A project I've started helping on did not use Auto Layout before and I'm updating it to use Auto Layout and size classes. There's a decent amount of frame manipulation code throughout the app (e.g. setting frame directly rather than changing constraint constants), and I'm wondering how this affects a view that's been set up with Auto Layout constraints.
I'm working on doing away with the frame-changing portions of code and changing it to update constraint constants where needed, but since I'm not yet 100% familiar with how every piece of the code works, it'd be helpful to have a better understanding of how auto layout and coded frame changes can affect each other so that if a view doesn't appear properly at runtime I can better determine if it's something I set up or perhaps a piece of older code somewhere that needs to be found and updated.