gistfile1.js

- (void)_replaceSetters
{
    var rootClass = [_targetObject class],
        currentClass = rootClass;
        
    while (currentClass && currentClass != currentClass.super_class)
    {
        var methodList = currentClass.method_list,
            count = methodList.length;
            
        for (var i=0; i<count; i++)
        {
            var methodName = methodList[i].name,
                methodImplementation = methodList[i].method_imp,
                setterKey = kvoKeyForSetter(methodName);
            
            if (setterKey)
            {
                print("Replacing: "+methodName+" key: "+setterKey);
                var newMethodImp = function(self) 
                {
                    [self willChangeValueForKey:setterKey];
                    methodImplementation.apply(self, arguments);
                    [self didChangeValueForKey:setterKey];
                }
                
                if (rootClass == currentClass)
                    method_setImplementation(methodList[i], newMethodImp);
                else
                    class_addMethod(rootClass, methodName, newMethodImp, "");
            }
        }

        currentClass = currentClass.super_class;
    }
}