What is NS Data?
A static byte buffer that bridges to Data ; use NSData when you need reference semantics or other Foundation-specific behavior.
What is the difference between string and NSString?
NSString is the abstract base class for a cluster of classes representing strings. Its interface does not include any methods to change the string contents after initialization. NSMutableString is the abstract base class for a cluster of classes representing strings whose contents can be changed.
What does NSObject mean?
The NSObject defines all things that are shared between all classes that extend from it: NSObject is the root class of most Objective-C class hierarchies. Through NSObject, objects inherit a basic interface to the runtime system and the ability to behave as Objective-C objects.
What is an NSString?
(NSString *) is simply the type of the argument – a string object, which is the NSString class in Cocoa. In Objective-C you’re always dealing with object references (pointers), so the “*” indicates that the argument is a reference to an NSString object.
Where is NSObject defined?
What kind of class is NSObject?
The root class of most Objective-C class hierarchies, from which subclasses inherit a basic interface to the runtime system and the ability to behave as Objective-C objects.
Do all Swift classes inherit from NSObject?
You don’t have to inherit from NSObject in Swift, but you did in Objective-C and in fact there are some behaviors you can only have if you do inherit from it.
What is a NSObject?
What is AnyObject Swift?
Any and AnyObject are two special types in Swift that are used for working with non-specific types. According to Apple’s Swift documentation, Any can represent an instance of any type at all, including function types and optional types. AnyObject can represent an instance of any class type.
What is NSObject protocol?
This protocol is imported into Swift with the name NSObjectProtocol . An object that conforms to this protocol can be considered a first-class object. Such an object can be asked about its: Class, and the place of its class in the inheritance hierarchy.
Can Objective-C class inherit from Swift class?
Unfortunately, it’s not possible to subclass a Swift class in Objective-C. Straight from the docs: You cannot subclass a Swift class in Objective-C.
What is the difference any and AnyObject?
Is AnyObject a protocol?
AnyObject is a protocol to which all classes implicitly conform. In fact, the standard library contains a type alias AnyClass representing AnyObject. Type . You can use AnyObject if you need the flexibility of an untyped object.
What is an NSObject?