In Objective-C, retain counts are the way in which memory is managed in Objective-C. When you create an object, it has a retain count of 1. When you send an object a (...) message, its retain count is incremented by 1. When you send an object a (...) message, its retain count is decremented by 1.

A derived class can access all the private members of its base class if it's defined in the interface class

Which one is correct (legal) floating-point literal ?

What happens when the following code executes?

Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the (...) programming language

While calling a function by reference, it will copy the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument. Is the statement above True ?

Which of the following statements is correct?

What сan you use to avoid msgSend function overhead?

What happens if two categories define methods with the same names for the same class?

What happens at runtime with the following: NSMutableString *tempString = [NSMutableString stringWithString:@"1"]; dispatch_sync(dispatch_get_main_queue(), ^{ [tempString appendString:@"2"]; NSLog(@"%@", tempString); }); [tempString appendString:@"3"];

A UIView is a superclass of: