Which is faster to iterate through an NSArray or an NSSet?
Yes, NSArray is faster than NSSet for simply holding and iterating. As little as 50% faster for constructing and as much as 500% faster for iterating.
What is CFData?
CFData creates static data objects, and CFMutableData creates dynamic data objects. Data objects are typically used for raw data storage. You use the CFDataCreate(_:_:_:) and CFDataCreateCopy(_:_:) functions to create static data objects. These functions make a new copy of the supplied data.
What is CFTypeRef?
The CFTypeRef type is the base type defined in Core Foundation. It is used as the type and return value in several polymorphic functions. It is a generic object reference that acts as a placeholder for other true Core Foundation objects.
What is NSArray in Objective-C?
NSArray and NSMutableArray are the Objective C array objects. In this tutorial we’ll discuss NSArray at a basic level along with various functions available in the class. NSArray help us in creating static array in Objective C programming. Earlier we looked into NSNumber and NSString NSArray is Objective-C’s general-purpose array type.
How do I access NSArray values?
In addition to the provided instance methods, such as object (at:), you can access NSArray values by their indexes using subscripting. There is typically little reason to subclass NSArray. The class does well what it is designed to do—maintain an ordered collection of objects.
How do I override primitive instance methods of an NSArray?
Any subclass of NSArray must override the primitive instance methods count and object (at:). These methods must operate on the backing store that you provide for the elements of the collection. For this backing store you can use a static array, a standard NSArray object, or some other data type or mechanism.
How do I make a subclass of an NSArray?
Remember that NSArray is the public interface for a class cluster and what this entails for your subclass. You must provide the storage for your subclass and implement the primitive methods that directly act on that storage. Before making a custom subclass of NSArray, investigate NSPointerArray and the corresponding Core Foundation type, CFArray.