xcode 6 interface builder very slow performance when showing viewcontrollers with constraints

Question

I have an problem with Xcode 6 really responding very slowly to user interactions, e.g. editing code, scrolling areas etc. This particularly happens when the interface builder s

Answer 1

I had this same problem where performance plummeted on an external display.

What I ended up discovering was that the external monitor issue was indicating that there was a UIView that interface builder couldn't quite figure out properly for auto-layout.

In my case it was a UIToolbarBarItem that contained a UIView that contained a UILabel. Once I removed the offending UIToolbarBarItem the performance issue resolved itself. It went from being completely unusable to smooth scrolling.

You should check if you have a UIView inside something that might cause auto-layout to freak out.

Answer 2

Do you use an external monitor? If yes, probably that's the problem. Try moving to the main macbook screen and try again.

That solved the problem for me.

EDIT: sorry, just read you have an external monitor. So yes, move to the main screen and check if that solves the problem.

EDIT 2: seems like Apple fixed the problem, no more issues using my external monitor!

EDIT 3: meh! Problem persists, not sure why it stopped happening, and happens again now.

Answer 3

Wow, thanks so much guys! I was having a huge problem with Xcode being slowed to a crawl while I was modifying interface elements in the interface editor. All I had to do was uncheck "Use Auto Layout" under the .xib's File Inspector tab, and it's running faster than ever!

So if you have any problems with Xcode's interface editor / Interface Builder being slow, just disable Auto Layout for that .xib while you're working on it, then when you're done editing the .xib, as a final step, re-enable it and add your constraints to the items.