Example of Objective-C's Runtime method_exchangeImplementations for method swizzling

HCSwizzle.m

+ (void)load
{
    Method original, swizzled;
    
    original = class_getInstanceMethod(self, @selector(original_method));
    swizzled = class_getInstanceMethod(self, @selector(swizzled_method));
    method_exchangeImplementations(original, swizzled);
}