum, and returns the sum as an NSNumber. @avg: Takes the double value of each object in the collection, and returns the average value as an NSNumber. @max: Determines the maximum value using compare:. Objects must support compari
FileManager
Written by Mattt October 29th, 2018 (revised) This article has been translated into: 中文 One of the most rewarding experiences you can have as a developer is to teach young people how to program. If you ever grow jaded by how fundamentally broken all software is, there’s nothing like watching a concept like recursion click for the first time to offset your world-weariness. My favorite way to introd
instancetype
Written by Mattt December 10th, 2012 This article has been translated into: 中文 Want to know what’s coming next in Objective-C? Keep your ear to the ground. Objective-C is a rapidly evolving language, in a way that you just don’t see in established programming languages. ARC, object literals, subscripting, blocks: in the span of just three years, so much of how we program in Objective-C has been ch
NSSortDescriptor
Written by Mattt July 24th, 2012 This article has been translated into: 中文 Sorting: it’s the mainstay of Computer Science 101 exams and whiteboarding interview questions. But when was the last time you actually needed to know how to implement Quicksort yourself? When making apps, sorting is just something you can assume to be fast, and utility is a function of convenience and clarity of intention.
Xcode Plugins
Apple is nothing if not consistent. From Pentalobular screws to Sandboxing, customers are simply expected to relinquish a fair amount of control when they choose to buy a Mac or iPhone. Whether these design decisions are made to ensure a good user experience, or this control is exercised as an end in itself is debatable, but the reality is that in both hardware and software, Apple prefers an ivory
Core Data Libraries & Utilities
Wrappers Wrapper libraries provide some much needed syntactic sugar and convenience methods to Core Data’s verbose and complicated APIs. For example, to insert a new managed object into a managed object context, it’s a class method on, not NSManagedObject or NSManagedObjectContext as one might reasonably expect, but NSEntityDescription. NSEntityDescription +insertNewObjectForEntityForName:inManage
Multipeer Connectivity
As consumer web technologies and enterprises race towards cloud infrastructure, there is a curious and significant counter-movement towards connected devices. In this age of mobile computing, the possibilities of collaboration, whether in work or play, have never been greater. In this age of privacy concerns and mass surveillance, the need for secure, ad hoc communications has never been more pres
NSPredicate
@objcMembers class Person: NSObject { let firstName: String let lastName: String let age: Int init(firstName: String, lastName: String, age: Int) { self.firstName = firstName self.lastName = lastName self.age = age } override var description: String { return "\(firstName) \(lastName)" } } let alice = Person(firstName: "Alice", lastName: "Smith", age: 24) let bob = Person(firstName: "Bob", lastName
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