SwizzleFunction

SwizzleFunction.swift

static func swizzle() {
    let aClass: AnyClass? = object_getClass(SomeClass())
    
    let selector1: Selector = #selector(SomeClass.someMethod)
    let selector2: Selector = #selector(SomeClass.someOtherMethod)

    let method1: Method? = class_getInstanceMethod(aClass, selector1)
    let method2: Method? = class_getInstanceMethod(aClass, selector2)

    if let originalMethod = method1, let swizzledMethod = method2 {
        method_exchangeImplementations(originalMethod, swizzledMethod)
    }
}