iphone ios XCode4如何调试程序忽然崩溃而找不到挂的代码

XCode4设置不太一样: 在Edit–>Scheme里面 找到Arguments(在xcode 4.2中，在菜单 product->edit scheme中）





把下面3个值设置成YES

NSAutoreleaseFreedObjectCheckEnabled

NSZombieEnabled

NSDebugEnabled
另外转载2篇调试EXC_BAD_ACCESS的好文 http://blog.zol.com.cn/2387/article_2386505.html http://www.cnblogs.com/likwo/archive/2011/02/28/1967066.html
老外也有这么说的：
I had similar issue; turns out I was
not retaining a UIButton properly. How I found the cause: - Enable zombies - Run the project with 'Allocations' instrument - Use the app to trigger the bug - Check that Instruments show message 'Zombie Messaged' on the timeline - There should be a link that
opens CALayer details: when it was allocated and deallocated - You are interested in the place where is was allocated, should be that aha!!! place in your code

我是用模拟器上 使用zombies，然后运行程序，崩溃的时候会有提示崩溃点，同时有代码。

转另一个人文章：

方法一：

PAEHoldTranMainControl *control = [[PAEHoldTranMainControl alloc]init];
[self.navigationController pushViewController:control animated:YES];

[control release];

alloc了一个control,release,运行就崩溃了。而且没有任何提示，console里只显示exc_bad_access

利用NSZombieEnabled参数，MallocStackLogging参数，显示 -[CALayer release]: message sent to deallocated instance 0x13570810

折腾了半天，最后用如下方法定位问题：

打开instrument-->ios simulator：

选择all－－》 zombies运行，断开时，查看stack trace，即可跟踪

方法二：例如console里的输出如下：

TestAPP[1472:207] *** -[NSObject release]: message sent to deallocated instance 0x6019170

在 gdb console 里面， 运行 shell malloc_history <pid> <mem_address>

pid = process ID (e.g. 1472)

mem_address = memory address of instance (e.g. 0x6019170)

即会出现调用栈