CODEWITHSUNDEEP
iosobjective-c
Sakura1108
Sakura1108

Reputation: 23

UIAlertView show crash

I make an UIAleartView show information when first init:

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@""
                                                    message:@"..."
                                                   delegate:self
                                          cancelButtonTitle:@"..."
                                          otherButtonTitles:@"...", nil];
alertView.tag = 1;
[alertView show];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    switch (alertView.tag) {
        case 1: {
            [UICKeyChainStore setString:@"YES" forKey:kDebutFirstMsgShow];
            if (buttonIndex == 0) {
                NSNotificationCenter *noti = [NSNotificationCenter defaultCenter];
                [noti postNotificationName:@"...." object:nil];
            }
            break;
        }

        default:
            break;
    }
}

And here is log:

2017-02-10 01:16:44.206 audition[1740:55532] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010b09bd4b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x000000010aad421e objc_exception_throw + 48
    2   CoreFoundation                      0x000000010afcd2eb -[__NSArrayM objectAtIndex:] + 203
    3   UIKit                               0x0000000109854e8f __86-[_UIAlertControllerView _unlocalizedOrderedPresentableAlertActionViewRepresentations]_block_invoke + 68
    4   CoreFoundation                      0x000000010b02b0b2 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 114
    5   CoreFoundation                      0x000000010b02af42 -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 194
    6   UIKit                               0x0000000109854dfc -[_UIAlertControllerView _unlocalizedOrderedPresentableAlertActionViewRepresentations] + 213
    7   UIKit                               0x00000001098543b5 -[_UIAlertControllerView _reloadInterfaceActionViewRepresentations] + 50
    8   UIKit                               0x0000000109855f6e -[_UIAlertControllerView _setVisualStyle:] + 380
    9   UIKit                               0x00000001090bab35 -[UIAlertController _updateProvidedStyleWithTraitCollection:] + 455
    10  UIKit                               0x00000001090bac0f -[UIAlertController _updateProvidedStyle] + 57
    11  UIKit                               0x00000001090bae7a -[UIAlertController traitCollectionDidChange:] + 236
    12  UIKit                               0x0000000108eedfac -[UIViewController _traitCollectionDidChange:] + 108
    13  UIKit                               0x0000000108eee0cf -[UIViewController _updateTraitsIfNecessary] + 269
    14  UIKit                               0x0000000108e12957 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 884
    15  QuartzCore                          0x000000010bb2abf8 -[CALayer layoutSublayers] + 146
    16  QuartzCore                          0x000000010bb1e440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
    17  UIKit                               0x0000000108e00928 -[UIView(Hierarchy) layoutBelowIfNeeded] + 1509
    18  UIKit                               0x0000000108df6e33 -[UIView(Geometry) setBounds:] + 2387
    19  UIKit                               0x0000000108df603d -[UIView(Geometry) _applyISEngineLayoutValuesToBoundsOnly:] + 608
    20  UIKit                               0x0000000108e0080e -[UIView(Hierarchy) layoutBelowIfNeeded] + 1227
    21  UIKit                               0x0000000108df315b -[UIView(Geometry) setFrame:] + 1297
    22  UIKit                               0x00000001090b9f26 -[UIAlertController loadView] + 201
    23  UIKit                               0x0000000108eef61c -[UIViewController loadViewIfRequired] + 201
    24  UIKit                               0x0000000108eefe70 -[UIViewController view] + 27
    25  UIKit                               0x0000000108f0a0a5 -[UIViewController _setPresentationController:] + 100
    26  UIKit                               0x0000000108f015f4 -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1355
    27  UIKit                               0x0000000108f0328e -[UIViewController _presentViewController:withAnimationController:completion:] + 4971
    28  UIKit                               0x0000000108f0626b -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 530
    29  UIKit                               0x0000000108f05d51 -[UIViewController presentViewController:animated:completion:] + 179
    30  UIKit                               0x00000001098413bf -[_UIAlertControllerShimPresenterWindow presentAlertController:animated:completionBlock:] + 642
    31  UIKit                               0x000000010983f6f6 -[_UIAlertControllerShimPresenter _presentAlertControllerAnimated:completion:] + 219
    32  UIKit                               0x00000001090d42e6 -[UIAlertView _showAnimated:] + 278
    33  audition                            0x00000001063f9840 -[DebutVC viewWillAppear:] + 448
    34  UIKit                               0x0000000108ef596f -[UIViewController _setViewAppearState:isAnimating:] + 692
    35  UIKit                               0x0000000108ef607f -[UIViewController __viewWillAppear:] + 147
    36  UIKit                               0x0000000108e0b59b __86+[UIView(Internal) _transitionFromView:toView:duration:options:animations:completion:]_block_invoke + 62
    37  UIKit                               0x0000000108e085c0 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 581
    38  UIKit                               0x0000000108e087f2 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:animations:start:completion:] + 145
    39  UIKit                               0x0000000108e0b4bf +[UIView(Internal) _transitionFromView:toView:duration:options:animations:completion:] + 603
    40  UIKit                               0x0000000108f1677a -[UIViewController(UIContainerViewControllerProtectedMethods) transitionFromViewController:toViewController:duration:options:animations:completion:] + 771
    41  audition                            0x000000010645c1b1 -[MHTabBarController setSelectedIndex:animated:] + 2849
    42  audition                            0x000000010645cca3 -[MHTabBarController tabButtonPressed:] + 99
    43  UIKit                               0x0000000108d4f8bc -[UIApplication sendAction:to:from:forEvent:] + 83
    44  UIKit                               0x0000000108ed5c38 -[UIControl sendAction:to:forEvent:] + 67
    45  UIKit                               0x0000000108ed5f51 -[UIControl _sendActionsForEvents:withEvent:] + 444
    46  UIKit                               0x0000000108ed4910 -[UIControl touchesBegan:withEvent:] + 304
    47  UIKit                               0x0000000108dbd285 -[UIWindow _sendTouchesForEvent:] + 2043
    48  UIKit                               0x0000000108dbec33 -[UIWindow sendEvent:] + 4011
    49  UIKit                               0x0000000108d6b9ab -[UIApplication sendEvent:] + 371
    50  UIKit                               0x000000010955872d __dispatchPreprocessedEventFromEventQueue + 3248
    51  UIKit                               0x0000000109551463 __handleEventQueue + 4879
    52  CoreFoundation                      0x000000010b040761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    53  CoreFoundation                      0x000000010b02598c __CFRunLoopDoSources0 + 556
    54  CoreFoundation                      0x000000010b024e76 __CFRunLoopRun + 918
    55  CoreFoundation                      0x000000010b024884 CFRunLoopRunSpecific + 420
    56  GraphicsServices                    0x000000010ca64a6f GSEventRunModal + 161
    57  UIKit                               0x0000000108d4dc68 UIApplicationMain + 159
    58  audition                            0x0000000106493c91 main + 241
    59  libdyld.dylib                       0x000000010d05868d start + 1

From the log file NSRangeException there is an array empty but i access to element 0 of it. But Crash disappear when i comment [alertview show]; What is reason of this crash ?

Upvotes: 0

Views: 337

Answers (1)

matt
matt

Reputation: 534977

The crash log shows that your code is happening here:

33  audition 0x00000001063f9840 -[DebutVC viewWillAppear:] + 448

You can't show an alert from viewWillAppear, because your view is not in the interface yet (it will appear, but it has not yet done so). Try moving your show code to viewDidAppear instead.

Upvotes: 3

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