导致奇怪崩溃的方法

Question

我正在构建这个应用程序，但遇到了一些以前从未见过的问题。

1. 当我运行下面的方法时，该应用程序崩溃，该方法连接到 UIButton 作为触发器。因此，当我按下按钮时，它会进行打印，然后模拟器就会崩溃到跳板上。如果我从跳板再次启动应用程序，它不会到达打印方法，如果我从 Xcode 重建它，它会到达，然后像以前一样立即崩溃。

2. 通常调试控制台中有一些信息，我至少可以得到关于正在发生的事情的线索，但似乎没有太多信息。我注意到的一件事是，有一些关于辅助功能被打开的信息，或者当应用程序最初在模拟器中启动时的一些信息，我不记得它是否始终存在：

2010-02-18 10:35:19.024 现金[497:207] ****** 辅助功能状态已更改：于 2010-02-18 10:35:19.134 现金[497:207] ********** 加载 AX 对于：com.yourcompany.Cash ************

版权所有 2010 尼古拉斯·伊安诺 (Nicholas Iannone)：

-(IBAction) logTransaction {

NSIndexPath *indexPath = [[NSIndexPath alloc] init];
indexPath = [self.categoryTableView indexPathForSelectedRow];

NSInteger selectedCategory = indexPath.row;
[indexPath release];
NSString *categoryString = [[NSString alloc] init];
categoryString = [self.categoryArray objectAtIndex:selectedCategory];
CLLocationManager *locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = 1000.0f;
[locationManager startUpdatingLocation];
double x = 10.0;
double y = 10.0;
NSString *descriptionString = [[NSString alloc] init];

descriptionString = descriptionField.text;
//[locationManager stopUpdatingLocation];

Transaction *newTransaction = [[Transaction alloc] initWithAmount:    [self.amountField.text integerValue] 
                                                      description: descriptionString 
                                                         category: categoryString   
                                                        locationX: x 
                                                        locationY: y];

                                      [categoryString release];
[newTransaction print];

 //log transaction here...

[newTransaction release];

这是控制台输出：

2010年2月18日 10:35:19 AM 现金[497] ********** 加载 AX 对于：com.yourcompany.Cash ************ 2010年2月18日 10:35:28 AM现金[497] 0.000000,sddssd,零食,2010-02-18 10:35:28 -0800,10.000000,10.000000 2010年2月18日 10:35:28 AM com.apple.launchd.peruser.501[91]（UIKitApplication：com.yourcompany.Cash[0x9148][497]） 作业似乎崩溃了： 分段错误 2/18/10 10:35:28 AM SpringBoard[482] 应用程序“现金” 异常退出并显示信号 11： 分段错误 2/18/10 10:35:28 AM ReportCrash[491] 已保存的崩溃报告 现金[497]版本？？？ （？？？） 到 /Users/knyck2/Library/Logs/DiagnosticReports/Cash_2010-02-18-103528_Nicholas-Iannones-MacBook-Pro.crash

这是崩溃日志：

流程：现金 [497] 路径：
/用户/knyck2/库/应用程序 支持/iPhone 模拟器/3.2/应用程序/F54FA00C-9E77-4B9A-8774-2D5B5488A1BA/Cash.app/Cash 标识符：现金版本：
??? (???) 代码类型：X86 （本机）父进程：launchd [91]

日期/时间：2010-02-18 10:35:28.631 -0800 操作系统版本：
Mac OS X 10.6.2 (10C540) 报告 版本：6

异常类型：EXC_BAD_ACCESS (SIGSEGV) 异常代码： KERN_INVALID_ADDRESS 位于 0x0000000014600478 崩溃的线程：0 调度队列：com.apple.main-thread

应用程序特定信息： objc_msgSend() 选择器名称：release iPhone 模拟器 3.2 (193)，iPhone 操作系统 3.2（7B298克）

线程 0 崩溃：调度队列： com.apple.main-thread 0
libobjc.A.dylib
0x9805aedb objc_msgSend + 27 1
UIKit
0x002b4a19 _UIApplicationHandleEvent + 8468 2 图形服务 0x02f1f2a8 PurpleEventCallback + 1576 3 核心基础
0x026bb87e CFRunLoopRunSpecific + 4094 4 核心基础
0x026ba878 CFRunLoopRunIn模式 + 88 5 图形服务
0x02f1da4d GSEventRunModal + 217 6
图形服务
0x02f1db12 GSEventRun + 115 7 UIKit 0x002b265d UIApplicationMain + 1134 8 现金
0x00002648 主 + 102 (主.m:13) 9
现金
0x000025b6开始+54

线程 1: 0 libSystem.B.dylib
0x937b88da mach_msg_trap + 10 1
libSystem.B.dylib
0x937b9047 mach_msg + 68 2
核心基础
0x026bb022 CFRunLoopRunSpecific + 1954 3 核心基础
0x026ba878 CFRunLoopRunIn模式 + 88 4 网络核心
0x03151933 RunWebThread（无效*）+ 467 5 libSystem.B.dylib
0x937e5fbd _pthread_start + 345 6
libSystem.B.dylib
0x937e5e42 thread_start + 34

线程 0 在 X86 线程状态下崩溃 （32 位）：eax：0x07802a50 ebx： 0x00017711 ecx: 0x9655d0c4 edx: 0x07833ba2 edi: 0x14600478 esi: 0x00000000 ebp: 0xbfffe158 esp: 0xbfffdfd4 ss: 0x0000001f efl: 0x00010206 eip: 0x9805aedb CS: 0x00000017 ds: 0x0000001f es: 0x0000001f FS: 0x00000000 GS: 0x00000037 cr2：0x14600478

二值图像： 0x1000 - 0x5ff7 +现金??? （？？？） /用户/knyck2/库/应用程序 支持/iPhone 模拟器/3.2/应用程序/F54FA00C-9E77-4B9A-8774-2D5B5488A1BA/Cash.app/Cash 0xd000 - 0xfff7 +PBGDBIntrospectionSupport.A.dylib ??? （？？？） <8C448816-8655-143E-DA39-C8157FDA8C8B> /Developer/Applications/Xcode.app/Contents/PlugIns/GDBMIDebugging.xcplugin/Contents/Resources/PBGDBIntrospectionSupport.A.dylib 0x14000 - 0x1a8ff3 +基金会??? （？？？） <4361202B-C361-85C9-AAD0-3D062EF44941> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Foundation 0x29e000 - 0x2063fe7 +UIKit ??? （？？？） <524597DC-F210-115D-E31D-01A3429E25C7> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/UIKit.framework/UIKit 0x23be000 - 0x25c6fe7 com.apple.CoreGraphics 1.359.16 (？？？) <017CBE03-17D3-25FD-E775-087B415993AA> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics 0x262e000 - 0x2665ff7 +核心位置 ??? （？？？） <80CA49D0-A8EA-0638-A407-0CC131AEEB41> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreLocation.framework/CoreLocation 0x268e000 - 0x2799fff +CoreFoundation ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 0x287d000 - 0x2a15fe7 +libicucore.A.dylib ??? (？？？)<13A09086-26EF-E491-ADD8-9019C31542FC> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libicucore.A.dylib 0x2a76000 - 0x2b75fe7 +libxml2.2.dylib ??? (???)<78BEDCC4-E0FD-1C59-70ED-46FB3D76055C> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libxml2.2.dylib 0x2b9a000 - 0x2c41fe7 +CFNetwork ??? （？？？） <24AFEAF9-230F-C79A-3A2F-BB9F1945CF9A> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x2cc0000 - 0x2cf4ff7 +系统配置??? (???)<5448E217-DB17-F241-AB84-C2FE18372948> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration 0x2d16000 - 0x2d65ff7 +安全??? （？？？） <90BF3878-B2F5-8FD0-4E81-B59E64C47E1D> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Security.framework/Security 0x2d8b000 - 0x2e58fe7 +libsqlite3.dylib ??? (？？？)<3B663A82-D85F-3CD5-130C-FAA6C5ED2D0E> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libsqlite3.dylib 0x2e68000 - 0x2ef3fff com.apple.framework.IOKit 1.5.1 (？？？) /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x2f19000 - 0x2f26ff3 +图形服务??? (???) <7FB2250F-CDD1-D975-0387-6E884CC061CD> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices 0x2f39000 - 0x3071ff7 +JavaScriptCore ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore 0x30c5000 - 0x3888fe7 +WebCore ??? （？？？） <8801B91D-C8BC-51CC-B80A-FB9C67BA8FF2> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x3db5000 - 0x3e4bff7 +WebKit ??? （？？？） <0D579ECA-E22E-7C70-A214-73D2221CD1C7> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/WebKit.framework/WebKit 0x3ec9000 - 0x3f87fe7 +ImageIO ??? （？？？） <524C2CFC-6F77-3B4F-390F-40711BB56980> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/ImageIO.framework/ImageIO 0x3fb2000 - 0x3fd0ff7 +地址簿 ??? （？？？） <2EF304E3-4B16-5B0E-E072-BFABF4B44CF5> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/AddressBook.framework/AddressBook 0x3ff1000 - 0x4145fe7 +音频工具箱 ??? （？？？） <27DC788A-231B-9DB5-0B48-04A2A8D27F32> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox 0x4198000 - 0x425aff7 +QuartzCore ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/QuartzCore.framework/QuartzCore 0x42b5000 - 0x42c2ff7 +SpringBoard服务??? (???)<3CDBCAE3-B6D3-D734-6CB0-AB39EBBE7D57> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices 0x42cd000 - 0x42f9fff +应用程序支持??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/AppSupport.framework/AppSupport 0x4319000 - 0x435cfe7 +CoreText ??? （？？？） <971632EA-E809-8D15-BE25-E115A4FBDFF4> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreText.framework/CoreText 0x438c000 - 0x43c7ff7 +移动核心服务??? (???) <5BFA76AC-EC1B-8D9F-4533-B3DD44041107> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices 0x43e5000 - 0x448efe7 +校对器 ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/ProofReader.framework/ProofReader 0x44ab000 - 0x44b6ff7 +CoreVideo ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/CoreVideo.framework/CoreVideo 0x44c2000 - 0x44d8fe7 +OpenGLES ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/OpenGLES.framework/OpenGLES 0x44e2000 - 0x4558ff3 +CoreAudio ??? （？？？） <14C17E9E-0D13-A7BD-3A06-C3F460FD261C> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreAudio.framework/CoreAudio 0x4594000 - 0x4649fe7 libcrypto.0.9.7.dylib ??? （？？？） <39CDB041-9DF5-01B1-4B33-03EC4CCA40B3> /usr/lib/libcrypto.0.9.7.dylib 0x468f000 - 0x46b5fff libssl.0.9.7.dylib ??? （？？？） <924E1BF8-C24D-4A5C-3DB6-A85034392D19> /usr/lib/libssl.0.9.7.dylib 0x46ea000 - 0x46eaff7 +AccessibilitySettingsLoader ??? (？？？)<21BFF58D-21D2-210F-3150-873A8CC87399> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/AccessibilityBundles/AccessibilitySettingsLoader.bundle/AccessibilitySettingsLoader 0x46ef000 - 0x46f1ff7 +libAccessibility.dylib ??? (???)<9F1CEAA6-2910-7F97-A626-DAA33724ED79> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libAccessibility.dylib 0x7900000 - 0x7909ffb +IAP ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/IAP.framework/IAP 0x7916000 - 0x794cff7 +UIKit ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/AccessibilityBundles/UIKit.axbundle/UIKit 0x7990000 - 0x799bff7 +用户界面辅助功能??? (？？？)<4E2BD72C-F67F-D0DF-78FA-FB1D5840F6B7> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/UIAccessibility.framework/UIAccessibility 0x79ab000 - 0x79baff7 +AXRuntime ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/AXRuntime.framework/AXRuntime 0x79c8000 - 0x7a0afe7 +libCGFreetype.A.dylib ??? (？？？)<8853F0B7-8EE5-AD36-BC97-B0AD8782E547> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib 0x7f31000 - 0x7f57fe7 +libRIP.A.dylib ??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libRIP.A.dylib 0x9cff000 - 0x9d3efe7 +文本输入??? （？？？） /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/TextInput.framework/TextInput 0x9d6a000 - 0x9eafff3 +libmecabra.dylib ??? (？？？)<1C45F15E-3F66-3F28-46C7-78EC4B63C803> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libmecabra.dylib 0x9ee1000 - 0x9ff4ff7 +核心数据??? （？？？） <6F49CC28-8102-D224-EBBD-12045B6DBA92> /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreData.framework/CoreData 0x8fe00000 - 0x8fe4162b dyld 132.1 （？？？） <211AF0DD-42D9-79C8-BB6A-1F4BEEF4B4AB> /usr/lib/dyld 0x91fe7000 - 0x91feafe7 libmathCommon.A.dylib ??? （？？？） <1622A54F-1A98-2CBE-B6A4-2122981A500E> /usr/lib/system/libmathCommon.A.dylib 0x93497000 - 0x93501fe7 libstdc++.6.dylib ??? （？？？） <411D87F4-B7E1-44EB-F201-F8B4F9227213> /usr/lib/libstdc++.6.dylib 0x937b8000 - 0x9395cfeb libSystem.B.dylib ??? （？？？） /usr/lib/libSystem.B.dylib 0x96692000 - 0x966d8ff7 libauto.dylib ??? (???)<85670A64-3B67-8162-D441-D8E0BE15CA94> /usr/lib/libauto.dylib 0x9706e000 - 0x97082fe7 libbsm.0.dylib ??? （？？？） <14CB053A-7C47-96DA-E415-0906BA1B78C9> /usr/lib/libbsm.0.dylib 0x98055000 - 0x98102fe7 libobjc.A.dylib ??? （？？？） /usr/lib/libobjc.A.dylib 0x98103000 - 0x981f7fe7 libiconv.2.dylib ??? （？？？） <0C578460-3929-29DD-585A-DB1E0C977425> /usr/lib/libiconv.2.dylib 0x98fd9000 - 0x98fe7fe7 libz.1.dylib ??? （？？？） <7B7A02AB-DA99-6180-880E-D28E4F9AA8EB> /usr/lib/libz.1.dylib 0xffff0000 - 0xffff1fff libSystem.B.dylib ??? （？？？） /usr/lib/libSystem.B.dylib

Answer 1

这是错误的：

NSIndexPath *indexPath = [[NSIndexPath alloc] init];
indexPath = [self.categoryTableView indexPathForSelectedRow];

NSInteger selectedCategory = indexPath.row;
[indexPath release];

您正在实例化一个空的 NSIndexPath，然后覆盖对它的引用。最后一行的释放被发送到表视图返回的完全不同的对象。您创建的对象永远不会被使用，也永远不会被释放。

这将起作用：

NSIndexPath *indexPath = [self.categoryTableView indexPathForSelectedRow];
NSInteger selectedCategory = indexPath.row;

您没有创建 NSIndexPath 对象，因此您没有责任释放它。

（不必要的释放导致索引路径实例过早释放。当Apple的代码尝试释放该对象时，它不再存在，并且应用程序崩溃）

Answer 2

这只是一个猜测，因为并非所有代码都在那里。在 Transaction 类的 init 方法中，您是否确保保留字符串？ （类别和描述）。

对我来说最突出的是初始化事务，然后立即释放categoryString。如果您不保留该字符串，那么这可能是崩溃的根源。

顺便说一句，你正在泄漏内存。这里：

NSString *descriptionString = [[NSString alloc] init];
descriptionString = descriptionField.text;

descriptionString指向一个新分配的字符串，只是被重新分配给一个现有的字符串，因此第一个字符串被泄漏。您应该将其更改为：

NSString *descriptionString;
descriptionString = descriptionField.text;

或更简单：

NSString *descriptionString = descriptionField.text;