带有 IBACTION 的 EXC_BAD_ACCESS [英] EXC_BAD_ACCESS with IBACTION

问题描述

我已经阅读了很多关于这个问题的信息，但我的似乎仍然有所不同.所以据我了解，EXC_BAD_ACCESS 会出现内存管理问题.

I have read a lot about this issue but mine still seems to be different somehow. So from what I understood, EXC_BAD_ACCESS occurs with memory management problems.

问题是，我的似乎 (!:)) 不在那里.问题是，我简单地在 IB 中添加了一个按钮，圆角矩形，没有图像.我将它与我在课堂上定义的 IBACTION 连接起来.顺便说一下，这个方法什么都不做(！).

The thing is, mine does not seem (! :)) to be there. The thing is, I simple added a button in IB, rounded rect, no image. The I hooked it up with an IBACTION I defined in my class. This method does nothing (!) by the way.

无论如何，只要我点击按钮，应用程序就会崩溃，并显示EXC_BAD_ACCESS".

Anyway, as soon as I click the button, the App crashes, with "EXC_BAD_ACCESS".

据我所知，我肯定不会过度发布任何东西.有什么问题?

I am surely not overreleasing anything, as far as I can see, that is. What is wrong there?

有什么线索吗?

这是我的控制台日志:

Loading program into debugger…
sharedlibrary apply-load-rules all
Program loaded.
target remote-mobile /tmp/.XcodeGDBRemote-148-79
Switching to remote-macosx protocol
mem 0x1000 0x3fffffff cache
mem 0x40000000 0xffffffff none
mem 0x00000000 0x0fff none
run
Running…
[Switching to thread 11779]
[Switching to thread 11779]
(gdb) continue
2010-01-15 09:16:34.800 FlightControl1[1899:207] Table loaded
2010-01-15 09:16:35.200 FlightControl1[1899:207] 23
2010-01-15 09:16:35.350 FlightControl1[1899:207] debug
Program received signal:  "EXC_BAD_ACCESS".
(gdb) 

这是我上栈后得到的:

#0  0x31ec3ebc in objc_msgSend ()
#1  0x33605784 in -[UIApplication sendAction:to:from:forEvent:] ()
#2  0x336056ec in -[UIApplication sendAction:toTarget:fromSender:forEvent:] ()
#3  0x336056b4 in -[UIControl sendAction:to:forEvent:] ()
#4  0x3360530c in -[UIControl(Internal) _sendActionsForEvents:withEvent:] ()
#5  0x33605f8c in -[UIControl touchesEnded:withEvent:] ()
#6  0x335fd9ac in _UIGestureRecognizerUpdateObserver ()
#7  0x30da1830 in __CFRunLoopDoObservers ()
#8  0x30de9346 in CFRunLoopRunSpecific ()
#9  0x30de8c1e in CFRunLoopRunInMode ()
#10 0x332e7374 in GSEventRunModal ()
#11 0x335adc30 in -[UIApplication _run] ()
#12 0x335ac230 in UIApplicationMain ()
#13 0x000027a8 in main (argc=1, argv=0x2ffff4d8) at /Users/SomePath/main.m:14

推荐答案

我也被这个折磨了几个小时.正如预期的那样，结果是内存问题.作为按钮目标的控制器已被释放.它是导航控制器的根控制器，其视图直接添加到窗口中.我的代码如下所示:

I was tortured by this for a few hours as well. It turned out to be a memory problem as expected. The controller acting as the target for the button was deallocated. It was the root controller of a navigation controller whose view was added directly to the window. My code looked like this:

MyController *myController = [[MyController new] autorelease];
UINavigationController* navController = 
    [[[UINavigationController alloc] initWithRootViewController:myController] autorelease];
[window addSubview:navController.view];

我的假设是 myController 在作为 UINavigationController 的根控制器传递时会被保留，但结果证明这是错误的.解决方案是将控制器分配给一个局部变量并在 dealloc 中释放它.包含上述代码的对象的接口应该有:

My assumption was that myController would be retained when it's passed as the root controller of the UINavigationController, but that turned out to be wrong. The solution was to assign the controller to a local variable and release it in dealloc. The interface of the object containing the above code should have:

...
@property (retain, nonatomic) MyController *myController;
...

以及实现:

self.myController = [[MyController new] autorelease];
UINavigationController* navController = 
    [[[UINavigationController alloc] initWithRootViewController:myController] autorelease];
[window addSubview:navController.view];

...

- (void)dealloc {
    [self.myController release];
    ...
    [super dealloc];
}

这篇关于带有 IBACTION 的 EXC_BAD_ACCESS的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！