How to set NSViewShowAlignmentRects?

Question

The documentation about autolayout refers to setting NSViewShowAlignmentRects to show the alignment rects around the UIView objects in the app. I've tried setting it for Xcode, but it shows the rects for Xcode itself, not the app when it runs in the simulator.

defaults write com.apple.dt.Xcode NSViewShowAlignmentRects -bool YES

Answer 1

To do this using the scheme editor in Xcode:

• In the Xcode menu Product -> Scheme -> Edit Scheme (or ⌘-<)

• In Debug, the Arguments tab, Arguments passed on launch, click the plus button and enter this:

  -UIViewShowAlignmentRects YES (for iOS projects)
  or
  -NSViewShowAlignmentRects YES (for Mac OS projects)

• You'll need the dash at the start
• Tap OK

You should have a bunch of yellow outlines when you run

Answer 2

Add this code:

[[NSUserDefaults standardUserDefaults] setBool:YES
                                        forKey:@"UIViewShowAlignmentRects"];
[[NSUserDefaults standardUserDefaults] synchronize];

And then restart the app for it to take effect.