EXC_BAD_ACCESS无法识别的选择发送到实例

问题描述:

//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 
} 

收到此错误:EXC_BAD_ACCESS无法识别的选择发送到实例

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). 

buttons你初始化(我假设,因为你正在使用addObject这是唯一的数组)的数组?你说它应该把它添加到一个滚动列表中(我猜你的意思是一个滚动视图),但是你给的错误使得它看起来像你将它传递给一个字符串对象。

要添加到滚动视图,你会怎么做:

[someScrollview addSubview:btn]; 

而且,我没有看到任何地方,你设置的对象,当它被添加到滚动视图的框架。这是你在将它作为子视图添加之前需要做的事情。

工作得很好,对我来说(注意,你应该初始化和地方释放可变数组,我只是做这个快):

控制台输出= 2010-07-29 15:54:54.563火炬[52222 :207]是的Hi和我用0

代码:

NSMutableArray *buttons; // in your .h interface 

@property (nonatomic, retain) NSMutableArray *buttons; // in your .h 

@synthesize buttons; // in your .m 

(...)

-(IBAction) pushMyButtons { 
buttons = [[NSMutableArray alloc] init]; 

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
[btn setTitle:@"Hi" forState:UIControlStateNormal]; 
[btn setFrame:CGRectMake(65, 300, 200, 23)]; 
[btn addTarget:self action:@selector(buttonTouched:) forControlEvents:UIControlEventTouchUpInside]; // handle touch 
[buttons addObject:btn]; 
[self.view addSubview:btn]; 
} 

//a data button was pressed 
-(void) buttonTouched:(id)sender{ 

int index = [buttons indexOfObject:sender]; 
NSString *key = [sender titleLabel].text; 
NSLog(@"Yep %@ and %d", key, index); 

} 
+0

我的不好。我是新手。初始化期间是按钮阵列启动。是[scrollview addSubview:btn]。问题是当我按动态添加按钮。 – 2010-07-29 19:36:01

+0

没有概率,只是试图获得尽可能多的信息:)看到我更新后的帖子,这对我来说很好。不是将它添加到scrollview中,而是将它添加到视图中,但实际上没有区别在两个。我制作了我的按钮标题“Hi” – iwasrobbed 2010-07-29 19:59:56

+0

由于某种原因没有工作。不过谢谢。见上面的答案。 – 2010-07-30 14:37:19

我在添加动作到按钮之前添加了[self retain];,现在它可以工作!

-(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 

任何原因为什么?
自我是如果你正在使用ARC编译并通过编程设置选择,处理一切(至少我认为)

+0

调用'[self retain];'打开大内存泄漏的大门,因为您将视图控制器的'retainCount'加1,并且永远不会再次释放该对象。这与动态创建按钮无关。 – iwasrobbed 2010-07-30 14:59:30

+0

建议呢? – 2010-07-30 16:14:28

UIViewController

[_backButton addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside]; 

的EXC_BAD_ACCESS因为我创造了一个父时,我然后将子视图添加到另一个视图。子视图(使用按钮)有其父级版本。一切都很好,直到按钮被选中,然后崩溃。

选择器的任何异常都可能是类发布问题。不应将保留用作工作(当然,在ARC编译中,您不能使用保留)。代码应该在可能释放对象的父对象的函数中检查可能的寡居指针。

希望有所帮助。