Allegion IOS Developer Interview Questions and Answers

Retain, weak, strong, atomic are property attributes in Objective-C for memory management and thread safety.

• Retain: Increases the reference count of an object.

• Weak: Does not increase the reference count, used to avoid retain cycles.

• Strong: Increases the reference count and keeps the object in memory until all references are removed.

• Atomic: Guarantees that the value is always fully retrieved or set in a multi-threaded e

ARC (Automatic Reference Counting) is a memory management feature in Objective-C that automatically manages memory for objects.

• ARC automatically inserts retain, release, and autorelease calls at compile time to manage memory.

• It helps prevent memory leaks and makes memory management easier for developers.

• Example: 'NSString *name = [[NSString alloc] initWithString:@"John"];' - ARC will automatically handle memory managem