What is an OBJC function Swift?

@objc means you want your Swift code (class, method, property, etc.) to be visible from Objective-C. dynamic means you want to use Objective-C dynamic dispatch.

Is Swift dynamic or static?

Swift itself, is statically typed. When used with Cocoa, you get access to the objective-c runtime library which gives you the ability to use dynamic classes, messages and all.

What is dynamic dispatch in Swift iOS?

Like many other languages, Swift allows a class to override methods and properties declared in its superclasses. This technique, called dynamic dispatch, increases language expressivity at the cost of a constant amount of runtime overhead for each indirect usage.

What is the @objc attribute?

That’s where the @objc attribute comes in: when you apply it to a class or method it instructs Swift to make those things available to Objective-C as well as Swift code. …

Why do we need @ObjC?

Most of the time it happens when you are sub classing a Swift class of Objective-C base class. A Swift class or protocol must be marked with the @objc attribute to be accessible and usable in Objective-C. This attribute tells the compiler that this piece of Swift code can be accessed from Objective-C.

What does ObjC linker flag do?

The -ObjC Linker Flag Passing the -ObjC option to the linker causes it to load all members of static libraries that implement any Objective-C class or category. This will pickup any category method implementations. But it can make the resulting executable larger, and may pickup unnecessary objects.

What is dynamic in Swift?

Dynamic dispatch. It simply means that the Objective-C runtime decides at runtime which implementation of a particular method or function it needs to invoke. Swift uses the Swift runtime whenever possible. The result is that it can make a number of optimizations.

What is dynamic keyword Swift?

Using dynamic tells Swift to always refer to Objective-C dynamic dispatch. This is required for things like Key-Value Observing to work correctly. When the Swift function is called, it refers to the Objective-C runtime to dynamically dispatch the call.

What is the dynamic keyword used for Swift?

dynamic is a declaration modifier that you can apply to either function or variable declarations. It can only be used within a class and it tells the compiler to use dynamic dispatch over static dispatch.

What is linker in iOS?

Xamarin Linker is used in iOS and Android projects, to remove unused code from compiled assemblies. This helps reduce the final size of the apk or ipa. However, it is often too aggressive, and starts stripping away methods and fields you are using. This is common, if methods are only referenced by reflection.

Why do we use @objc?