IB_DESIGNABLE, IBInspectable -- Interface builder does not update

Based on chrisco's suggestion to debug the selected view (which I had already done, but went to try again for good measure), I noticed a couple of other options at the bottom of the Editor menu.

• Automatically Refresh Views
• Refresh All Views

I clicked "Refresh All Views" and after Xcode had a bit of a think, suddenly the storyboard was displaying my view as expected (properly applying my IBInspectable properties).

I then went through the whole process again to confirm that this is the solution.

I created a new class, ThirdView. This class is identical to the others, again. I changed my view's class to ThirdView and got something slightly different this time:

Clicking "Show" to me to the warnings:

A new one this time:

Using class UIView for object with custom class because the class ThirdView does not exist.

This isn't really any more helpful than what already existed. Plus, now the other three warnings have doubled into 6 strangely.

Anyway, if I click "Refresh All Views" from the Editor drop down menu again, all the errors go away, and once again, the view properly displays.

Still, up to this point, everything I did was stuff I never messed with at home. At home, it just worked. So I turned on "Automatically Refresh Views" and created a "FourthView" to test--once again, identical to the first three.

After changing the view's class to "FourthView" the designables label said "Updating" for a short moment then finally said "Up to date":

So, I checked my computer at home. "Automatically Refresh Views" is turned on at the computer that was always working. It was turned off at the computer that wasn't. I don't ever remember touching this menu option. I can't even tell you for sure whether it existed before Xcode 6. But this option is what was making the difference.

TL;DR, if you're having the same problem described in the question, make sure "Automatically Refresh Views" is turned on (or manually "Refresh All Views" when you need an update in IB):

I have a few more details that may cause your IBDesignable classes to not be loaded.

Select your problematic storyboard/xib where your custom views ought to display.

In the navigator area, head to the Report Navigator in your XCode workspace/project.

In the Editor menu of XCode, hit (as mentioned by nhgrif), the "Refresh All Views" option. This will cause IB to launch a compile for a whole bunch of stuff that you, I'm certain, would not expect.

In the Report Navigator, Click on "By Group" to filter content and look at the "Interface Builder" section. You will see that for the sake of loading the custom IBDesignable views framework, it will compile LOTS of things. If any of these targets do NOT compile, such as (perhaps deprecated) unit test targets (even if they are totally unrelated to the code that loads these views or storyboard), then IB will fail at loading your dll.

In my case, IB tried to compile 8 targets, including 4 that where unit tests that had not been updated since recent refactoring changes we've been working on.

Most of the code changes/fixes I have done in order for IB to properly load and display my customs views where not related or even linked against these classes, nor would it ever load the storyboard in the course of running these unit tests. Yet, IB had a dependency on the whole workspace compiling for it to work.

Just a quick hint for anyone else having this problem: remember to specify the type of the variable.

// Doesn't show up in IB@IBInspectable var includeLeftSection = true// Shows now that it knows the type@IBInspectable var includeLeftSection : Bool = true