What is NSNumber?

NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .

What is NSTaggedPointerString?

NSTaggedPointerString is about the dynamic type of the object. Your issue is about the type you have written in your source code. – Catfish_Man. Apr 6, 2016 at 17:16. 1.

What does super mean in Objective-C?

Super is self , but when used in a message expression, it means “look for an implementation starting with the superclass’s method table.”

What is NSData in iOS?

Overview. NSData and its mutable subclass NSMutableData provide data objects, or object-oriented wrappers for byte buffers. Data objects let simple allocated buffers (that is, data with no embedded pointers) take on the behavior of Foundation objects.

What is super viewDidLoad ()?

In ‘[super viewDidLoad]’, ‘super’ means the same object as ‘self’, so the class of this ‘super’ is B. However, by using ‘super’, you’re telling the compiler that you do not want to invoke class B’s ‘viewDidLoad’ method, but its superclass’s ‘viewDidLoad’. That means UIView’s viewDidLoad, not A’s.

What is Self in Swift?

In Swift, the self keyword refers to the object itself. It is used inside the class/structure to modify the properties of the object. You can assign initial values to properties in the init() method via self.

Is Objective-C dead?

While there aren’t any major shifts in programming language popularity this month, the TIOBE Index for February 2020 addresses the decline of Objective-C. For many, this language is long dead and spoken with the same nostalgia as dinosaurs such as COBOL and Fortran.

Is Objective-C better than Swift?

Objective-C has a superior runtime compared to Swift. It’s probably going to be several years before Swift can catch up. If you’re using powerful SDKs, Objective-C is also your best option here as well. I’d still recommend that new developers start off learning Swift.