iOS 此类对于键标签不符合键值编码

Question

所以我是 iOS 编程的新手，我遇到了一个问题。

我创建了一个新的 View Controller ，并单击复选标记为其自动创建一个 .xib 文件。在 xib 文件中，我放了一个标签，我想淡入。所以我尝试将它链接到我的自定义 View Controller ，并继续崩溃并显示“此类不符合键 login1 的键值编码”。 Login1 是我导入的 UILabel 的名称。这是 RootView 的头文件:

@interface RootViewController : UIViewController {
    PlayerStatViewController *playerStatViewController;
    NSString *viewName;
}
@property (weak, nonatomic) IBOutlet UILabel *login1;
@property (nonatomic, retain) PlayerStatViewController *playerStatViewController;
@property (nonatomic, retain) NSString *viewName;

-(IBAction)switchPage:(id)sender:(NSString *)toSwitch;
-(void) animateButton;
@end

和 .m 文件: #import "RootViewController.h" #import "FileUtils.h"

@interface RootViewController ()

@end

@implementation RootViewController

@synthesize playerStatViewController;
@synthesize viewName;
@synthesize login1;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    self.viewName = @"Boot";
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSString* fpath = [NSString stringWithFormat:@"%@%@", getDefPath(), @"/config.txt"];
    self.login1.text = loadfile(@"serverName", fpath);
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

-(IBAction)switchPage:(id)sender :(NSString *)toSwitch {
    if([toSwitch isEqualToString:(@"PlayerStat")]) {
        if(self.playerStatViewController == nil) {
        PlayerStatViewController *playerStatView = [[PlayerStatViewController alloc]
                                                    initWithNibName:(@"PlayerStat") bundle:[NSBundle mainBundle]];
            self.playerStatViewController = playerStatView;
        }
    [self.navigationController pushViewController:self.playerStatViewController animated:YES];
    }else if([toSwitch isEqualToString:(@"Boot")]) {
        [self.navigationController pushViewController:self animated:YES];
    }
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self performSelector:@selector(animateButton) withObject:nil afterDelay:0.1f];
}

- (void)animateButton {
    self.login1.alpha = 0;

    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseIn
                     animations:^{ self.login1.alpha = 1;}
                      completion:nil];
}

@end

我如何加载 Xib(如果重要的话):

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        RootViewController *viewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
        [self.window setRootViewController:viewController];
        [window makeKeyAndVisible];
        return YES;
    }

专为 iPhone 构建的项目。在 Xib 中，是的，自定义 View Controller 被设置为文件所有者。没有错误的值(检查管理器中的感叹号)。

编辑:崩溃日志:

    2014-08-06 06:02:12.887 TrinityApi[5761:60b] *** Terminating app due to uncaught exception     'NSUnknownKeyException', reason: '[<UIApplication 0x8c781d0> setValue:forUndefinedKey:]: this     class is not key value coding-compliant for the key login1.'
*** First throw call stack:
(
    0   CoreFoundation                      0x017ee1e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0156d8e5 objc_exception_throw + 44
    2   CoreFoundation                      0x0187dfe1 -[NSException raise] + 17
    3   Foundation                          0x0122dd9e -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
    4   Foundation                          0x0119a1d7 _NSSetUsingKeyValueSetter + 88
    5   Foundation                          0x01199731 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
    6   Foundation                          0x011fbb0a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
    7   UIKit                               0x004e41f4 -[UIRuntimeOutletConnection connect] + 106
    8   libobjc.A.dylib                     0x0157f7de -[NSObject performSelector:] + 62
    9   CoreFoundation                      0x017e976a -[NSArray makeObjectsPerformSelector:] + 314
    10  UIKit                               0x004e2d4d -[UINib instantiateWithOwner:options:] + 1417
    11  UIKit                               0x004e4ada -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 165
    12  UIKit                               0x0022d61b -[UIApplication _loadMainNibFileNamed:bundle:] + 58
    13  UIKit                               0x0022d949 -[UIApplication _loadMainInterfaceFile] + 245
    14  UIKit                               0x0022c54e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 543
    15  UIKit                               0x00240f92 -[UIApplication handleEvent:withNewEvent:] + 3517
    16  UIKit                               0x00241555 -[UIApplication sendEvent:] + 85
    17  UIKit                               0x0022e250 _UIApplicationHandleEvent + 683
    18  GraphicsServices                    0x037e3f02 _PurpleEventCallback + 776
    19  GraphicsServices                    0x037e3a0d PurpleEventCallback + 46
    20  CoreFoundation                      0x01769ca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
    21  CoreFoundation                      0x017699db __CFRunLoopDoSource1 + 523
    22  CoreFoundation                      0x0179468c __CFRunLoopRun + 2156
    23  CoreFoundation                      0x017939d3 CFRunLoopRunSpecific + 467
    24  CoreFoundation                      0x017937eb CFRunLoopRunInMode + 123
    25  UIKit                               0x0022bd9c -[UIApplication _run] + 840
    26  UIKit                               0x0022df9b UIApplicationMain + 1225
    27  TrinityApi                          0x00002a9d main + 141
    28  libdyld.dylib                       0x01e35701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

编辑:只是随机开始工作

Answer 1

“class is not key value coding-compliant” 表示您一开始为我们的标签分配了一个 socket ，并在我们的 xib 中连接了它，但后来您删除了 socket ，xib 是仍然包含对不再存在的 socket 的引用，您需要从 xib 中删除此引用。

转到您的 XIB 文件并右键单击 Files Owner，您可能会发现上面有一个黄色标记的标签，只需移除其连接的 socket ，清理并再次运行您的程序