当同一行被选择两次时 UITableView 崩溃

Question

当我运行应用程序并选择一行时，它会将一些信息传递给 EmployeeInfoPage 并且工作正常。当我回击然后选择同一行时。它在 tableController.empInfo = employee; 行崩溃。我收到 EXC_BAD_ACCESS 错误

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{   
EmployeeInfoTableView *tableController = [[EmployeeInfoTableView alloc] init];

NSDictionary *employee = [[self.orderedSections valueForKey:[[[self.orderedSections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];

tableController.empInfo = employee;    

[self.navigationController pushViewController:tableController animated:YES];    

[tableController release];
}

这是 EmployeeInfoTableView.h 文件

@interface EmployeeInfoTableView : UITableViewController <UIActionSheetDelegate , MFMailComposeViewControllerDelegate, MFMessageComposeViewControllerDelegate>{

    NSDictionary *empInfo;
    NSString *currentPhoneNumber;
    NSString *currentEmail;

    UIActionSheet *callConfirm;
}

然后我使用 empInfo 在表视图中设置某些字段。

这是我的 dealloc 方法，

- (void)dealloc{
    [super dealloc];
    [empInfo dealloc];
    [currentEmail dealloc];
    [currentPhoneNumber dealloc];
    [callConfirm dealloc];
}

我的错误是因为我需要释放我的任何对象吗？

这是我从 iPhone 上收到的错误，我真的不知道如何阅读。

  Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xb001fb49
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libobjc.A.dylib                 0x31798c98 objc_msgSend + 16
1   libobjc.A.dylib                 0x317a24d2 objc_setProperty_non_gc + 62
2   libobjc.A.dylib                 0x3179a040 objc_setProperty + 20
3   CorporateDirectory              0x0000e5f0 0x1000 + 54768
4   CorporateDirectory              0x00003ac2 0x1000 + 10946
5   UIKit                           0x32cc3514 -[UITableView                                         _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 656
6   UIKit                           0x32d270e4 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 124
7   Foundation                      0x338266ce __NSFireDelayedPerform + 362
8   CoreFoundation                  0x345f4a40     __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8
9   CoreFoundation                  0x345f6ec4 __CFRunLoopDoTimer + 844
10  CoreFoundation                  0x345f783e __CFRunLoopRun + 1082
11  CoreFoundation                  0x34587ebc CFRunLoopRunSpecific + 224
12  CoreFoundation                  0x34587dc4 CFRunLoopRunInMode + 52
13  GraphicsServices                0x322b2418 GSEventRunModal + 108
14  GraphicsServices                0x322b24c4 GSEventRun + 56
15  UIKit                           0x32c9dd62 -[UIApplication _run] + 398
16  UIKit                           0x32c9b800 UIApplicationMain + 664
17  CorporateDirectory              0x00002a52 0x1000 + 6738
18  CorporateDirectory              0x00002a10 0x1000 + 6672




Thread 1:
0   libsystem_kernel.dylib          0x339663ec __workq_kernreturn + 8
1   libsystem_c.dylib               0x3480f6d8 _pthread_wqthread + 592
2   libsystem_c.dylib               0x3480fbbc start_wqthread + 0

Thread 2 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 2:
0   libsystem_kernel.dylib          0x33966fbc kevent + 24
1   libdispatch.dylib               0x322df032 _dispatch_mgr_invoke + 706
2   libdispatch.dylib               0x322e003a _dispatch_queue_invoke + 86
3   libdispatch.dylib               0x322df5ea _dispatch_worker_thread2 + 186
4   libsystem_c.dylib               0x3480f58a _pthread_wqthread + 258
5   libsystem_c.dylib               0x3480fbbc start_wqthread + 0

Thread 3 name:  WebThread
Thread 3:
0   libsystem_kernel.dylib          0x33963c00 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x33963758 mach_msg + 44
2   CoreFoundation                  0x345f52b8 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x345f7562 __CFRunLoopRun + 350
4   CoreFoundation                  0x34587ebc CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x34587dc4 CFRunLoopRunInMode + 52
6   WebCore                         0x3666927e _ZL12RunWebThreadPv + 382
7   libsystem_c.dylib               0x3480e30a _pthread_start + 242
8   libsystem_c.dylib               0x3480fbb4 thread_start + 0

Thread 0 crashed with ARM Thread State:
r0: 0x0016c020    r1: 0x32f63814      r2: 0x000000a8      r3: 0x0016c020
r4: 0xb001fb41    r5: 0x00000000      r6: 0x001eeca8      r7: 0x2fdfe8c4
r8: 0x00a1da00    r9: 0x0016c020     r10: 0x00000003     r11: 0x00161a50
ip: 0x00000000    sp: 0x2fdfe8a4      lr: 0x317a24d9      pc: 0x31798c98

cpsr：0x00000030

Answer 1

我没有看到你的 didSelectRowAtIndexPath 有什么问题，但你的 dealloc 方法肯定不正确。 永远不要在代码中调用dealloc（即仅在使用完对象后才释放它们）。

你的 dealloc 方法应该如下所示：

- (void)dealloc{
    [empInfo release];
    [currentEmail release];
    [currentPhoneNumber release];
    [callConfirm release];
    [super dealloc];
}

Answer 2

删除此行

[tableController release];

尝试从didSelectRowAtIndexPath 方法中 。当我们尝试访问之前释放的变量时，会引发EXC_BAD_ACCESS错误。您正在使用 tableController 同时释放 NSDictionary *employee 对象。

编辑：为了防止您的字典被释放，您可以复制字典所需的内容为tableController.empInfo = [employee copy];，然后释放tableController 最适合这种情况。