MacOS app does not run on the Xcode simulator

Question

I\'ve installed Xcode 4.2.1 on Mac OS X Lion.

When I create a new (Mac OS X Cocoa) project and I click \"Run\", Xcode says build succeeded, but does

Answer 1

I had the same issue in late 2017 with Xcode 9.2.

I had to uncheck 'Debug Executable' and then my app was able to both run and stop.

You can open the settings by clicking Product -> Scheme -> Edit Scheme...

Answer 2

Simple

Select the desired active scheme and device/simulator from the toolbar (next to the "play" and "stop" buttons).

The scheme selection should look something like below where the name is that of the appropriate target.

Answer 3

I had similar problems. I found that the problem was in ~/.gdbinit file. And a second time - at the window initialization function loadWithNibName/initWithWindow (wrong name nib file or frame properties). Also check the file Info.plist in your project (parameters "Main nib file base name" and "Principal class").

Answer 4

Try removing the dev tools by running

sudo Developer/Library/uninstall-devtools --mode=all

in Terminal. This will properly remove all components of the dev tools, including the command-line components.

You can then try a re-install.