What is @objc?
Even if it may seem confusing when you see it for the first time, @objc is just an attribute that allows us iOS developers to make our Swift code accessible in Objective-C.
It can be applied to methods, properties, classes, etc.
@objc func doSomething() {}
For example, placing @objc before the doSomething() method will make it available in Objective-C and the Objective-C runtime.
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