How do I use dynamic features (objc, selectors) safely?

Dynamic features in Swift, including Objective-C interoperability and the use of selectors, can introduce certain risks if not handled carefully. Here are some tips on how to use these features safely.

Example of Safe Use of Selectors

When using selectors in Swift, ensure that you follow these safety practices:

  • Always use `@objc` before your method declaration if it will be called through a selector.
  • Use optional chaining when calling methods dynamically to prevent crashes.
  • Check if the target can respond to the selector before invoking it.

Here's a basic example:

// Swift code example class MyClass: NSObject { @objc func myMethod() { print("Method executed safely!") } func executeDynamicMethod() { let selector = #selector(myMethod) if self.responds(to: selector) { perform(selector) } else { print("Method cannot be invoked.") } } } let myInstance = MyClass() myInstance.executeDynamicMethod()

dynamic features swift objc selectors safety in swift method invocation

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