Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol. The methods under keyword (...) must be implemented in the classes that conform to the protocol and the methods under (...) keyword are optional to implement.

 

In Objective-C, retain counts are the way in which memory is managed.

Memory management is one of the most important processes in any programming language

Which one is NOT correct regarding memory management in Objective-C ?

Which one contains an INCORRECT concept regarding Objective-C programming ?

The (...) is an Objective-C directive, which is also used to define the aliases for various data types similar to (...). But (...) is limited to giving symbolic names to types only, whereas (...) can be used to define alias for values as well, like you can define 1 as ONE, etc.

A UITableViewController's tableview must have its delegate explicitly set by the developer.

How to restore Consumable In-App Purchases?

What is the last chance for an object to handle a message?

What can you say about the code: NSString * str = [NSString stringWithFormat:@""]; [str release];

What happens at runtime with the following: dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_apply(10, queue, ^(size_t index) { NSLog(@"%zu", index); });