Generic function to exchange function

Swizzling.swift

 let swizzling: (AnyClass, Selector, Selector) -> Void = { forClass, originalSelector, swizzledSelector in
    guard
        let originalMethod = class_getInstanceMethod(forClass, originalSelector),
        let swizzledMethod = class_getInstanceMethod(forClass, swizzledSelector)
        else { return }
    method_exchangeImplementations(originalMethod, swizzledMethod)
}