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I need to code in authentication information for specific parts of my website into my app. Is it at all possible for the app to be “decompiled” and the username and password exposed?
NSURL *url = [NSURL URLWithString:@"https://predefinedUsername:predefinedPassword@www.website.com"];
Yes, it is possible. Assume that if you have anything compiled into your app, it can [and will] be discovered by someone somewhere. Even if it isn’t possible today, you are creating a frozen record of such information that will be vulnerable to any future attacks, known or unknown.
You really need the user to perform some task that authenticates them. There are a million and one ways to do that, and for every one of those, a million and two ways to do it wrong. 🙂
Without knowing more about your specific requirements, it is impossible to really say much more outside of “keep it simple and don’t store or send anything in clear-text”.