Me and my team, have high experience in writing good, maintainable, and modular code. We actually work for a company here in Bucharest, Romania, doing exactly native iOS apps for both iPhone and iPad. The bid I proposed is totally random, as you have not given any details about your project. If we would work together, we will first need to understand what you have in mind, see what resources you can give us, such as a wireframe for the app, the user interface elements, and analyze the entire complexity of the app, and after that we can talk about how much time it will take and how many people will work on it and how much money.
If you would like, We could send you our linkedin profiles so that you have a better understanding of what we can do.
Waiting for your answer,
Alexandru Popa