Note: this example has been updated for Swift 5

This is an example on how to use mach_override in a Swift Application.

More explanations at this post: http://www.lombax.it/?p=321

For details, look inside main.swift, there are:

2 plain function a class called TestClass with 2 instance methods

Before calling the two functions, I call

override()
override_instance_method()

that are declared inside the override.c file.

These functions replaces the implementation of:

• the plain function original() with exchanged()
• the instance method of TestClass : original() with exchanged()

to see in action, simply execute the app.

Comment

//override()
//override_instance_method()

to come back to the original implementation