How to edit an Xcode project based on running a static library?

Question

iOS

There is software that generates an Xcode project.
An Xcode project consists of this main:
int main(int argc, char *argv[])
{
startApp(argc, argv);
}
That is, it immediately starts the static library included in the project. There is no App Delegate in the project.
Question:
is it possible to somehow run your code before running this library?
What other options are there to customize such an Xcode project?

Answer 1

1) Да, вставить код перед вызовом библиотеки.
2) Читать о Objc-C Runtime и method swizzling.

Answer 2

Я правильно понял, что swizzling подменяет функцию своей ? То есть, например, я подменю ViewDidLoad на свою, но оригинальная не будет выполнена ?