Simple IBAction crashes app. Why?

UnretroGamer · 01-21-2011, 03:37 PM

I assigned an IBAction to a button that all it does (for now) is an NSLog saying "Entered" like this:

Code:

- (void) enter {
	NSLog(@"Entered");
}

When I press the button in the app, the console says the following:

Code:

2011-01-21 17:30:00.495 LoL[1805:207] -[UIViewController enter]: unrecognized selector sent to instance 0x5f109f0
2011-01-21 17:30:00.497 LoL[1805:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController enter]: unrecognized selector sent to instance 0x5f109f0'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x02490b99 __exceptionPreprocess + 185
	1   libobjc.A.dylib                     0x025e040e objc_exception_throw + 47
	2   CoreFoundation                      0x024926ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
	3   CoreFoundation                      0x024022b6 ___forwarding___ + 966
	4   CoreFoundation                      0x02401e72 _CF_forwarding_prep_0 + 50
	5   UIKit                               0x002c27f8 -[UIApplication sendAction:to:from:forEvent:] + 119
	6   UIKit                               0x004ce68b -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 156
	7   UIKit                               0x002c27f8 -[UIApplication sendAction:to:from:forEvent:] + 119
	8   UIKit                               0x0034dde0 -[UIControl sendAction:to:forEvent:] + 67
	9   UIKit                               0x00350262 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
	10  UIKit                               0x0034ee0f -[UIControl touchesEnded:withEvent:] + 458
	11  UIKit                               0x002e63d0 -[UIWindow _sendTouchesForEvent:] + 567
	12  UIKit                               0x002c7cb4 -[UIApplication sendEvent:] + 447
	13  UIKit                               0x002cc9bf _UIApplicationHandleEvent + 7672
	14  GraphicsServices                    0x02d70822 PurpleEventCallback + 1550
	15  CoreFoundation                      0x02471ff4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
	16  CoreFoundation                      0x023d2807 __CFRunLoopDoSource1 + 215
	17  CoreFoundation                      0x023cfa93 __CFRunLoopRun + 979
	18  CoreFoundation                      0x023cf350 CFRunLoopRunSpecific + 208
	19  CoreFoundation                      0x023cf271 CFRunLoopRunInMode + 97
	20  GraphicsServices                    0x02d6f00c GSEventRunModal + 217
	21  GraphicsServices                    0x02d6f0d1 GSEventRun + 115
	22  UIKit                               0x002d0af2 UIApplicationMain + 1160
	23  LoL                                 0x00002024 main + 102
	24  LoL                                 0x00001fb5 start + 53
)
terminate called after throwing an instance of 'NSException'

What is wrong?

kasparp · 01-21-2011, 03:52 PM

It could be that you have not selected your own ViewController class as 'Files Owner' instead of generic UIViewController in Interface builder (its under Object identity in properties pane if you select files owner).

Edit: Actually i am not really sure, probably should'nt have answered, consider it a bump

BrianSlick · 01-21-2011, 03:57 PM

Code:

'-[UIViewController enter]: unrecognized selector sent to instance 0x5f109f0'

The object type on the left -- UIViewController -- doesn't know how to handle the message on the right -- enter.

You either have the wrong object, or the wrong message. Or potentially a memory issue.

UnretroGamer · 01-21-2011, 04:03 PM

Quote:

Originally Posted by kasparp

It could be that you have not selected your own ViewController class as 'Files Owner' instead of generic UIViewController in Interface builder (its under Object identity in properties pane if you select files owner).

Edit: Actually i am not really sure, probably should'nt have answered, consider it a bump

Nope I set the ViewController which I set the IBAction as the File's Owner. Thanks anywho.

UnretroGamer · 01-21-2011, 04:04 PM

Quote:

Originally Posted by BrianSlick

Code:

'-[UIViewController enter]: unrecognized selector sent to instance 0x5f109f0'

The object type on the left -- UIViewController -- doesn't know how to handle the message on the right -- enter.

You either have the wrong object, or the wrong message. Or potentially a memory issue.

What should I do to fix it?

BrianSlick · 01-21-2011, 04:04 PM

Send the right message to the right object.

**baja_yu** · 01-21-2011, 04:14 PM

How is 'enter' method declared in the header file? Probably as IBAction. Does it make a difference that in the implementation it void?
Check the connection in IB. Right click on file owner and see in the popup if there's anything wrong.

BrianSlick · 01-21-2011, 04:19 PM

Quote:

Originally Posted by baja_yu

How is 'enter' method declared in the header file? Probably as IBAction. Does it make a difference that in the implementation it void?
Check the connection in IB. Right click on file owner and see in the popup if there's anything wrong.

IBAction is void, it just makes the method appear in IB. If it isn't an IBAction in the .h, then you won't have access to it to make a connection anyway.

I just verified that if the .m says void while the .h says IBAction, everything works just fine.

I'm thinking the issue is along the lines of what kasparp said.

UnretroGamer · 01-21-2011, 05:08 PM

Quote:

Originally Posted by BrianSlick

IBAction is void, it just makes the method appear in IB. If it isn't an IBAction in the .h, then you won't have access to it to make a connection anyway.

I just verified that if the .m says void while the .h says IBAction, everything works just fine.

I'm thinking the issue is along the lines of what kasparp said.

Well I'm guessing Kasparp was saying to set the ViewController under File's Owner > Identity [Tab] > Class Identity > Class. Which I did, unless that's not what he was talking about...

BrianSlick · 01-21-2011, 05:08 PM

What did you set it to?

UnretroGamer · 01-21-2011, 05:27 PM

Quote:

Originally Posted by BrianSlick

What did you set it to?

The ViewController that declares the IBAction

BrianSlick · 01-21-2011, 05:28 PM

Ok.

I don't know what else to tell you that hasn't already been said.

**JasonR** · 01-21-2011, 05:37 PM

According to the error message, the IBAction is being sent to a generic UIViewController, not the one you made. I would recommend you post the following if you want help:

the .h file for your view controller class.
Exactly what you typed in for "Files Owner".
Any other code used to create this view controller.

Without more info, we have no idea what the problem could be.

UnretroGamer · 01-21-2011, 07:56 PM

Quote:

Originally Posted by BrianSlick

Ok.

I don't know what else to tell you that hasn't already been said.

[ANSWER] Oh man I figured out the problem! You guys helped me by telling me it was set to a generic View Controller. Doing some mindless digging, I went into the List View Mode in Interface Builder and all I had to do was select each view under the Tab Bar Controller and connect it to my ViewController class under the Identity tab. Not the Tab Bar Items.

......88.......
......88.......
......88.......
......88.......
......88.......
888888888
..8888888..
....88888....
......888.....
........8.......

P.S. I've loaded a view like this:

Code:

[window addSubview:mainMenuTabBarController.view];

Where mainMenuTabBarController is a tabBarController implemented in it's header file. How though, do I add a subview from a viewController class? When I try to like this:

Code:

[window addSubview:Sandbox.view];

It says obviously, 'Sandbox' undeclared. How would I about doing this? Adding a subview from a viewController class.

If you wish to answer this, I posted a thread which you can reply to here: http://www.iphonedevsdk.com/forum/ip...ler-class.html