01
Nullability Annotations in Objective-C
Objective-CSwift-InteropType-Safety
Objective-C's nullability annotations tell the compiler which pointers can be nil. They catch bugs at compile time and make your code bridge to Swift cleanly.
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> Objective-c
// 19 articles available
- 02
Lightweight Generics in Objective-C
Objective-CType-SafetySwift-InteropObjective-C's lightweight generics let you specify element types for collections like NSArray<NSString *>. They catch type mismatches at compile time and improve Swift bridging.
READ_ARTICLE - 03
Operator Precedence Gotchas When Moving Between Swift and Objective-C
SwiftObjective-CMigrationA refactoring mishap with arithmetic expressions led me down the rabbit hole of operator precedence differences between Swift and Objective-C. Here's what to watch for.
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Defensive Coding with NSError in Objective-C
Objective-CError-HandlingBest-PracticesNSError is the standard error handling mechanism in Objective-C, but using it defensively requires more than just passing a pointer. Learn patterns that prevent crashes and make debugging easier.
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nil vs Nil vs NULL vs NSNull in Objective-C
Objective-CFundamentalsMemoryObjective-C has four ways to represent nothing. Understanding when to use each prevents subtle bugs and clarifies your code's intent.
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Key-Value Observing Deep Dive
Objective-CFoundationAdvancedKVO lets you observe property changes without delegation or notifications. Here's how it works under the hood and how to use it correctly.
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Blocks - Closures Before Swift Existed
Objective-CConcurrencyFundamentalsBefore Swift closures, Objective-C had blocks. The syntax is different, but the power is the same. Here's how to use them effectively.
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The NSObject Class Hierarchy Explained
Objective-CFoundationFundamentalsEvery Objective-C class inherits from NSObject (usually). Here's what NSObject provides and why it matters for every object you create.
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Categories vs Class Extensions in Objective-C
Objective-CFundamentalsBest-PracticesBoth let you add methods to classes, but categories and class extensions serve different purposes. Here's when to use each.
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Message Passing - The Heart of Objective-C
Objective-CRuntimeFundamentalsUnlike C++ virtual methods, Objective-C uses dynamic message passing. Understanding this mechanism unlocks the language's full power.
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Understanding Retain Cycles in Objective-C
Objective-CMemoryARCRetain cycles are the most common memory leak in Objective-C. Learn how they form, how to detect them, and patterns that prevent them.
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Namespacing in Objective-C - The Prefix Problem
Objective-CBest-PracticesArchitectureObjective-C lacks namespaces, so the community invented conventions. Here's how prefixes and other patterns help avoid collisions in a flat symbol space.
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The 10 Longest Symbol Names in Apple's Frameworks
Objective-CHumorApple-FrameworksObjective-C is famous for verbose naming. Let's celebrate (or mourn) the longest method and class names hiding in Apple's standard libraries.
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Why Objective-C Has try-catch But Nobody Uses It
Objective-CError-HandlingBest-PracticesObjective-C supports exception handling with @try/@catch, but the community settled on NSError pointers instead. Here's why.
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Ways to Shoot Yourself in the Foot with Method Swizzling
Objective-CRuntimeDebuggingSwizzling is powerful but dangerous. Here are the common pitfalls and how to avoid turning your clever hack into a debugging nightmare.
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The Power of Method Swizzling in Objective-C
Objective-CRuntimeAdvancedMethod swizzling lets you replace method implementations at runtime. Here's how it works and when this powerful technique shines.
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Class Clusters in Objective-C - The Pattern Behind Foundation
Objective-CDesign-PatternsFoundationUnderstand the class cluster pattern that makes NSString, NSArray, and NSDictionary work, and learn how to implement your own.
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NSTaggedPointerString - The Hidden Optimization You've Never Heard Of
Objective-CMemoryPerformanceDiscover how the Objective-C runtime secretly stores small strings directly in pointer values, eliminating heap allocations entirely.
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Barrier Queues in GCD - Thread-Safe Collections Without Locks
Objective-CConcurrencyGCDLearn how dispatch barrier queues provide elegant reader-writer synchronization in Objective-C without explicit locks or semaphores.
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