-3

ナビゲーションスタックでviewControllerをプッシュしています。次のビューに到達して戻ってきてからビューを再起動すると、クラッシュして終了します...コードは次のとおりです。

SampleViewController *obj=[[SampleViewController alloc]initWithNibName:nil bundle:nil];
    obj.delegate=self; 
    self.title=@"TESTT";
    [self.navigationController pushViewController:obj animated:YES];
    [obj release];

しかし、objをグローバルにすると、クラッシュは発生しません...非常に一般的なことは知っていますが、理解できません。

クラッシュログ。

Process:         INGDirectOCRSampleApp [4940]
Path:            /Users/chetna368474/Library/Application Support/iPhone Simulator/5.0/Applications/88310229-D5BA-4B1B-BBE2-F49E1C35CD25/INGDirectOCRSampleApp.app/INGDirectOCRSampleApp
Identifier:      INGDirectOCRSampleApp
Version:         ??? (???)
Code Type:       X86 (Native)
Parent Process:  launchd [1193]

Date/Time:       2012-04-06 17:48:00.057 +0530
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version:  6

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread:  0

Application Specific Information:
objc_msgSend() selector name: release
iPhone Simulator 272, iPhone OS 5.0 (iPhone/9A334)


Thread 0 Crashed:
0   libobjc.A.dylib                 0x0192209f objc_msgSend + 19
1   CoreFoundation                  0x01b30435 CFRelease + 117
2   CoreFoundation                  0x01c11e94 -[__NSArrayM dealloc] + 180
3   libobjc.A.dylib                 0x01922e4d _objc_rootRelease + 47
4   UIKit                           0x008760f9 -[UIView(Internal) _invalidateSubviewCache] + 44
5   UIKit                           0x0087142f __UIViewWillBeRemovedFromSuperview + 689
6   UIKit                           0x008710d7 -[UIView(Hierarchy) removeFromSuperview] + 70
7   UIKit                           0x0086d1e0 -[UIView dealloc] + 309
8   libobjc.A.dylib                 0x01922e4d _objc_rootRelease + 47
9   libobjc.A.dylib                 0x01922e10 objc_release + 48
10  libobjc.A.dylib                 0x01923c60 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 528
11  CoreFoundation                  0x01b58ed8 _CFAutoreleasePoolPop + 24
12  CoreFoundation                  0x01b5b83b __CFRunLoopRun + 2011
13  CoreFoundation                  0x01b5adb4 CFRunLoopRunSpecific + 212
14  CoreFoundation                  0x01b5accb CFRunLoopRunInMode + 123
15  GraphicsServices                0x0225e879 GSEventRunModal + 207
16  GraphicsServices                0x0225e93e GSEventRun + 114
17  UIKit                           0x0083aa9b UIApplicationMain + 1175
18  INGDirectOCRSampleApp           0x0000271d main + 125 (main.m:14)
19  INGDirectOCRSampleApp           0x00002695 start + 53

Thread 1:
0   libSystem.B.dylib               0x994de382 kevent + 10
1   libdispatch.dylib               0x0222f373 _dispatch_mgr_invoke + 918
2   libdispatch.dylib               0x0222dcd0 _dispatch_mgr_wakeup + 0

Thread 2:
0   libSystem.B.dylib               0x994dd412 __workq_kernreturn + 10
1   libSystem.B.dylib               0x994dd9a8 _pthread_wqthread + 941
2   libSystem.B.dylib               0x994dd5c6 start_wqthread + 30

Thread 3:
0   libSystem.B.dylib               0x994dd5a8 start_wqthread + 0

Thread 4:  WebThread
0   libSystem.B.dylib               0x994b7afa mach_msg_trap + 10
1   libSystem.B.dylib               0x994b8267 mach_msg + 68
2   CoreFoundation                  0x01bf813a __CFRunLoopServiceMachPort + 186
3   CoreFoundation                  0x01b5b605 __CFRunLoopRun + 1445
4   CoreFoundation                  0x01b5adb4 CFRunLoopRunSpecific + 212
5   CoreFoundation                  0x01b5accb CFRunLoopRunInMode + 123
6   WebCore                         0x03940220 RunWebThread(void*) + 560
7   libSystem.B.dylib               0x994e5259 _pthread_start + 345
8   libSystem.B.dylib               0x994e50de thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x08013060  ebx: 0x00000007  ecx: 0x01928405  edx: 0x0800e513
  edi: 0x00000000  esi: 0x00000008  ebp: 0xbfffde98  esp: 0xbfffde44
   ss: 0x0000001f  efl: 0x00010206  eip: 0x0192209f   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
  cr2: 0x00000000

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0x8fe00000 - 0x8fe4162b  dyld 132.1 (???) <1C06ECD9-A2D7-BB10-AF50-0F2B598A7DEC> /usr/lib/dyld
0x90f05000 - 0x90f62ff7  com.apple.framework.IOKit 2.0 (???) <3DABAB9C-4949-F441-B077-0498F8E47A35> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
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4

4 に答える 4

2

NSZombies を使用できない場合は、問題を見つけるために少し推測する必要があります...

まず、スタック トレースを逆さまにしましょう。

UIView の割り当てが解除されます (ほとんどの場合self.view)

7   UIKit                           0x0086d1e0 -[UIView dealloc] + 309
6   UIKit                           0x008710d7 -[UIView(Hierarchy) removeFromSuperview] + 70
5   UIKit                           0x0087142f __UIViewWillBeRemovedFromSuperview + 689
4   UIKit                           0x008760f9 -[UIView(Internal) _invalidateSubviewCache] + 44

この UIView はその "subviewCache" (NSArray) を解放します。これは割り当てが解除され、含まれているオブジェクトに解放メッセージを送信します。

3   libobjc.A.dylib                 0x01922e4d _objc_rootRelease + 47
2   CoreFoundation                  0x01c11e94 -[__NSArrayM dealloc] + 180
1   CoreFoundation                  0x01b30435 CFRelease + 117
0   libobjc.A.dylib                 0x0192209f objc_msgSend + 19

ほとんどの場合、既に割り当てが解除されているオブジェクトを解放しようとするため、アプリがクラッシュします。

サブビューの 1 つがオーバーリリースされたようです。

allocコードを検索して、作成者以外で作成されたが解放されたオブジェクトを探します。アナライザーがお手伝いします。

次のような間違ったコードを確認します。

UIButton *aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; // <- autoreleased
[self.view addSubview:aButton];
[aButton release];                                                     // <- released again. Wrong!

メソッドに、が含まれていない場合alloc、またはメソッドが返すオブジェクトを使用してはなりません。メソッドは自動解放されたオブジェクトを返すためです。newcopyretainrelease

于 2012-04-07T08:40:38.590 に答える
0 
SampleViewController *obj=[[SampleViewController alloc]init];
    obj.delegate=self; 
    self.title=@"TESTT";
    [self.navigationController pushViewController:obj animated:YES];
    [obj release];
于 2012-04-07T05:40:51.997 に答える
0

アプリを実行した後、dealloc 関数 (すべてのビューコントローラー) ですべてのリリースをコメントアウトし、アプリでクラッシュが見つからないことを確認する必要があるこのクラッシュを見つけるために、ある時点で何かをリリースする際に問題があると確信しています。

この時点に到達したら、dealloc 関数のコメントを 1 つずつ解除します。あなたはクラッシュを見つけます...

于 2012-04-06T13:49:08.000 に答える
0

このコードのようにそれを行うことができます

if(obj == nil)
    obj=[[SampleViewController alloc]initWithNibName:nil bundle:nil];
obj.delegate=self; 
self.title=@"TESTT";
[self.navigationController pushViewController:obj animated:YES];

オブジェクトをグローバルにします。ここでは、オブジェクトを解放する必要はありません。次回この行に出くわしたときにオブジェクトを作成して、メモリ リークの問題を解決できます。

于 2012-04-06T13:30:39.430 に答える