选择两次相同的行时，UITableView崩溃 [英] UITableView crashes when the same row is selected twice
问题描述
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。当我回击然后选择相同的行。它在行tableController.empInfo = employee;崩溃了。我收到一个EXC_BAD_ACCESS错误
When i run the app and select a row it passes some information to EmployeeInfoPage and works fine. When i hit back and then select the same row. It crashes at the line tableController.empInfo = employee;. I get a EXC_BAD_ACCESS error
- (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
This is the EmployeeInfoTableView.h file
@interface EmployeeInfoTableView : UITableViewController <UIActionSheetDelegate , MFMailComposeViewControllerDelegate, MFMessageComposeViewControllerDelegate>{
NSDictionary *empInfo;
NSString *currentPhoneNumber;
NSString *currentEmail;
UIActionSheet *callConfirm;
}
然后我使用empInfo在tableview中设置某些字段。
Then i use empInfo to set certain fields in the tableview.
这是我的dealloc方法
This is my dealloc method
- (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物品吗？
Is my error becuase i need to release any of my objects?
这是我从iPhone上得到的错误，我真的不知道怎么读这个。
This is the error i got from off my iPhone, i really have no idea how to read this.
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
cpsr: 0x00000030
推荐答案
尝试删除此行
[tableController release];
。当我们尝试访问先前发布的变量时，抛出 EXC_BAD_ACCESS 错误。您同时使用 tableController 发布 NSDictionary * employee 对象。
from your didSelectRowAtIndexPath method. The EXC_BAD_ACCESS error is thrown when we try to access a variable that was released previously. You're simultaneously releasing NSDictionary *employee object with tableController.
编辑：为防止您的词典被释放，您可以复制字典所需的内容为 tableController.empInfo = [员工复制] ; 然后发布最适合这种情况的 tableController 。
To prevent your dictionary from being released, you can copy the required contents of the dictionary as tableController.empInfo = [employee copy]; and then release tableController which would suit this situation best.
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