How objc runtime works?

The Objective-C runtime is a runtime library that provides support for the dynamic properties of the Objective-C language, and as such is linked to by all Objective-C apps. Objective-C runtime library support functions are implemented in the shared library found at /usr/lib/libobjc.

How objc runtime works?

The Objective-C runtime is a runtime library that provides support for the dynamic properties of the Objective-C language, and as such is linked to by all Objective-C apps. Objective-C runtime library support functions are implemented in the shared library found at /usr/lib/libobjc.

Does Swift use objc runtime?

Swift itself is a stand alone language that is fully independent of Objective-C. You can see this today by using non-Apple platforms like Linux, which do not include or use the Objective-C ecosystem or runtime at all.

What is objc_setAssociatedObject?

objc_setAssociatedObject adds a key value store to each Objective-C object. It lets you store additional state for the object, not reflected in its instance variables. It’s really convenient when you want to store things belonging to an object outside of the main implementation.

What is an associated Object?

Associated Objects is part of Objective-C runtime. It allow you to associate objects at runtime. Simply, you can attach any object to any other object without subclassing.

Is C++ faster than Objective-C?

Objective-C is slower than C/C++. The reason being the runtime of Objective-C which dispatches methods lookups dynamically at runtime the same way as Smalltalk, from which it has taken over this execution model.

Is Swift ABI stable?

It’s been a chronic goal to stabilize Swift’s ABI on macOS, iOS, watchOS, and tvOS. The eventual benefit to the Swift ecosystem to enable binary compatibility for apps and libraries, as long as stable ABI is an important milestone for the maturity of any language.

What is a programming runtime?

Runtime is a piece of code that implements portions of a programming language’s execution model. In doing this, it allows the program to interact with the computing resources it needs to work. Runtimes are often integral parts of the programming language and don’t need to be installed separately.

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.