UITextView causing crash on load?

[evng]

I am making an app that uses a UITableView to display a list of values and when you click on one of those values it opens another view which shows editable details in a UIView that has a UITextView in it.

I can run the app and have the detail view show with out a problem but when I connect the IBOutlet binding to the textview in IB and then run it, it will crash when I click a value in the Tableview and try to display the second view with the textview.

detail.h:

#import <UIKit/UIKit.h>


@interface detail : UIViewController <UITextViewDelegate> {
	IBOutlet UITextView *textview;
}
@property (nonatomic, retain) IBOutlet UITextView *textview;

@end

detail.m:

#import "detail.h"

@implementation detail
@synthesize textview; 

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    [super viewDidUnload];
}


- (void)dealloc {
    [textview release];
    [super dealloc];
}


@end

and the code in my RootViewController.m file that launches the detail view.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:@"detail" bundle:nil];
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
}

Thanks,
evng

[SoulRed12]

One thing I do notice is that you've got a leak with the text view. You only release it once yet you have it in a property set to retain. I believe connecting it to an outlet gives it yet another retain count as well.

As for your problem though, I can't say from this code. Can you post the crash log? Specifically, run the app in debug mode (using build and debug, or cmd+option+y in Xcode), and when you get the crash, type "bt" in the console window and copy the output. (bt stands for backtrace. It'll give you the steps the app took that led up to the crash)

[evng]

Originally Posted by SoulRed12

One thing I do notice is that you've got a leak with the text view. You only release it once yet you have it in a property set to retain. I believe connecting it to an outlet gives it yet another retain count as well.

As for your problem though, I can't say from this code. Can you post the crash log? Specifically, run the app in debug mode (using build and debug, or cmd+option+y in Xcode), and when you get the crash, type "bt" in the console window and copy the output. (bt stands for backtrace. It'll give you the steps the app took that led up to the crash)

2010-09-28 09:52:10.861 UntitledApp[9357:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x6430120> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key textview.'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x0265db99 __exceptionPreprocess + 185
	1   libobjc.A.dylib                     0x027ad40e objc_exception_throw + 47
	2   CoreFoundation                      0x0265dad1 -[NSException raise] + 17
	3   Foundation                          0x000340f3 _NSSetUsingKeyValueSetter + 135
	4   Foundation                          0x00034061 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
	5   UIKit                               0x004b270a -[UIRuntimeOutletConnection connect] + 112
	6   CoreFoundation                      0x025d3d0f -[NSArray makeObjectsPerformSelector:] + 239
	7   UIKit                               0x004b1121 -[UINib instantiateWithOwner:options:] + 1041
	8   UIKit                               0x004b2eb5 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
	9   UIKit                               0x0036895f -[UIViewController _loadViewFromNibNamed:bundle:] + 70
	10  UIKit                               0x00366675 -[UIViewController loadView] + 120
	11  UIKit                               0x0036654f -[UIViewController view] + 56
	12  UIKit                               0x003649f4 -[UIViewController contentScrollView] + 42
	13  UIKit                               0x003747e2 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
	14  UIKit                               0x00372ea3 -[UINavigationController _layoutViewController:] + 43
	15  UIKit                               0x00374067 -[UINavigationController _startTransition:fromViewController:toViewController:] + 326
	16  UIKit                               0x0036eccd -[UINavigationController _startDeferredTransitionIfNeeded] + 266
	17  UIKit                               0x00375d8b -[UINavigationController pushViewController:transition:forceImmediate:] + 876
	18  UIKit                               0x0036eb67 -[UINavigationController pushViewController:animated:] + 62
	19 UntitledApp                         0x000039df -[RootViewController tableView:didSelectRowAtIndexPath:] + 146
	20  UIKit                               0x0032fa48 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140
	21  UIKit                               0x0032632e -[UITableView _userSelectRowAtIndexPath:] + 219
	22  Foundation                          0x0003b21a __NSFireDelayedPerform + 441
	23  CoreFoundation                      0x0263ef73 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
	24  CoreFoundation                      0x026405b4 __CFRunLoopDoTimer + 1364
	25  CoreFoundation                      0x0259cdd9 __CFRunLoopRun + 1817
	26  CoreFoundation                      0x0259c350 CFRunLoopRunSpecific + 208
	27  CoreFoundation                      0x0259c271 CFRunLoopRunInMode + 97
	28  GraphicsServices                    0x02f3c00c GSEventRunModal + 217
	29  GraphicsServices                    0x02f3c0d1 GSEventRun + 115
	30  UIKit                               0x002caaf2 UIApplicationMain + 1160
	31  UntitledApp                         0x00002610 main + 102
	32  UntitledApp                        0x000025a1 start + 53
)
terminate called after throwing an instance of 'NSException'

[SoulRed12]

It looks like there's an issue with interface builder (the reason being that from your stack trace, I'm seeing that there's a problem with initWithNibName, but you don't have a custom implementation of it). I'd try two things.

First, go into interface builder, and check on the lower right corner of the interface builder window where it shows you your file owner, view, first responder, etc. for either a yellow warning symbol or a red error symbol. If that's there, be sure to click it and see what it says.

Otherwise, I'd try deleting the text view, and creating it anew by dragging it from the library. Then try connecting that new text view.

[evng]

I did both options multiple times and still no avail. Any other options you know of?

Thanks for the help btw.

[SoulRed12]

According to some research (namely this thread), the particular error you're getting seems to have to do with having created a class, set IB to use that class, and then deleted the class. Have you deleted any class files recently?