Question

我正在制作兼容iOS7的iPad应用程序。应用程序在iOS 6中运行完美，但它在iOS 7中崩溃。

if ([self.exercise.variant isEqualToString:kVariantGFTextItem]) {

            NSLog(@"item:%@",[[[itemArray objectAtIndex:0] superview]superview]);

            GapsFillItem *itemView = (GapsFillItem*)[[[[itemArray objectAtIndex:0] superview]superview]subviews];
            if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
            {
                itemView = (GapsFillItem*)[[[itemArray objectAtIndex:0] superview]superview];
            }

            [itemView.buttonPlaySound setImage:(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)?kImageButtonSoundPerItemPad:kImageButtonSoundPerItemPhone forState:UIControlStateNormal];
            itemView.buttonPlaySound.userInteractionEnabled = YES;
        }

此代码在iOS 6中完美运行，但在iOS 7中运行不正确。

以下是崩溃日志：

    2013-10-19 09:41:53.208 Elementary[645:a0b] item:<TextViewWithTextField: 0xa9e3800; baseClass = UITextView; frame = (183 -10; 562 92); text = 'Hello. Can I  +change+   ...'; clipsToBounds = YES; gestureRecognizers = <NSArray: 0xa7a8170>; layer = <CALayer: 0xa7a7ef0>; contentOffset: {0, 0}>
2013-10-19 09:41:53.209 Elementary[645:a0b] -[__NSArrayM buttonPlaySound]: unrecognized selector sent to instance 0xa7ac9a0
2013-10-19 09:41:53.212 Elementary[645:a0b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM buttonPlaySound]: unrecognized selector sent to instance 0xa7ac9a0'
*** First throw call stack:
(
    0   CoreFoundation                      0x02a435e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x027178b6 objc_exception_throw + 44
    2   CoreFoundation                      0x02ae0903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
    3   CoreFoundation                      0x02a3390b ___forwarding___ + 1019
    4   CoreFoundation                      0x02a334ee _CF_forwarding_prep_0 + 14
    5   Elementary                          0x00066185 -[GapsFill checkAnswers] + 4693
    6   Elementary                          0x00011bd4 -[ParentViewController checkToolMenuItemTapped] + 228
    7   Elementary                          0x0002da45 -[ToolsMenu menuItemTapped:] + 565
    8   libobjc.A.dylib                     0x02729874 -[NSObject performSelector:withObject:withObject:] + 77
    9   UIKit                               0x00f1dc8c -[UIApplication sendAction:to:from:forEvent:] + 108
    10  UIKit                               0x00f1dc18 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
    11  UIKit                               0x010156d9 -[UIControl sendAction:to:forEvent:] + 66
    12  UIKit                               0x01015a9c -[UIControl _sendActionsForEvents:withEvent:] + 577
    13  UIKit                               0x01014d4b -[UIControl touchesEnded:withEvent:] + 641
    14  UIKit                               0x00f5b0cd -[UIWindow _sendTouchesForEvent:] + 852
    15  UIKit                               0x00f5bd34 -[UIWindow sendEvent:] + 1232
    16  UIKit                               0x00f2fa36 -[UIApplication sendEvent:] + 242
    17  UIKit                               0x00f19d9f _UIApplicationHandleEventQueue + 11421
    18  CoreFoundation                      0x029cc8af __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    19  CoreFoundation                      0x029cc23b __CFRunLoopDoSources0 + 235
    20  CoreFoundation                      0x029e930e __CFRunLoopRun + 910
    21  CoreFoundation                      0x029e8b33 CFRunLoopRunSpecific + 467
    22  CoreFoundation                      0x029e894b CFRunLoopRunInMode + 123
    23  GraphicsServices                    0x035b79d7 GSEventRunModal + 192
    24  GraphicsServices                    0x035b77fe GSEventRun + 104
    25  UIKit                               0x00f1c94b UIApplicationMain + 1225
    26  Elementary                          0x00002285 main + 181
    27  Elementary                          0x000021c5 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException

如果有人知道为什么会这样。请告诉我。

Answer 1

您的itemView看起来像是GapsFillItem类型，实际上是NSArray类型。

您知道这一点，因为崩溃报告告诉您NSArray无法识别名为buttonPlaySound的选择器，我认为该选择器是在GapsFillItem类上定义的。

我建议在其中添加一些NSLog语句，以了解itemView如何成为NSArray。

一般来说，这样的行非常可疑：

GapsFillItem *itemView = (GapsFillItem*)[[[[itemArray objectAtIndex:0] superview]superview]subviews];

itemView = (GapsFillItem*)[[[itemArray objectAtIndex:0] superview]superview];

这两行中的一行是问题所在。我建议通过超级浏览调查超级视图以避免访问对象等等。如果你需要通过这种链接到某些东西，那么最有可能是更好的方式。

祝你好运

修改

乍一看，由于这条线路，它看起来总会在iPad上崩溃：

GapsFillItem *itemView = (GapsFillItem*)[[[[itemArray objectAtIndex:0] superview]superview]subviews];

子视图是一个数组。这是你的问题。您可能需要将itemView设置为子视图中的项目。

也就是说，崩溃可能只是设备特定的，与iOS 7无关。

无法识别的选择器发送到实例0xa7ac9a0

1 个答案: