我在客户 iPhone（运行 iOS 5.1）上发生了奇怪的崩溃，我在 iOS 6 上使用以下代码完全没有问题：
- (IBAction)projectButtonPressed:(id)sender
{
MEProjectViewController *viewController = [[MEProjectViewController alloc] initWithNibName:@"MEProjectViewController" bundle:nil];
MEProjectNavigationViewController *navigationController = [[MEProjectNavigationViewController alloc] initWithRootViewController:viewController];
navigationController.navigationBar.barStyle = UIBarStyleBlack;
//iOS 6
if ([self respondsToSelector:@selector(presentViewController:animated:completion:)])
[self presentViewController:navigationController animated:YES completion:NULL];
else
[self presentModalViewController:navigationController animated:YES];
}
崩溃日志将右花括号显示为导致崩溃的行：
Incident Identifier: F261ECD3-29DF-4360-B5AB-6C1DD0906D6A
CrashReporter Key: cce2db7ca2a68093009446fb47f71ea8c3991922
Hardware Model: iPhone4,1
Process: MagicEye-iPhone [855]
Path: /var/mobile/Applications/1D9D4CB5-FA72-41A5-B9A7-D44BBB2417E2/MagicEye-iPhone.app/MagicEye-iPhone
Identifier: MagicEye-iPhone
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-01-07 20:14:12.348 +0000
OS Version: iPhone OS 5.1 (9B179)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x378eb88f 0x37832000 + 759951
1 libobjc.A.dylib 0x35df1259 0x35de8000 + 37465
2 CoreFoundation 0x378eb789 0x37832000 + 759689
3 CoreFoundation 0x378eb7ab 0x37832000 + 759723
4 UIKit 0x3427e639 0x33f94000 + 3057209
5 UIKit 0x3427e7a7 0x33f94000 + 3057575
6 UIKit 0x3427e50f 0x33f94000 + 3056911
7 UIKit 0x3420f0ed 0x33f94000 + 2601197
8 UIKit 0x3417d4b3 0x33f94000 + 2004147
9 UIKit 0x3405ae01 0x33f94000 + 814593
10 UIKit 0x33fd0dbf 0x33f94000 + 249279
11 UIKit 0x33ff5629 0x33f94000 + 398889
12 UIKit 0x33fb9d7d 0x33f94000 + 155005
13 UIKit 0x3407c4dd 0x33f94000 + 951517
14 UIKit 0x33fc255d 0x33f94000 + 189789
15 UIKit 0x33fc240b 0x33f94000 + 189451
16 UIKit 0x3407c4a3 0x33f94000 + 951459
17 UIKit 0x34031873 0x33f94000 + 645235
18 UIKit 0x340311b7 0x33f94000 + 643511
19 UIKit 0x3407ad89 0x33f94000 + 945545
20 UIKit 0x340794eb 0x33f94000 + 939243
21 MagicEye-iPhone 0x00069e21 -[MEMainViewViewController_iPhone projectButtonPressed:] (MEMainViewViewController_iPhone.m:203)
22 CoreFoundation 0x378453fd 0x37832000 + 78845
23 UIKit 0x33fb2faf 0x33f94000 + 126895
24 UIKit 0x33fb2f6b 0x33f94000 + 126827
25 UIKit 0x33fb2f49 0x33f94000 + 126793
26 UIKit 0x33fb2cb9 0x33f94000 + 126137
27 UIKit 0x33fb35f1 0x33f94000 + 128497
28 UIKit 0x33fb1ad3 0x33f94000 + 121555
29 UIKit 0x33fb14c1 0x33f94000 + 120001
30 UIKit 0x33f9783d 0x33f94000 + 14397
31 UIKit 0x33f970e3 0x33f94000 + 12515
32 GraphicsServices 0x3274f22b 0x3274a000 + 21035
33 CoreFoundation 0x378bf523 0x37832000 + 578851
34 CoreFoundation 0x378bf4c5 0x37832000 + 578757
35 CoreFoundation 0x378be313 0x37832000 + 574227
36 CoreFoundation 0x378414a5 0x37832000 + 62629
37 CoreFoundation 0x3784136d 0x37832000 + 62317
38 GraphicsServices 0x3274e439 0x3274a000 + 17465
39 UIKit 0x33fc5e7d 0x33f94000 + 204413
40 MagicEye-iPhone 0x00028937 main (main.m:16)
41 MagicEye-iPhone 0x000288d0 start + 40
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x35d6a32c 0x35d59000 + 70444
1 libsystem_c.dylib 0x31eb8208 0x31e6b000 + 315912
2 libsystem_c.dylib 0x31eb1298 0x31e6b000 + 287384
3 libc++abi.dylib 0x354bdf64 0x354b7000 + 28516
4 libc++abi.dylib 0x354bb346 0x354b7000 + 17222
5 libobjc.A.dylib 0x35df1350 0x35de8000 + 37712
6 libc++abi.dylib 0x354bb3be 0x354b7000 + 17342
7 libc++abi.dylib 0x354bb44a 0x354b7000 + 17482
8 libc++abi.dylib 0x354bc81e 0x354b7000 + 22558
9 libobjc.A.dylib 0x35df12a2 0x35de8000 + 37538
10 CoreFoundation 0x37841506 0x37832000 + 62726
11 CoreFoundation 0x37841366 0x37832000 + 62310
12 GraphicsServices 0x3274e432 0x3274a000 + 17458
13 UIKit 0x33fc5e76 0x33f94000 + 204406
14 MagicEye-iPhone 0x00028930 main (main.m:16)
15 MagicEye-iPhone 0x000288c8 start + 32
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x35d5a3a8 0x35d59000 + 5032
1 libdispatch.dylib 0x34b44f04 0x34b41000 + 16132
2 libdispatch.dylib 0x34b44c22 0x34b41000 + 15394
Thread 2:
0 libsystem_kernel.dylib 0x35d6acd4 0x35d59000 + 72916
1 libsystem_c.dylib 0x31e73f36 0x31e6b000 + 36662
2 libsystem_c.dylib 0x31e73cc8 0x31e6b000 + 36040
Thread 3:
0 libsystem_kernel.dylib 0x35d6acd4 0x35d59000 + 72916
1 libsystem_c.dylib 0x31e73f36 0x31e6b000 + 36662
2 libsystem_c.dylib 0x31e73cc8 0x31e6b000 + 36040
Thread 4 name: WebThread
Thread 4:
0 libsystem_kernel.dylib 0x35d5a004 0x35d59000 + 4100
1 libsystem_kernel.dylib 0x35d5a1fa 0x35d59000 + 4602
2 CoreFoundation 0x378bf3ec 0x37832000 + 578540
3 CoreFoundation 0x378be124 0x37832000 + 573732
4 CoreFoundation 0x3784149e 0x37832000 + 62622
5 CoreFoundation 0x37841366 0x37832000 + 62310
6 WebCore 0x335010f0 0x33458000 + 692464
7 libsystem_c.dylib 0x31e7972e 0x31e6b000 + 59182
8 libsystem_c.dylib 0x31e795e8 0x31e6b000 + 58856
Thread 5 name: com.apple.CFSocket.private
Thread 5:
0 libsystem_kernel.dylib 0x35d6a570 0x35d59000 + 71024
1 CoreFoundation 0x378c363a 0x37832000 + 595514
2 libsystem_c.dylib 0x31e7972e 0x31e6b000 + 59182
3 libsystem_c.dylib 0x31e795e8 0x31e6b000 + 58856
Thread 0 crashed with ARM Thread State:
r0: 0x00000000 r1: 0x00000000 r2: 0x00000001 r3: 0x00000000
r4: 0x00000006 r5: 0x3edc8d98 r6: 0x00000002 r7: 0x2fe24a58
r8: 0x00000000 r9: 0x00000000 r10: 0x3f560f60 r11: 0x00000024
ip: 0x00000148 sp: 0x2fe24a4c lr: 0x31eb820f pc: 0x35d6a32c
cpsr: 0x00000010
有什么提示吗？