ios – 为什么在nib中创建UIGestureRecognizer子类会导致使用UISplitViewController崩溃

概述我有兴趣在我拥有的ViewController子类中使用UIGestureRecognizer子类(UILongPressGestureRecognizer).我的ViewController有一个UIToolBar,并且我可以通过编程方式创建一个附加到UIToolBar的UILongPressGestureRecognizer实例,并且一切正常.我的ViewController采用UIGestu 我有兴趣在我拥有的VIEwController子类中使用UIGestureRecognizer子类(UILongPressGestureRecognizer).我的VIEwController有一个UIToolbar,并且我可以通过编程方式创建一个附加到UIToolbar的UILongPressGestureRecognizer实例,并且一切正常.我的VIEwController采用UIGestureRecognizerDelegate协议.在VIEwController中我有：

//My VIEwController.h@interface MyVIEwController: UIVIEwController<UIGestureRecognizerDelegate>/* ... */@property (nonatomic,retain) IBOutlet UIToolbar *toolbar;@property (nonatomic,retain) IBOutlet UILongPressGestureRecognizer *longPressGesureRecognizer;/* ... */- (IBAction)handleGesture;@end

以下代码然后工作：

- (voID)vIEwDIDLoad{    [super vIEwDIDLoad];    //configure UILongPressGestureRecognizer    if(self.longPressGesureRecognizer == nil){        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture)];        longPress.minimumPressDuration = 1.5;        longPress.numberOftouchesrequired = 1;        longPress.delegate = self;        self.longPressGesureRecognizer = longPress;        [self.toolbar addGestureRecognizer:self.longPressGesureRecognizer];        [longPress release];    }   }- (BOol)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceivetouch:(UItouch *)touch{        return YES;}- (IBAction)handleGesture{    NSLog(@"Got a gesture!");}

我认为我的VIEw Controller中不需要UILongPressGestureRecognizer.当我尝试在MyVIEwController.xib文件中完全创建它时,我使用XCode 4.2执行了以下 *** 作

>在我的UIToolbar中在xib上附加了一个UILongPressRecognizer(附加到MyVIEwController中的toolbar).
>将UILongPressRecognizer的委托属性设置为文件所有者
>将selector属性设置为MyVIEwController的handleGesture消息.

当我在模拟器中运行应用程序时,我崩溃了控制台中的以下gdb错误：

*** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[UILongPressGestureRecognizer initWithCoder:]: unrecognized selector sent to instance

很明显UILongPressGestureRecognizer initWithCoder：没有实施,但我想知道在xib文件中设置UIGestureRecognizer的正确方法是什么. XCode在那里有手势,我已将它连接到一个视图.我不明白我的错.我在UIGestureRecognizer上看到的所有链接,包括Apple的UIGestureRecognizer’s class reference,总是使用代码中的UIGestureRecognizer.我没有看到仅使用xib文件来配置它的示例.

我不太关心这个问题,因为我可以使用VIEwController中的代码处理它,但我很困惑,如果UILongPressGestureRecognizer和/或UIGestureRecognizer不符合NSCoding协议,为什么XCode允许在nib中添加手势识别器和initWithCoder将被调用.我的直觉说问题出在我的最后,而不是Apple,但我很想知道出了什么问题.

谢谢！

更新

我似乎只在使用UISplitVIEwController时在测试中看到这种行为.如果我创建一个基于VIEwController的项目,UIGestureRecognizer将按预期工作.如果我在UISplitVIEwController应用程序的DetailVIEw上添加一个手势识别器,我会发生这样的崩溃：

2011-11-03 10:17:55.873 GestureSplitVIEwTest[1143:b603] -[UILongPressGestureRecognizer initWithCoder:]: unrecognized selector sent to instance 0x59696b02011-11-03 10:17:55.877 GestureSplitVIEwTest[1143:b603] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[UILongPressGestureRecognizer initWithCoder:]: unrecognized selector sent to instance 0x59696b0'*** Call stack at first throw:(    0   CoreFoundation                      0x011b15a9 __exceptionPreprocess + 185    1   libobjc.A.dylib                     0x01305313 objc_exception_throw + 44    2   CoreFoundation                      0x011b30bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187    3   CoreFoundation                      0x01122966 ___forwarding___ + 966    4   CoreFoundation                      0x01122522 _CF_forwarding_prep_0 + 50    5   UIKit                               0x002fe9fd UINibDecoderDecodeObjectForValue + 2592    6   UIKit                               0x002fe2f5 UINibDecoderDecodeObjectForValue + 792    7   UIKit                               0x002ff6ac -[UINibDecoder decodeObjectForKey:] + 398    8   UIKit                               0x00214979 -[UIRuntimeConnection initWithCoder:] + 212    9   UIKit                               0x003d34a8 -[UIRuntimeOutletCollectionConnection initWithCoder:] + 64    10  UIKit                               0x002fe9fd UINibDecoderDecodeObjectForValue + 2592    11  UIKit                               0x002fe2f5 UINibDecoderDecodeObjectForValue + 792    12  UIKit                               0x002ff6ac -[UINibDecoder decodeObjectForKey:] + 398    13  UIKit                               0x00213c36 -[UINib instantiateWithOwner:options:] + 804    14  UIKit                               0x00215ab7 -[NSBundle(UINSBundleAdditions) loadNibnamed:owner:options:] + 168    15  UIKit                               0x000cb628 -[UIVIEwController _loadVIEwFromNibnamed:bundle:] + 70    16  UIKit                               0x000c9134 -[UIVIEwController loadVIEw] + 120    17  UIKit                               0x000c900e -[UIVIEwController vIEw] + 56    18  UIKit                               0x000c7482 -[UIVIEwController contentScrollVIEw] + 42    19  UIKit                               0x000d7f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForVIEwController:] + 48    20  UIKit                               0x000d6555 -[UINavigationController _layoutVIEwController:] + 43    21  UIKit                               0x000d7870 -[UINavigationController _startTransition:fromVIEwController:toVIEwController:] + 524    22  UIKit                               0x000d232a -[UINavigationController _startDeferredTransitionIfNeeded] + 266    23  UIKit                               0x001ed2e9 -[UILayoutContainerVIEw layoutSubvIEws] + 226    24  QuartzCore                          0x01888a5a -[CALayer layoutSublayers] + 181    25  QuartzCore                          0x0188addc CALayerLayoutIfNeeded + 220    26  QuartzCore                          0x018300b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310    27  QuartzCore                          0x01831294 _ZN2CA11Transaction6commitEv + 292    28  UIKit                               0x0001b9c9 -[UIApplication _reportAppLaunchFinished] + 39    29  UIKit                               0x0001be83 -[UIApplication _runWithURL:payload:launchOrIEntation:statusbarStyle:statusbarHIDden:] + 690    30  UIKit                               0x00026617 -[UIApplication handleEvent:withNewEvent:] + 1533    31  UIKit                               0x0001eabf -[UIApplication sendEvent:] + 71    32  UIKit                               0x00023f2e _UIApplicationHandleEvent + 7576    33  GraphiCSServices                    0x00eb2992 PurpleEventCallback + 1550    34  CoreFoundation                      0x01192944 __CFRUNLOOP_IS_CALliNG_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52    35  CoreFoundation                      0x010f2cf7 __CFRunLoopDoSource1 + 215    36  CoreFoundation                      0x010eff83 __CFRunLoopRun + 979    37  CoreFoundation                      0x010ef840 CFRunLoopRunspecific + 208    38  CoreFoundation                      0x010ef761 CFRunLoopRunInMode + 97    39  UIKit                               0x0001b7d2 -[UIApplication _run] + 623    40  UIKit                               0x00027c93 UIApplicationMain + 1160    41  GestureSplitVIEwTest                0x0000234a main + 170    42  GestureSplitVIEwTest                0x00002295 start + 53)terminate called throwing an exceptionsharedlibrary apply-load-rules allCurrent language:  auto; currently objective-c(gdb)

解决方法 您确定没有使用iOS 4.3 SDK而不是iOS 5 SDK吗？

我花了30分钟才发现我使用的是错误的SDK.

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