iphone - EXC_BAD_ACCESS 无法识别的选择器发送到实例

Question

//adds a button to scroll list  
-(void) addNode:(NSString *) atitle{  
     UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];  
     [btn setTitle:atitle forState:UIControlStateNormal];  
     [btn addTarget:self action:@selector(buttonTouched:)   forControlEvents:UIControlEventTouchUpInside]; // handle touch  
     [buttons addObject:btn];  
....
}

//a data button was pressed  
-(void) buttonTouched:(id)sender{  
   int index = [buttons indexOfObject:sender];  
   NSString *key = [sender titleLabel].text;  
}  

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate>

-(id) init{  
    self = [super init];  
    ...  
}  

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.  
- (void)viewDidLoad {  
 [super viewDidLoad];  
 [[NSNotificationCenter defaultCenter] postNotificationName:@"ViewDidLoad" object:nil];  
}  

-(void) awakeFromNib{  
 [self loadData]; // loads some data  
  //calls addNode for a bunch of dynamic data
}  

<小时/>

出现此错误:

2010-07-29 10:19:45.428 DataManager[2945:207] -[NSCFString buttonTouched:]: unrecognized selector sent to instance 0x593abb0  
2010-07-29 10:19:45.429 DataManager[2945:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString buttonTouched:]: unrecognized selector sent to instance 0x593abb0'  
*** Call stack at first throw:  
(  
 0   CoreFoundation                      0x02399919 __exceptionPreprocess + 185  
 1   libobjc.A.dylib                     0x024e75de objc_exception_throw + 47  
 2   CoreFoundation                      0x0239b42b -[NSObject(NSObject)   doesNotRecognizeSelector:] + 187  
 3   CoreFoundation                      0x0230b116 ___forwarding___ + 966  
 4   CoreFoundation                      0x0230acd2 _CF_forwarding_prep_0 + 50  
 5   UIKit                               0x002bde14 -[UIApplication  sendAction:to:from:forEvent:] + 119  
 6   UIKit                               0x003476c8 -[UIControl sendAction:to:forEvent:] + 67  
 7   UIKit                               0x00349b4a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527  
 8   UIKit                               0x003486f7 -[UIControl touchesEnded:withEvent:] + 458  
 9   UIKit                               0x00535070 _UIGestureRecognizerUpdateObserver + 3687  
 10  CoreFoundation                      0x0237ad1b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27  
 11  CoreFoundation                      0x0230f987 __CFRunLoopDoObservers + 295  
 12  CoreFoundation                      0x022d8c17 __CFRunLoopRun + 1575  
 13  CoreFoundation                      0x022d8280 CFRunLoopRunSpecific + 208  
 14  CoreFoundation                      0x022d81a1 CFRunLoopRunInMode + 97  
 15  GraphicsServices                    0x02bfe2c8 GSEventRunModal + 217  
 16  GraphicsServices                    0x02bfe38d GSEventRun + 115  
 17  UIKit                               0x002cbb58 UIApplicationMain + 1160  
 18  DataManager                         0x00002940 main + 102  
 19  DataManager                         0x000028d1 start + 53  
)  
terminate called after throwing an instance of 'NSException'  
Program received signal:  “SIGABRT”.  
kill  
kill  

The Debugger has exited due to signal 15 (SIGTERM).The Debugger has exited due to signal 15 (SIGTERM). 

Answer 1

在将操作添加到按钮之前，我确实添加了 [self keep];，现在它可以工作了!

-(void) addNode:(NSString *) atitle{  
UIButton *btn = [UIButton   buttonWithType:UIButtonTypeRoundedRect];  
    [btn setTitle:atitle forState:UIControlStateNormal];  
    [self retain];  
    [btn addTarget:self action:@selector(buttonTouched:) forControlEvents:UIControlEventTouchUpInside]; // handle touch  

有什么理由吗？
self 是处理一切的 UIViewController (至少我是这么认为的)