Ios 使用NSUserdefaults注销用户时会出现什么错误？
我不明白为什么会出现此错误： 注销时，我称之为：Ios 使用NSUserdefaults注销用户时会出现什么错误？,ios,objective-c,Ios,Objective C,我不明白为什么会出现此错误： 注销时，我称之为： -(void)logoutUser { NSLog(@"Logging out user"); NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier]; [[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain]; } 在加载HomeCollection
-(void)logoutUser {
NSLog(@"Logging out user");
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
}
-(void)viewDidAppear:(BOOL)animated {
// Get the stored data before the view loads
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//if values exist then already logged in else take to login screen
if([[[defaults dictionaryRepresentation] allKeys] containsObject:@"userId"]){
NSLog(@"userId found");
} else {
NSLog(@"userId NOT found");
StarterViewController *hc=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"Starter"];
[self presentViewController:hc animated:YES completion:nil];
}
}
2014-04-28 10:19:38.431 App[2675:60b] Warning: Attempt to present <HomeCollectionViewController: 0xba9dd10> on <SlidingMenuViewController: 0xba94200> whose view is not in the window hierarchy!
2014-04-28 10:19:38.443 App[2675:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSJSONSerialization dataWithJSONObject:options:error:]: value parameter is nil'
*** First throw call stack:
(
0 CoreFoundation 0x01dff1e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01b7e8e5 objc_exception_throw + 44
2 CoreFoundation 0x01dfefbb +[NSException raise:format:] + 139
3 Foundation 0x018c4a42 +[NSJSONSerialization dataWithJSONObject:options:error:] + 92
4 Stand 0x00008769 -[HomeCollectionViewController getHomeData] + 297
5 Stand 0x000084a8 -[HomeCollectionViewController viewDidLoad] + 744
6 UIKit 0x0095d33d -[UIViewController loadViewIfRequired] + 696
7 UIKit 0x0095d5d9 -[UIViewController view] + 35
8 UIKit 0x00988509 -[UINavigationController rotatingSnapshotViewForWindow:] + 52
9 UIKit 0x00ccfe3c -[UIClientRotationContext initWithClient:toOrientation:duration:andWindow:] + 420
10 UIKit 0x00884c22 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 1495
11 UIKit 0x00884646 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
12 UIKit 0x00884518 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
13 UIKit 0x008845a0 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
14 UIKit 0x0088363a __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
15 UIKit 0x0088359c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
16 UIKit 0x008842f3 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
17 UIKit 0x008878e6 -[UIWindow setDelegate:] + 449
18 UIKit 0x00961b77 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
19 UIKit 0x0087d474 -[UIWindow addRootViewControllerViewIfPossible] + 591
20 UIKit 0x0087d5ef -[UIWindow _setHidden:forced:] + 312
21 UIKit 0x0087d86b -[UIWindow _orderFrontWithoutMakingKey] + 49
22 UIKit 0x008883c8 -[UIWindow makeKeyAndVisible] + 65
23 UIKit 0x00838bc0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 2097
24 UIKit 0x0083d667 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
25 UIKit 0x00851f92 -[UIApplication handleEvent:withNewEvent:] + 3517
26 UIKit 0x00852555 -[UIApplication sendEvent:] + 85
27 UIKit 0x0083f250 _UIApplicationHandleEvent + 683
28 GraphicsServices 0x03bbff02 _PurpleEventCallback + 776
29 GraphicsServices 0x03bbfa0d PurpleEventCallback + 46
30 CoreFoundation 0x01d7aca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
31 CoreFoundation 0x01d7a9db __CFRunLoopDoSource1 + 523
32 CoreFoundation 0x01da568c __CFRunLoopRun + 2156
33 CoreFoundation 0x01da49d3 CFRunLoopRunSpecific + 467
34 CoreFoundation 0x01da47eb CFRunLoopRunInMode + 123
35 UIKit 0x0083cd9c -[UIApplication _run] + 840
36 UIKit 0x0083ef9b UIApplicationMain + 1225
37 Stand 0x0000948d main + 141
38 libdyld.dylib 0x0254b701 start + 1
39 ??? 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
2014-04-28 10:19:38.431应用程序[2675:60b]警告：试图在不在窗口层次结构中的视图上显示！
2014-04-28 10:19:38.443应用程序[2675:60b]***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“***+[NSJSONSerialization dataWithJSONObject:选项：错误：]：值参数为零”
***第一次抛出调用堆栈：
(
0 CoreFoundation 0x01dff1e4例外预处理+180
1 libobjc.A.dylib 0x01b7e8e5 objc_异常_抛出+44
2 CoreFoundation 0x01dfefbb+[N异常提升：格式：][139
3基金会0x018C4A42+[ NSJSONSONTRORATION DATAWORJSONObj:选项：错误：] + 92
4个支架0x00008769-[HomeCollectionViewController getHomeData]+297
5个支架0x000084a8-[HomeCollectionViewController viewDidLoad]+744
6 UIKit 0x0095d33d-[UIViewController loadViewIfRequired]+696
7 UIKit 0x0095d5d9-[UIViewController视图]+35
8 UIKit 0x00988509-[UINavigationController旋转快照视图用于窗口：+52
9 UIKit 0x00ccfe3c-[UIClientRotationContext initWithClient:TooOrientation:duration:andWindow:+420
10 UIKit 0x00884c22-[UIWindow\u setRotatableClient:TooOrientation:updateStatusBar:duration:force:isRotating:+1495
11 UIKit 0x00884646-[UIWindow\u setRotatableClient:TooOrientation:updateStatusBar:duration:force:+82
12 UIKit 0x00884518-[UIWindow\u setRotatableViewOrientation:updateStatusBar:duration:force:+117
13 UIKit 0x008845a0-[UIWindow\u setRotatableViewOrientation:持续时间：强制：+67
14 UIKit 0x0088363a uu 57-[UIWindow updateToInterfaceOrientation:duration:force:][uBlock_invoke+120
15 UIKit 0x0088359c-[UIWindow\u updateToInterfaceOrientation:duration:force:+400
16 UIKit 0x008842f3-[UIWindow setAutorotates:forceUpdateInterfaceOrientation:+870
17 UIKit 0x008878e6-[UIWindow setDelegate:+449
18 UIKit 0x00961b77-[UIViewController\u TryBecomerootViewController窗口:+180
19 UIKit 0x0087d474-[UIWindow AddRootViewControllerServiceWifPossible]+591
20 UIKit 0x0087d5ef-[UIWindow\u setHidden:强制：][312
21 UIKit 0x0087d86b-[UIWindow\u OrderFront不带制作键]+49
22 UIKit 0x008883c8-[UIWindow makeKeyAndVisible]+65
23 UIKit 0x00838bc0-[UIApplication\u CallInitializationDelegatesForRL:有效负载：挂起：][2097
24 UIKit 0x0083d667-[UIApplication\u运行时URL:payload:launchOrientation:statusBarStyle:statusBarHidden:+824
25 UIKit 0x00851f92-[UIApplication handleEvent:withNewEvent:][3517
26 UIKit 0x00852555-[UIApplication sendEvent:+85
27 UIKit 0x0083f250 _UIApplicationHandleEvent+683
28图形服务0x03bbff02 _PurpleEventCallback+776
29图形服务0x03bbfa0d PurpleEventCallback+46
30 CoreFoundation 0x01d7aca5\uuuu CFRUNLOOP\u正在调用\uu OUT\uu以执行\uu功能\uuuu+53
31 CoreFoundation 0x01d7a9db\uu CFRunLoopDoSource1+523
32 CoreFoundation 0x01da568c__CFRunLoopRun+2156
33 CoreFoundation 0x01da49d3 CFRunLoopRunSpecific+467
34 CoreFoundation 0x01da47eb CFRUNLOOPSRUNINMODE+123
35 UIKit 0x0083cd9c-[UIU应用程序运行]+840
36 UIKit 0x0083ef9b UIApplicationMain+1225
37支架0x0000948d干管+141
38 libdyld.dylib 0x0254b701开始+1
39°？0x00000001 0x0+1
)
libc++abi.dylib:以NSException类型的未捕获异常终止
HomeCollectionViewControllerviewDidLoadgetHomeDatagetHomeData您需要研究此方法并找出JSON的问题所在。我不确定您显示的代码是否与stacktrace.bz相关，您得到的值为nil问题是，如果方法ViewDidDisplay出现，则根本不应调用HomeCollectionViewController（该方法在包装它的导航控制器中被调用）结果是什么？或者我需要补充什么吗？我认为你对你的问题得出了错误的结论。正在调用HomeCollectionViewController-从堆栈跟踪可以看出这一点。此视图控制器正在其
viewDidLoadgetHomeDatagetHomeData