ios - 什么是错误 : "NSInvalidArgumentException reason: Application tried to present modal view controller on itself

Question

当我尝试运行该应用程序时，它使我崩溃 这是我收到的消息:

2014-07-25 14:40:28.116 X[13023:60b] (null)
2014-07-25 14:40:29.113 X[13023:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modal view controller on itself. Presenting controller is <GKHostedAuthenticateViewController: 0x10d625f90>.'
*** First throw call stack:
(
    0   CoreFoundation                      0x00000001028a1495 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x00000001024e399e objc_exception_throw + 43
    2   UIKit                               0x0000000101190cdc -[UIViewController presentViewController:withTransition:completion:] + 4100
    3   CoreFoundation                      0x0000000102896f1c __invoking___ + 140
    4   CoreFoundation                      0x0000000102896dc4 -[NSInvocation invoke] + 308
    5   UIKit                               0x0000000101181abc -[_UIDelayedPresentationContext finishDelayedPresentation:] + 201
    6   GameCenterUI                        0x000000010c97f330 __41-[GKRemoteViewController setupRemoteView]_block_invoke + 37
    7   CoreFoundation                      0x0000000102896f1c __invoking___ + 140
    8   CoreFoundation                      0x0000000102896dc4 -[NSInvocation invoke] + 308
    9   libdispatch.dylib                   0x000000010340a851 _dispatch_call_block_and_release + 12
    10  libdispatch.dylib                   0x000000010341d72d _dispatch_client_callout + 8
    11  libdispatch.dylib                   0x000000010340d3fc _dispatch_main_queue_callback_4CF + 354
    12  CoreFoundation                      0x00000001028ff289 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    13  CoreFoundation                      0x000000010284c854 __CFRunLoopRun + 1764
    14  CoreFoundation                      0x000000010284bd83 CFRunLoopRunSpecific + 467
    15  GraphicsServices                    0x0000000103efdf04 GSEventRunModal + 161
    16  UIKit                               0x0000000101090e33 UIApplicationMain + 1010
    17  X                              0x00000001000064c3 main + 115
    18  libdyld.dylib                       0x000000010366e5fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

可能是什么问题？ 直到现在它运作良好突然发生了 感谢所有帮助者

更新: @Sviatoslav Yakymiv 我认为找到了这个

- (void)authenticateLocalUser {

if (!gameCenterAvailable) return;


GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
if (SYSTEM_VERSION_LESS_THAN(@"6.0"))
{
    // ios 5.x and below
    [localPlayer authenticateWithCompletionHandler:^(NSError *error)
     {
         [self checkLocalPlayer];
     }];
}
else
{
    // ios 6.0 and above
    [localPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error) {
        if (!error && viewcontroller)
        {
            [viewcontroller presentViewController:viewcontroller animated:YES completion:nil];
        }
        else
        {
            [self checkLocalPlayer];
        }
    })];
}

我可以在不崩溃的情况下改变什么？ 谢谢

Answer 1

您正试图从自身呈现 Controller 。 可能您的代码包含如下内容:

[self presentViewController:self completion:nil];

现在，在我看到您的代码后，我可以提供工作代码:

替换

[viewcontroller presentViewController:viewcontroller animated:YES completion:nil];

与

[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:viewcontroller animated:YES completion:nil];