Xcode Interface Builder wont start

I have a relatively confusing problem: I created several empty Xcode projects and ran the iPhone and iPad emulators just to see what happens and everything is fine, empty, but fine. However, then I decided to actually add some content but when I double click my .xib file nothing happens. The Xcod开发者_JAVA百科e loses focus, but nothing opens. The Interface Builder simply does not open.

Do I need to start it separately somehow or do I need to download and install it separately or something else altogether?

I had the same problem when i first installed xcode.

What solved it for me was manually starting the Interface Builder once (via spotlight).

After that it worked again by double clicking on the xib file in xcode....

The most common cause of this in my experience is failure to reboot after installing or upgrading Xcode. Xcode gives you the impression that you don't need a reboot, but in practice you do. Have you done this yet?

Try to search for interface builder in Mac OS search bar on the top right of the screen, open it, click on open existing file. Open any xib file once, then it will be automatically detectedd by xCode.