Curated topic · 16 ARTICLES
Explore practical Objective-C articles grounded in clear explanations and engineering tradeoffs.
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The moment you attach an observer, KVO dynamically swaps the object's class with a subclass. This covers isa-swizzling, why class lies, and when notifications are not sent without going through the setter.
Read articleCategories cannot add ivars, but Associated Objects let you attach values. This article explains the side table stored beside objects, a complete category-property implementation, and memory policies where assign requires care.
Read articleMethod swizzling is a technique that swaps, at runtime, the mapping table connecting selectors and IMPs. This guide covers the conventional implementation, the side effect of _cmd lying, and the boundaries of acceptable use.
Read articleWhy does method-swizzling code always go in +load? Can’t we put it in the similar-looking +initialize instead?
Read articleOne of the most common lines in iOS crash logs is unrecognized selector sent to instance.
Read article"Why do we still use @autoreleasepool in the ARC era?"
Read articleRunning this code in Objective-C produces a rather surprising result.
Read articleIn Objective-C code, [receiver message] syntax wrapped in brackets looks like an ordinary method call.
Read articleiOS development has a point that often causes confusion.
Read articleWhen you first study Objective-C, the id type can make you pause.
Read articleAnyone starting iOS development has wondered at least once: "Why did Apple create Swift from scratch instead of sticking with the Objective-C it was already using?"
Read articleIf you work on iOS development, there’s probably something you’ve wondered about at least once.
Read articleThere’s one thing that really confuses developers new to iOS.
Read articleWhen you start studying iOS development, there’s one language you’re bound to encounter: unfamiliar syntax filled with brackets and mysterious prefixes like NSString.
Read articleIt’s easy to feel confused when you first encounter Objective-C code after starting to study iOS.
Read articleWhen you first open Objective-C code, one thing immediately catches your eye.
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