ios - 类 AppDelegate : UIResponder, UIApplicationDelegate { SWIFT 中的 SIGABIRT 错误

Question

我收到这个错误，我不知道为什么？今天开始学swift了

2016-06-28 02:40:03.393 Calculator[7072:173608] -[Calculator.ViewController touchDigit]: unrecognized selector sent to instance 0x7fc4a9465000
2016-06-28 02:40:03.400 Calculator[7072:173608] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Calculator.ViewController touchDigit]: unrecognized selector sent to instance 0x7fc4a9465000'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000100c40e65 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000102980deb objc_exception_throw + 48
    2   CoreFoundation                      0x0000000100c4948d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
    3   CoreFoundation                      0x0000000100b9690a ___forwarding___ + 970
    4   CoreFoundation                      0x0000000100b964b8 _CF_forwarding_prep_0 + 120
    5   UIKit                               0x000000010145f194 -[UIApplication sendAction:to:from:forEvent:] + 92
    6   UIKit                               0x00000001015ce6fc -[UIControl sendAction:to:forEvent:] + 67
    7   UIKit                               0x00000001015ce9c8 -[UIControl _sendActionsForEvents:withEvent:] + 311
    8   UIKit                               0x00000001015cdaf8 -[UIControl touchesEnded:withEvent:] + 601
    9   UIKit                               0x00000001014ce49b -[UIWindow _sendTouchesForEvent:] + 835
    10  UIKit                               0x00000001014cf1d0 -[UIWindow sendEvent:] + 865
    11  UIKit                               0x000000010147db66 -[UIApplication sendEvent:] + 263
    12  UIKit                               0x0000000101457d97 _UIApplicationHandleEventQueue + 6844
    13  CoreFoundation                      0x0000000100b6ca31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    14  CoreFoundation                      0x0000000100b6295c __CFRunLoopDoSources0 + 556
    15  CoreFoundation                      0x0000000100b61e13 __CFRunLoopRun + 867
    16  CoreFoundation                      0x0000000100b61828 CFRunLoopRunSpecific + 488
    17  GraphicsServices                    0x0000000105256ad2 GSEventRunModal + 161
    18  UIKit                               0x000000010145d610 UIApplicationMain + 171
    19  Calculator                          0x0000000100a6361d main + 109
    20  libdyld.dylib                       0x000000010348992d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

我的主类只有这个简单的方法不知道发生了什么

import UIKit

internal class ViewController : UIViewController {

    @IBAction internal func touchDigit(sender: UIButton)
}

谢谢

Answer 1

尝试在 Storyboard/xib 中取消绑定(bind)您的操作，然后重新绑定(bind)它。

我根据错误中缺少的 : 进行猜测(它应该是 [ViewController touchDigit:] 因为有一个参数)，你添加了参数 sender after 在 Storyboard中设置它。

我自己测试了这个，当重新绑定(bind)它时， Storyboard将它显示为 touchDigitWithSender，即使它保留名称 touchDigit。可能是一些奇怪的 Swift/Objective-C 互操作性问题。

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附言internal 是默认的访问说明符，您不必将它添加到每个声明中