Question

我尝试了How do I prompt the user for push notification permission after a button is pushed?但它没有用。

由于How do I prompt the user for push notification permission after a button is pushed?的代码不起作用，我删除了它。该应用程序应该恢复正常，对吧？

相反，我甚至不能再运行它了。单击Simulator中的按钮后，Xcode显示此错误：

    2017-04-30 21:02:21.528 GradientAlarm[63166:7174122] 
    [GradientAlarm.ViewController allowNotifAction:]: unrecognized selector 
    sent to instance 0x7a0420b0
    2017-04-30 21:02:21.535 GradientAlarm[63166:7174122] *** Terminating app 
    due to uncaught exception 'NSInvalidArgumentException', reason: '-
    [GradientAlarm.ViewController allowNotifAction:]: unrecognized selector 
    sent to instance 0x7a0420b0'
    *** First throw call stack:
    (
    0   CoreFoundation                      0x030b3ded __exceptionPreprocess + 
    189
    1   libobjc.A.dylib                     0x0065cd6f objc_exception_throw + 
    49
    2   CoreFoundation                      0x031255b8 -[NSObject(NSObject) 
    doesNotRecognizeSelector:] + 136
    3   CoreFoundation                      0x03039a8d ___forwarding___ + 941
    4   CoreFoundation                      0x030396be _CF_forwarding_prep_0 + 
    14
    5   libobjc.A.dylib                     0x00672220 -[NSObject 
    performSelector:withObject:withObject:] + 63
    6   UIKit                               0x00ad3d90 -[UIApplication 
    sendAction:to:from:forEvent:] + 91
    7   UIKit                               0x00ad3d2a -[UIApplication 
    sendAction:toTarget:fromSender:forEvent:] + 41
    8   UIKit                               0x00c7bd0b -[UIControl 
    sendAction:to:forEvent:] + 64
    9   UIKit                               0x00c7c075 -[UIControl 
    _sendActionsForEvents:withEvent:] + 469
    10  UIKit                               0x00c7afab -[UIControl 
    touchesEnded:withEvent:] + 666
    11  UIKit                               0x00b4a2ca -[UIWindow 
    _sendTouchesForEvent:] + 3066
    12  UIKit                               0x00b4bb8e -[UIWindow sendEvent:] 
    + 4445
    13  UIKit                               0x00af1fe0 -[UIApplication 
    sendEvent:] + 363
    14  UIKit                               0x0136e16f 
    __dispatchPreprocessedEventFromEventQueue + 2973
    15  UIKit                               0x0136563f __handleEventQueue + 
    1255
    16  UIKit                               0x01366ba3 
    __handleHIDEventFetcherDrain + 66
    17  CoreFoundation                      0x03058a5f 
    __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
   18  CoreFoundation                      0x0303e1c4 __CFRunLoopDoSources0 + 
   500
   19  CoreFoundation                      0x0303d69c __CFRunLoopRun + 1084
   20  CoreFoundation                      0x0303cfd4 CFRunLoopRunSpecific + 
   372
   21  CoreFoundation                      0x0303ce4b CFRunLoopRunInMode + 123
   22  GraphicsServices                    0x04d58a7a GSEventRunModal + 71
   23  GraphicsServices                    0x04d5895f GSEventRun + 80
   24  UIKit                               0x00ad1cb9 UIApplicationMain + 148
25  GradientAlarm                       0x0008cbab main + 75
26  libdyld.dylib                       0x03f16779 start + 1)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

我不知道为什么会这样。我删除了我添加的信息，并打开了一个新项目，我从中复制并粘贴了所有默认值，但我仍然有相同的错误信息。

Answer 1

您可能仍然在.xib或storyboard视图控制器中引用allowNotifAction:。

转到界面构建器（.xib或storyboard），选择视图控制器并确保没有对该方法的引用。

Answer 2

这个问题的答案很简单。控制台的错误消息不是很有帮助，但我环顾四周并意识到我已经将相同的按钮链接到View Controller两次，即使我在View Controller中删除了相应的编程块，该按钮仍然链接到一些东西。我只需右键单击故事板中的按钮并删除它。

愚蠢的错误。谢谢大家回复！

单击模拟器中的按钮会导致应用程序崩溃

2 个答案: