What is a NSObject?
NSObject is the root class of all ordinary Objective C inheritance hierarchies; it’s the one class that has no superclass. It’s through NSObject that instances of all classes obtain their ability to behave as objects.
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.
What is the use of NSObject in Swift?
Subclassing NSObject in Swift gets you Objective-C runtime flexibility but also Objective-C performance. Avoiding NSObject can improve performance if you don’t need Objective-C’s flexibility.
How do I create a NSObject class in swift 4?
Well, the solution is to create a custom class. Create a new file and choose Cocoa Touch Class. Click Next and name the class “Person”, type “NSObject” for “Subclass of”, then click Next and Create to create the file. NSObject is what’s called a universal base class for all Cocoa Touch classes.
What is NSObject protocol?
The NSObject protocol defines a set of basic methods that all root classes are expected to implement. This way, code can count on those methods being there. The NSObject class conforms to the NSObject protocol, which means that the NSObject class implements these basic methods: @interface NSObject
What is Nsproxy?
An abstract superclass defining an API for objects that act as stand-ins for other objects or for objects that don’t exist yet.
Can a struct inherit from NSObject?
1) Structs are passed by value, Class instances by reference 2) Classes can be subclassed, Structs can’t. Whether or not the Class is a subclass of NSObject is (mostly) irrelevant. You could equally have said: class UserDetails { var userName:String?
What is a class in Objective-C?
In Objective-C, a class is itself an object with an opaque type called Class . Classes can’t have properties defined using the declaration syntax shown earlier for instances, but they can receive messages. Class methods are implemented in the same way as instance methods, inside the @implementation block for the class.
How do you use NSInvocation?
Think of it like sending an email. You open up a new email ( NSInvocation object), fill in the address of the person (object) who you want to send it to, type in a message for the recipient (specify a selector and arguments), and then click “send” (call invoke ). See Using NSInvocation for more information.
What is the difference between NSDictionary and NSMutableDictionary?
Main Difference is: NSMutableDictionary is derived from NSDictionary, it has all the methods of NSDictionary. NSMutableDictionary is mutable( can be modified) but NSDictionary is immutable (can not be modified).
What is the difference between NSDictionary and dictionary?
Dictionary is a native Swift struct. NSDictionary is a Cocoa class. They are bridged to one another (within the usual limits), as the docs explain very clearly and fully. It’s exactly parallel to Array and NSArray.