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Editorial Team
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Asked: 2026-06-05T08:45:32+00:00

I started my app with the master-detail template. I simply added two other VCs

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I started my app with the “master-detail” template. I simply added two other VCs and changed the “initial view controller” checkbox to “Safety Culture MainVC”…when I run, my app crashes…

What do I need to do?!

This is a screenshot of the default storyboard with my two other VCs thrown in–they work when the “Navigation Controller” is the default.

Clearly, I’m a beginner, so as much detail as you can give me is helpful!!
Thanks!

Storyboard

Debug Output:

2012-06-07 10:38:42.812 SafetyCulture[1020:fb03] -[safetyCultureMainVC
topViewController]: unrecognized selector sent to instance 0x6b7c210
2012-06-07 10:38:42.840 SafetyCulture[1020:fb03] * Terminating app
due to uncaught exception ‘NSInvalidArgumentException’, reason:
‘-[safetyCultureMainVC topViewController]: unrecognized selector sent
to instance 0x6b7c210’
* First throw call stack: (0x16ae022 0x183fcd6 0x16afcbd 0x1614ed0 0x1614cb2 0x2619 0x17386 0x18274 0x27183 0x27c38 0x1b634 0x1598ef5
0x1682195 0x15e6ff2 0x15e58da 0x15e4d84 0x15e4c9b 0x17c65 0x19626
0x22ed 0x2255) terminate called throwing an exception(lldb)

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1 Answer

  1. Editorial Team

    topViewControlleris a method of a UINavigationController. You app tries to call this method and since it is not there it crashed.

    In your image your entry point arrow is still on the navigation controller:

    enter image description here

    Move it via drag&drop to your safetyCultureMainVClike this:
    enter image description here

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