Does NSArray retain objects?
Some collection classes such as NSArray automatically retain objects when you add them into an array and release them when either the object is removed (mutable objects only) or when the collection is released.
What is NSMutableArray in Swift?
Overview. The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects. This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray .
What is NSMutableArray in Objective C?
NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects. NSArray is immutable, so we cannot dynamically add or remove items.
When we use NSArray?
NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays. You can use arrays when you need an ordered collection of objects. NSArray is “toll-free bridged” with its Core Foundation counterpart, CFArray .
What is nsmutablearray and what does NSArray do?
NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays. You can use arrays when you need an ordered collection of objects.
Do you have to override primitive instance methods in 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 does the NSArray class work in Objective C?
For more information about object literals in Objective-C, see Working with Objects in Programming with Objective-C. In Swift, the NSArray class conforms to the ArrayLiteralConvertible protocol, which allows it to be initialized with array literals.
Is there way to subclass NSArray in Swift?
For more information about object literals in Swift, see Literal Expression in The Swift Programming Language (Swift 4.1). 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.
