Question 1

How do I avoid retain cycles with blocks in Objective-C?

Accepted Answer

Use weak references to self or other objects within blocks. The cheat sheet explains this by showing how to declare __weak typeof(self) weakSelf = self; to prevent memory leaks, as detailed in the Blocks section.

Question 2

What's the difference between strong and weak property attributes?

Accepted Answer

Strong increases the retain count and keeps the object alive, while weak doesn't retain and sets to nil when deallocated. The cheat sheet details this in the Properties section with examples for when to use each.

Question 3

How to implement delegation in Objective-C?

Accepted Answer

Declare a protocol with required and optional methods, set a weak delegate property, and call methods after checking respondsToSelector. The README provides a step-by-step example in the Delegation section with code snippets.

Question 4

Objective-C cheat sheet vs official Apple documentation: which is better?

Accepted Answer

The cheat sheet is faster for quick syntax reference and common patterns, but Apple's documentation offers more depth, updates, and comprehensive coverage. Use this for daily coding and Apple docs for in-depth learning.

Question 5

How to handle errors in Objective-C using NSError?

Accepted Answer

Create NSError objects with domains and codes, and pass them in failure blocks or as pointers. The Error Handling section shows how to define error constants and use them in methods, with examples for recoverable errors.

Question 6

What are categories and how do I use them in Objective-C?

Accepted Answer

Categories allow adding methods to existing classes without subclassing. The cheat sheet explains how to declare them with syntax like @interface UIImage (ResizeCrop) and implement associative references for properties, as covered in the Extending Classes section.

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