我有一个对象，类似于UIAlertView显示带有自定义消息和标题的对话框。到目前为止，以下代码用于显示对话框：
DialogBox *dialog = [[DialogBox alloc] initWithMessage:@"Hello" delegate:self];
[dialog showDialog];
但是，当我点击对话框上的“是”或“否”按钮时，应用程序崩溃，因为DialogBox实例已被释放。
将 *dialog 实例变量设为属性可以解决此问题，但这对我不起作用，因为我希望能够随机创建DialogBox实例变量。
有没有办法让 *dialog 实例变量“活着”，直到我希望它真正从视图中消失？
任何帮助将不胜感激。
Crash log below:
Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x000000005f7b5e7d
VM Regions Near 0x5f7b5e7d:
MALLOC_TINY 000000000ea00000-000000000eb00000 [ 1024K] rw-/rwx SM=PRV
-->
__TEXT 000000008fea8000-000000008fedb000 [ 204K] r-x/rwx SM=COW /usr/lib/dyld
Application Specific Information:
objc_msgSend() selector name: performSelector:withObject:withObject:
iPhone Simulator 369.2, iPhone OS 6.1 (iPhone/10B5126b)
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x010e60b0 objc_msgSend + 36
1 UIKit 0x0001c2c0 -[UIApplication sendAction:to:from:forEvent:] + 96
2 UIKit 0x0001c258 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
3 UIKit 0x000dd021 -[UIControl sendAction:to:forEvent:] + 66
4 UIKit 0x000dd57f -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 578
5 UIKit 0x000dc6e8 -[UIControl touchesEnded:withEvent:] + 546
6 UIKit 0x0004bcef -[UIWindow _sendTouchesForEvent:] + 846
7 UIKit 0x0004bf02 -[UIWindow sendEvent:] + 273
8 UIKit 0x00029d4a -[UIApplication sendEvent:] + 436
9 UIKit 0x0001b698 _UIApplicationHandleEvent + 9874
10 GraphicsServices 0x01bf2df9 _PurpleEventCallback + 339
11 GraphicsServices 0x01bf2ad0 PurpleEventCallback + 46
12 CoreFoundation 0x01c0cbf5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
13 CoreFoundation 0x01c0c962 __CFRunLoopDoSource1 + 146
14 CoreFoundation 0x01c3dbb6 __CFRunLoopRun + 2118
15 CoreFoundation 0x01c3cf44 CFRunLoopRunSpecific + 276
16 CoreFoundation 0x01c3ce1b CFRunLoopRunInMode + 123
17 GraphicsServices 0x01bf17e3 GSEventRunModal + 88
18 GraphicsServices 0x01bf1668 GSEventRun + 104
19 UIKit 0x00018ffc UIApplicationMain + 1211
20 DialogApp 0x0000257d main + 141 (main.m:16)
21 DialogApp 0x000024a5 start + 53
Thread 1:
0 libsystem_kernel.dylib 0x998580ee __workq_kernreturn + 10
1 libsystem_c.dylib 0x9214904c _pthread_workq_return + 45
2 libsystem_c.dylib 0x92148e19 _pthread_wqthread + 448
3 libsystem_c.dylib 0x92130cca start_wqthread + 30
Thread 2:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x998589ca kevent64 + 10
1 libdispatch.dylib 0x049fec2b _dispatch_mgr_invoke + 863
2 libdispatch.dylib 0x049fe8cc _dispatch_mgr_thread + 61
Thread 3:
0 libsystem_kernel.dylib 0x998580ee __workq_kernreturn + 10
1 libsystem_c.dylib 0x9214904c _pthread_workq_return + 45
2 libsystem_c.dylib 0x92148e19 _pthread_wqthread + 448
3 libsystem_c.dylib 0x92130cca start_wqthread + 30
Thread 4:
0 libsystem_kernel.dylib 0x998580ee __workq_kernreturn + 10
1 libsystem_c.dylib 0x9214904c _pthread_workq_return + 45
2 libsystem_c.dylib 0x92148e19 _pthread_wqthread + 448
3 libsystem_c.dylib 0x92130cca start_wqthread + 30
Thread 5:: WebThread
0 libsystem_kernel.dylib 0x998557d2 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x99854cb0 mach_msg + 68
2 CoreFoundation 0x01c38a49 __CFRunLoopServiceMachPort + 185
3 CoreFoundation 0x01c3d8d4 __CFRunLoopRun + 1380
4 CoreFoundation 0x01c3cf44 CFRunLoopRunSpecific + 276
5 CoreFoundation 0x01c3ce1b CFRunLoopRunInMode + 123
6 WebCore 0x0356dc50 RunWebThread(void*) + 608
7 libsystem_c.dylib 0x92146557 _pthread_start + 344
8 libsystem_c.dylib 0x92130cee thread_start + 34
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x5f7b5e7d ebx: 0x0001c26e ecx: 0x00cb6b07 edx: 0x00005240
edi: 0x012cfd4f esi: 0x694c534e ebp: 0xbfffe108 esp: 0xbfffe0d4
ss: 0x00000023 efl: 0x00010206 eip: 0x010e60b0 cs: 0x0000001b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f
cr2: 0x5f7b5e7d
Logical CPU: 1