UIWebView抛出NSUnknownKeyException iPad

我有一个标签栏应用程序。一切正常，我可以切换标签罚款和一切，除了当我切换到我的第二个标签ProductViewClass视图不更新，它吐出了下面的控制台输出。除了UIWebView和UILabel之外，我在这个视图中没有任何东西。当我删除UIWebView它运行成功，当我添加另一个它仍然工作。当我将文件所有者的IBOutlet连接到UIWebView时，它只会停止工作。除了合成和释放productWebView在ProductWebView.m唯一的非模板代码是这样的：UIWebView抛出NSUnknownKeyException iPad

NSString *urlString = @"http://www.google.com/"; 
    NSURL *theURL = [NSURL URLWithString:urlString]; 
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:theURL]; 
    [productWebView loadRequest:urlRequest]; 
    NSLog(@"Google loaded");

ProductWebView.h的全文如下：

#import <UIKit/UIKit.h> 
@interface ProductViewClass : UIViewController { 

    IBOutlet UIWebView *productWebView; 
} 

@property(nonatomic, retain) UIWebView *productWebView; 
@end

这里是控制台输出：

This GDB was configured as "x86_64-apple-darwin".Attaching to process 52523. 
2011-01-30 19:18:28.907 FairCom[52523:40b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x4d06eb0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key productWebView.' 
*** Call stack at first throw: 
(
    0 CoreFoundation      0x00da8be9 __exceptionPreprocess + 185 
    1 libobjc.A.dylib      0x00efd5c2 objc_exception_throw + 47 
    2 CoreFoundation      0x00da8b21 -[NSException raise] + 17 
    3 Foundation       0x000296cf _NSSetUsingKeyValueSetter + 135 
    4 Foundation       0x0002963d -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285 
    5 UIKit        0x004a88d6 -[UIRuntimeOutletConnection connect] + 112 
    6 CoreFoundation      0x00d1f2cf -[NSArray makeObjectsPerformSelector:] + 239 
    7 UIKit        0x004a72ed -[UINib instantiateWithOwner:options:] + 1041 
    8 UIKit        0x004a9081 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168 
    9 UIKit        0x00361a94 -[UIViewController _loadViewFromNibNamed:bundle:] + 70 
    10 UIKit        0x0035f709 -[UIViewController loadView] + 120 
    11 UIKit        0x0035f5e3 -[UIViewController view] + 56 
    12 UIKit        0x00372230 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 120 
    13 UIKit        0x00370d86 -[UITabBarController transitionFromViewController:toViewController:] + 64 
    14 UIKit        0x00372b7e -[UITabBarController _setSelectedViewController:] + 263 
    15 UIKit        0x003729ed -[UITabBarController _tabBarItemClicked:] + 352 
    16 UIKit        0x002b1a6e -[UIApplication sendAction:to:from:forEvent:] + 119 
    17 UIKit        0x004af1f2 -[UITabBar _sendAction:withEvent:] + 422 
    18 UIKit        0x002b1a6e -[UIApplication sendAction:to:from:forEvent:] + 119 
    19 UIKit        0x003401b5 -[UIControl sendAction:to:forEvent:] + 67 
    20 UIKit        0x00342647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
    21 UIKit        0x0034016c -[UIControl sendActionsForControlEvents:] + 49 
    22 UIKit        0x002b1a6e -[UIApplication sendAction:to:from:forEvent:] + 119 
    23 UIKit        0x003401b5 -[UIControl sendAction:to:forEvent:] + 67 
    24 UIKit        0x00342647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
    25 UIKit        0x003411f4 -[UIControl touchesEnded:withEvent:] + 458 
    26 UIKit        0x002d60d1 -[UIWindow _sendTouchesForEvent:] + 567 
    27 UIKit        0x002b737a -[UIApplication sendEvent:] + 447 
    28 UIKit        0x002bc732 _UIApplicationHandleEvent + 7576 
    29 GraphicsServices     0x016dea36 PurpleEventCallback + 1550 
    30 CoreFoundation      0x00d8a064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 
    31 CoreFoundation      0x00cea6f7 __CFRunLoopDoSource1 + 215 
    32 CoreFoundation      0x00ce7983 __CFRunLoopRun + 979 
    33 CoreFoundation      0x00ce7240 CFRunLoopRunSpecific + 208 
    34 CoreFoundation      0x00ce7161 CFRunLoopRunInMode + 97 
    35 GraphicsServices     0x016dd268 GSEventRunModal + 217 
    36 GraphicsServices     0x016dd32d GSEventRun + 115 
    37 UIKit        0x002c042e UIApplicationMain + 1160 
    38 FairCom        0x00001be0 main + 102 
    39 FairCom        0x00001b71 start + 53 
    40 ???         0x00000001 0x0 + 1 
) 
terminate called after throwing an instance of 'NSException' 
sharedlibrary apply-load-rules all 
(gdb)

感谢您的帮助！

来源

2011-01-31 SeniorShizzle

可能重复的[此类不是密钥的关键值编码兼容]（http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for -the-key） – jtbandes 2015-08-01 21:59:38

您正在加载一个笔尖。在那个笔尖上，你有一个名为productWebView的插座，可能是网络视图。你看到的例外是告诉你，productWebView插座实际上并不存在。这是它变得奇怪的地方。错误说对象<UIViewController 0x4d06eb0>是有这个缺少的出口的那个。奇怪的位是UIViewController而不是实际视图控制器子类的名称。这听起来像你有一个笔尖，其中文件的所有者被设置为您的视图控制器子类之一，但在运行时，您实际上只是直接使用UIViewController的实例。您应该验证代表选项卡栏控制器中代表选项卡的所有视图控制器都是UIViewController的实际正确子类，而不仅仅是UIViewController本身的实例。

来源

2011-01-31 05:09:01

谢谢！我回去看看我的UITabBarItems，他们没有设置任何特定的笔尖/类，所以这是一个奇迹，他们为什么工作！ – SeniorShizzle 2011-02-20 07:43:35

UIWebView抛出NSUnknownKeyException iPad

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