iOS/Facebook 登录错误：此类与键的键值编码不兼容

Posted 2023-02-27

【中文标题】iOS/Facebook 登录错误：此类与键的键值编码不兼容

【英文标题】：iOS/Facebook Login error: this class is not key value coding-compliant for the key

【发布时间】：2013-12-10 08:46:04

【问题描述】：

我只是想为我的 ios 应用程序构建一个 Facebook 登录页面，但是当我的 LoginViewController 中的 IBOutlet 尝试连接到 UIActivityIndi​​catorView 时，它会一直中断。这是我得到的错误：

2013-12-10 00:29:11.062 uConnect[2254:70b] * 由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[setValue:forUndefinedKey:]：这个类是不符合键加载器的键值编码。'

这是我的界面

@interface UConnectLoginViewController : UIViewController
-(void)loginFailed;
@property (strong, nonatomic) IBOutlet UIActivityIndicatorView* loader;
@end

这是我的实现

@interface UConnectLoginViewController ()
-(IBAction)performLogin:(id)sender;


@end

@implementation UConnectLoginViewController
@synthesize loader;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) 
        // Custom initialization
    
    return self;


- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.


- (void)didReceiveMemoryWarning

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.


-(IBAction)performLogin:(id)sender

    [self.loader startAnimating];
    UConnectAppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
    [appDelegate openSession];


-(void)loginFailed

    [self.loader stopAnimating];

@end

在 xib 文件中，我已经将 Outlet 连接到视图。

编辑：

Here is the full console error log:
2013-12-10 18:02:13.830 uConnect[3596:70b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UConnectLoginViewController 0x8a8c4a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key spinner.'
*** First throw call stack:
(
    0   CoreFoundation                      0x017b85e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0153b8b6 objc_exception_throw + 44
    2   CoreFoundation                      0x018486a1 -[NSException raise] + 17
    3   Foundation                          0x011fc9ee -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
    4   Foundation                          0x01168cfb _NSSetUsingKeyValueSetter + 88
    5   Foundation                          0x01168253 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
    6   Foundation                          0x011ca70a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
    7   UIKit                               0x0054ba15 -[UIRuntimeOutletConnection connect] + 106
    8   libobjc.A.dylib                     0x0154d7d2 -[NSObject performSelector:] + 62
    9   CoreFoundation                      0x017b3b6a -[NSArray makeObjectsPerformSelector:] + 314
    10  UIKit                               0x0054a56e -[UINib instantiateWithOwner:options:] + 1417
    11  UIKit                               0x003bc605 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
    12  UIKit                               0x003bcdad -[UIViewController loadView] + 302
    13  UIKit                               0x003bd0ae -[UIViewController loadViewIfRequired] + 78
    14  UIKit                               0x003bd5b4 -[UIViewController view] + 35
    15  UIKit                               0x003ccab9 -[UIViewController shouldAutorotate] + 36
    16  UIKit                               0x003cce01 -[UIViewController _preferredInterfaceOrientationForPresentationInWindow:fromInterfaceOrientation:] + 297
    17  UIKit                               0x006515e5 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:animation:] + 2330
    18  UIKit                               0x003c90fc -[UIViewController presentViewController:withTransition:completion:] + 6433
    19  UIKit                               0x003c961f -[UIViewController presentViewController:animated:completion:] + 130
    20  uConnect                            0x00002c7a -[UConnectAppDelegate showLoginView] + 218
    21  uConnect                            0x000029b7 -[UConnectAppDelegate application:didFinishLaunchingWithOptions:] + 647
    22  UIKit                               0x002a3355 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 309
    23  UIKit                               0x002a3b95 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1536
    24  UIKit                               0x002a83a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
    25  UIKit                               0x002bc87c -[UIApplication handleEvent:withNewEvent:] + 3447
    26  UIKit                               0x002bcde9 -[UIApplication sendEvent:] + 85
    27  UIKit                               0x002aa025 _UIApplicationHandleEvent + 736
    28  GraphicsServices                    0x0375f2f6 _PurpleEventCallback + 776
    29  GraphicsServices                    0x0375ee01 PurpleEventCallback + 46
    30  CoreFoundation                      0x01733d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
    31  CoreFoundation                      0x01733a9b __CFRunLoopDoSource1 + 523
    32  CoreFoundation                      0x0175e77c __CFRunLoopRun + 2156
    33  CoreFoundation                      0x0175dac3 CFRunLoopRunSpecific + 467
    34  CoreFoundation                      0x0175d8db CFRunLoopRunInMode + 123
    35  UIKit                               0x002a7add -[UIApplication _run] + 840
    36  UIKit                               0x002a9d3b UIApplicationMain + 1225
    37  uConnect                            0x000026fd main + 141
    38  libdyld.dylib                       0x01df670d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

输出中提到的应用委托代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

    // Override point for customization after application launch. WE CHECK IF THEY ARE ALREADY LOGGED IN OR NOT.
    self.mainViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"UconnectViewController"];
    self.navigationController = [[UINavigationController alloc]
                                 initWithRootViewController:self.mainViewController];
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];
    if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded) 
        // Open the session
        [self openSession];
     else 
        //Display login view
        [self showLoginView];
    
    return YES;

这是另一个函数。

-(void)showLoginView

    UIViewController *topViewController = [self.navigationController topViewController];
    UIViewController *presentedViewController = [topViewController presentedViewController];

    //-If login screen is not displayed display it.
    //-If the login screen is displayed and we come back here then login failure.
    //-Update UI if the second happens
    if (![presentedViewController isKindOfClass:[UConnectLoginViewController class]]) 
        UConnectLoginViewController* login = [[UConnectLoginViewController alloc] initWithNibName:@"UConnectLoginViewController" bundle:nil];
        [topViewController presentViewController:login animated:NO completion:nil];
     else 
        UConnectLoginViewController* login = (UConnectLoginViewController*) presentedViewController;
        [login loginFailed];
    

【问题讨论】：

到底发生在哪里？在哪一行？

它只是在我启动时崩溃，所以应用程序的第一行 didfinishlaunchingwithoptions。

为什么要同时使用storyboard和xib？ UConnectLoginViewController.xib 是否存在？请使用断点找出崩溃的位置。

【参考方案1】：

好的，也许问题是您忘记在 Info.plist 中输入“URL 类型”

打开您的 Info.plist 添加 URL 类型键（从下拉列表中获取） 这将添加一个包含 1 个字典类型项的数组 从字典的下拉列表中选择“URL Schemes”数组 这将添加“URL Schemes”数组 在“URL Schemes”数组中添加一个包含“fbYourFBAppId”的字符串

希望对你有所帮助4