How to addSubview with a position?

I have something like this:

myViewController = [[MyViewController alloc] initWithNibName:@"MyView" bundle:nil];
[mainCanvas addSubview: myViewController.view];
self.view = mainCanvas;

It will be added at the position (0, 0), but I want to add it at (0, 100) or somewhere else. How can I do so?