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PO"'NSInvalidArgumentException', reason: '-[UIButton intValue]: unrecognized selector sent to instance" between initwithNibName: and viewDidLoad
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copied!<p>I have a fairly simple app (my first non-trivial iOS app) which I've been working on for some time. I've gotten the app finished and working, but I decided earlier today to refactor it to better fit OO design principles (in the interest of simplicity I had put most of my application in to the main view controller; I went back to try to split it out in to a second class). Now, whenever I try to run my app, I get a crash with the following error before my main view loads:</p> <pre><code>IntervalPlayer[1374:907] -[UIButton intValue]: unrecognized selector sent to instance 0x1c5569d0 </code></pre> <p>By throwing print statements everywhere, I can tell that I get through initWithNibName:bundle: OK, but the app crashes before viewDidLoad is called. Clearly something in my code is trying to call intValue on a UIButton, but there's nothing in my code that would do that - I only use intValue once in the entire app, and I get the same error when I comment that line out. In fact, I've tried commenting out everything in initWithNibName:bundle: after the call to the superclass constructor, and I'm getting the same error at the same place. So in other words, as best I can tell, something in an empty constructor is causing intValue to be called on a UIButton before anything else in my app has a chance to run. I assume its something in the delegate or nib, but I've looked through both and I haven't seen anything out-of-the-ordinary. Has anyone out there ever run in to something like this?</p> <p>Forgive the lack of code snippets, I'm not sure what I would provide to illustrate this. Here's the empty constructor, with which the error is still occurring:</p> <pre><code>- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)aBundle { self = [super initWithNibName:(NSString *)nibName bundle:(NSBundle *)aBundle]; if (self) { } return self; } </code></pre> <p>If anyone can suggest any other code to add, I'll edit the question to do so.</p> <p>Thanks,</p> <p>Dan</p> <p>EDIT: Yes, I am using ARC. Also, to clarify, this is occurring in my main view controller and I haven't touched the delegate. </p> <p>EDIT 2: The crash is in my delegate; according to the debugger the problem line is [self.window makeKeyAndVisible]; Since I haven't touched the delegate, my guess would be the NIB is somehow invalid.</p> <p>FINAL EDIT: By deleting buttons until I found the one causing the crash, then hooking it back up to everything it was hooked up to in the view controller, I found that it was crashing when the button was connected to a UIButton outlet, and not crashing when it wasn't. I removed the outlet, re-made it, and now it works. So I have no clue what happened, but somehow I fixed it. Many thanks to everyone who made suggestions!</p>

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