When XCode outputs an error like <code>'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]:etc.</code>, how can I find the line of code with that objectAtIndex code?

Create a new Exception breakpoint. It will usually show you where the exception is first thrown. Go to the Breakpoints tab on the left: <img src="https://i.stack.imgur.com/837iN.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/rQAoi.png" alt="enter image description here">