Question

我一直在阅读很多类似的问题和答案，但仍然不太明白这里出了什么问题。

我正在尝试创建一个按钮以返回上一个视图，但我不断收到标题中提到的错误。有人可以告诉我我做错了什么吗？

 UIImage *image = [UIImage imageNamed:@"listbutton.png"];
UIButton *listbutton = [UIButton buttonWithType:UIButtonTypeCustom];
listbutton.bounds = CGRectMake( 0, 0, image.size.width, image.size.height );
[listbutton setImage:image forState:UIControlStateNormal];
[listbutton addTarget:self action:@selector(goBack:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:listbutton];

GoBack的：

- (void)goBack
{
[self.navigationController popViewControllerAnimated:YES];
}

错误：

2014-01-05 22：03：13.344 tablepractice [12509：70b]    - [DetailViewController goBack：]：无法识别的选择器发送到实例0x8b72130 2014-01-05 22：03：13.348 tablepractice [12509：70b]    *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' - [DetailViewController   goBack：]：无法识别的选择器发送到实例0x8b72130'   * 第一次抛出调用堆栈：（0 CoreFoundation 0x017405e4 exceptionPreprocess + 180 1 libobjc.A.dylib
  0x014c38b6 objc_exception_throw + 44 2 CoreFoundation
  0x017dd903 - [NSObject（NSObject）doesNotRecognizeSelector：] + 275 3
  CoreFoundation 0x0173090b __ 转发 + 1019     4 CoreFoundation 0x017304ee   _CF_forwarding_prep_0 + 14 5 libobjc.A.dylib 0x014d5874 - [NSObject performSelector：withObject：withObject：] + 77 6   UIKit 0x002330c2 - [UIApplication   sendAction：to：from：forEvent：] + 108 7 UIKit
  0x0023304e - [UIApplication sendAction：toTarget：fromSender：forEvent：] +   61 8 UIKit 0x0032b0c1 - [UIControl   sendAction：to：forEvent：] + 66 9 UIKit
  0x0032b484 - [UIControl _sendActionsForEvents：withEvent：] + 577 10   UIKit 0x0032a733 - [UIControl   touchesEnded：withEvent：] + 641 11 UIKit
  0x0027051d - [UIWindow _sendTouchesForEvent：] + 852 12 UIKit
  0x00271184 - [UIWindow sendEvent：] + 1232 13 UIKit
  0x00244e86 - [UIApplication sendEvent：] + 242 14 UIKit
  0x0022f18f _UIApplicationHandleEventQueue + 11421 15 CoreFoundation   0x016c983f CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION   + 15 16 CoreFoundation 0x016c91cb __CFRunLoopDoSources0 + 235 17 CoreFoundation 0x016e629e __CFRunLoopRun + 910 18 CoreFoundation
  0x016e5ac3 CFRunLoopRunSpecific + 467 19 CoreFoundation
  0x016e58db CFRunLoopRunInMode + 123 20图形服务
  0x036e59e2 GSEventRunModal + 192 21 GraphicsServices
  0x036e5809 GSEventRun + 104 22 UIKit
  0x00231d3b UIApplicationMain + 1225 23 tablepractice
  0x0000388d main + 141 24 libdyld.dylib
  0x01d7e70d开始+ 1 25 ???   0x00000001 0x0 + 1）libc ++ abi.dylib：以未捕获终止   NSException类型的异常

Answer 1

[listbutton addTarget:self action:@selector(goBack:) forControlEvents:UIControlEventTouchUpInside];

这需要更改为在选择器方法中不使用冒号：

[listbutton addTarget:self action:@selector(goBack) forControlEvents:UIControlEventTouchUpInside];

冒号表示有一个参数，而你的goBack方法没有参数。

未声明的选择器goBack警告和无法识别的选择器发送到实例终止

1 个答案: