When I’m working on iOS projects using Objective-C, I frequently need to work with collections of objects. Apple gives us two main array classes: NSArray and NSMutableArray. While they’re closely related, understanding their differences has been crucial for writing effective code. NSArray: NSArray is…

1. Category  Category in Objective-C allows you to add new methods (instance and class methods) to an existing class, even if you don’t have the source code for that class. Categories provide a powerful way to extend the behavior of system or third-party…

1. assign Difficulty: Using assign for objects can cause dangling pointers if the assigned object is deallocated. If subtitle is deallocated elsewhere, this property will point to invalid memory, leading to a crash. 2. strong ARC Behavior: Difficulty: Can cause…

Objective-C properties can be declared as either atomic (the default) or nonatomic. Understanding the distinction is critical, especially for multithreading and performance implications in iOS/macOS development. Atomic Example: Nonatomic Example: Key Points: In summary:Use atomic only if you have a very specific need for atomicity in…