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Languages & runtimes · #objectivec
Learn how to resolve EXC_BAD_ACCESS crashes in Objective-C by using Zombie Objects to identify dangling pointers and fixing improper reference types.
Learn how enabling ARC per file simplifies Objective‑C memory management, reduces boilerplate, and what limits to watch for when mixing ARC with manual retain/release.
Learn how to build a thread‑safe singleton in Objective‑C with GCD’s dispatch_once, including verification steps and failure‑mode analysis.
ARC simplifies memory management in Objective-C, but it cannot prevent retain cycles. Learn how to use strong and weak references to break circular dependencies and prevent memory leaks.
Learn how to use Objective-C's dynamic runtime to modify class behavior at execution time using Method Swizzling, and how to avoid common pitfalls like infinite recursion.
Integrating Objective-C dynamic dispatch with Swift requires a balance between the flexibility of objc_msgSend and Swift's static optimization. While the @objc attribute exposes Swift members to the runtime, using @objc dynamic forces the use of the Objective-C message-sending mechanism for method invocation. A design uncertainty arises when implementing run
Auto Layout vs. Manual Layout for Dynamic Type Support in Custom UI Elements Goal: Make a custom component adjust its size and content when the user changes the system font size via Dynamic Type. The component contains multiple labels and icons that must remain legible and properly spaced. Constraint: Auto Layout automatically respects intrinsicContentSize a
Updating the Xcode SDK often necessitates changes to the project's Deployment Target to maintain compatibility with new API requirements. However, Objective-C projects utilizing CocoaPods manage these targets across multiple configuration files, including the main project settings and the Podfile. When the SDK is upgraded, a discrepancy can emerge between th
In iOS 10+, UNUserNotificationCenter replaces UILocalNotification and introduces categories, actions, and UNNotificationPresentationOptions for fine‑grained control over how alerts appear. Developers often use silent pushes (content‑available = 1) to wake the app in the background, but the interaction between these silent notifications and the banner/alert p
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