在iPad上更新应用程序崩溃

这很有趣。 我有一个通用的应用程序。 iPhone和iPad版本都共享相同的类，只是有不同的xib文件。 我经常收到更新iPad版本的报告，它不会运行，只是崩溃。 不过，iPhone版本的更新工作得很好。 删除iPad应用程序，重新启动和重新安装将解决启动时的崩溃问题。

更新与受影响的代码：

好吧，所以在resymbolicating和查看受影响的代码行后，这里是我觉得所有的领域造成的问题。

我希望应用程序第一次提出问题，并且只在第一次运行应用程序时，所以在AppDelegate didFinishLaunchingWithOptions中我有：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if (! [defaults boolForKey:@"notFirstRun"]) { UIAlertView *firstrun = [[UIAlertView alloc] initWithTitle:@"Sermon Preference" message:@"Do you prefer audio only, or video sermons? (This setting can be changed at any time in the Settings Page.)" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Audio", @"Video", nil]; [firstrun show]; [firstrun release]; [defaults setBool:YES forKey:@"notFirstRun"]; } 

然后我在AppDelegate仍然有：

 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == 0) { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString *nope = @"Audio"; [defaults setObject:nope forKey:@"videosermons"]; [defaults synchronize]; } if (buttonIndex == 1) { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString *yup = @"Video"; [defaults setObject:yup forKey:@"videosermons"]; [defaults synchronize]; } } 

我想要在设置窗口中更改这些值，所以在Settings类中我有：

 - (void)viewDidLoad { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString *currently = [defaults objectForKey:@"videosermons"]; if ([currently isEqualToString:@"Audio"]) { segment.selectedSegmentIndex = 0; } if ([currently isEqualToString:@"Video"]) { segment.selectedSegmentIndex = 1; } NSString *firstName = [defaults objectForKey:@"firstName"]; if (firstName == nil) { } else { myTextField.text = firstName; } NSURL *url = [NSURL URLWithString:@"http://www.bellavenue.org/worship.html"]; self.content = [NSString stringWithContentsOfURL:url]; [super viewDidLoad]; } 

崩溃日志说造成崩溃的行是：

  if ([currently isEqualToString:@"Audio"]) { 

究竟是什么原因导致了iPad上的崩溃，只有在更新已经安装的以前的版本，而不是新的安装？

更新崩溃日志：

 Incident Identifier: EE5B1A62-12DB-4ED5-95CD-0C68CE1614BA CrashReporter Key: 92fbea1d35e30ff292ba7362f93548dceedefe66 Hardware Model: iPad2,5 Process: Bell Avenue [1013] Path: /var/mobile/Applications/CE1AE921-5767-4B3C-B223-2C098041C73E/Bell Avenue.app/Bell Avenue Identifier: Bell Avenue Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2012-12-01 14:11:10.653 -0600 OS Version: iOS 6.1 (10B5105c) Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 0 Last Exception Backtrace: 0 CoreFoundation 0x3411529e 0x34053000 + 795294 1 libobjc.A.dylib 0x33f3297a 0x33f2a000 + 35194 2 CoreFoundation 0x34118e02 0x34053000 + 810498 3 CoreFoundation 0x3411752c 0x34053000 + 804140 4 CoreFoundation 0x3406ef64 0x34053000 + 114532 5 Bell Avenue 0x0008652e -[Settings viewDidLoad] (Settings.m:64) 6 UIKit 0x3396578c 0x337c5000 + 1705868 7 UIKit 0x3396d5fa 0x337c5000 + 1738234 8 UIKit 0x3399786a 0x337c5000 + 1910890 9 UIKit 0x33820ae4 0x337c5000 + 375524 10 UIKit 0x337c8f7c 0x337c5000 + 16252 11 UIKit 0x337c8a10 0x337c5000 + 14864 12 UIKit 0x337c845e 0x337c5000 + 13406 13 GraphicsServices 0x3afaf59e 0x3afa9000 + 26014 14 GraphicsServices 0x3afaf1ce 0x3afa9000 + 25038 15 CoreFoundation 0x340ea16e 0x34053000 + 618862 16 CoreFoundation 0x340ea112 0x34053000 + 618770 17 CoreFoundation 0x340e8f94 0x34053000 + 614292 18 CoreFoundation 0x3405beb8 0x34053000 + 36536 19 CoreFoundation 0x3405bd44 0x34053000 + 36164 20 UIKit 0x3381f7c8 0x337c5000 + 370632 21 UIKit 0x3381c644 0x337c5000 + 357956 22 Bell Avenue 0x000832fe main (main.m:13) 23 libdyld.dylib 0x39d7ab1c 0x39d79000 + 6940 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x385b6350 0x385a5000 + 70480 1 libsystem_c.dylib 0x3a64d11e 0x3a61e000 + 192798 2 libsystem_c.dylib 0x3a68996e 0x3a61e000 + 440686 3 libc++abi.dylib 0x33e1cd4a 0x33e19000 + 15690 4 libc++abi.dylib 0x33e19ff4 0x33e19000 + 4084 5 libobjc.A.dylib 0x33f32a74 0x33f2a000 + 35444 6 libc++abi.dylib 0x33e1a078 0x33e19000 + 4216 7 libc++abi.dylib 0x33e1a110 0x33e19000 + 4368 8 libc++abi.dylib 0x33e1b594 0x33e19000 + 9620 9 libobjc.A.dylib 0x33f329cc 0x33f2a000 + 35276 10 CoreFoundation 0x3405bf1c 0x34053000 + 36636 11 CoreFoundation 0x3405bd44 0x34053000 + 36164 12 UIKit 0x3381f7c8 0x337c5000 + 370632 13 UIKit 0x3381c644 0x337c5000 + 357956 14 Bell Avenue 0x000832fe main (main.m:13) 15 libdyld.dylib 0x39d7ab1c 0x39d79000 + 6940 Thread 1: 0 libsystem_kernel.dylib 0x385b6d98 0x385a5000 + 73112 1 libsystem_c.dylib 0x3a624cf6 0x3a61e000 + 27894 2 libsystem_c.dylib 0x3a624a12 0x3a61e000 + 27154 3 libsystem_c.dylib 0x3a6248a0 0x3a61e000 + 26784 Thread 2 name: Dispatch queue: com.apple.libdispatch-manager Thread 2: 0 libsystem_kernel.dylib 0x385a6648 0x385a5000 + 5704 1 libdispatch.dylib 0x3aee2974 0x3aeda000 + 35188 2 libdispatch.dylib 0x3aee2654 0x3aeda000 + 34388 Thread 3: 0 libsystem_kernel.dylib 0x385b6d98 0x385a5000 + 73112 1 libsystem_c.dylib 0x3a624cf6 0x3a61e000 + 27894 2 libsystem_c.dylib 0x3a624a12 0x3a61e000 + 27154 3 libsystem_c.dylib 0x3a6248a0 0x3a61e000 + 26784 Thread 4 name: WebThread Thread 4: 0 libsystem_kernel.dylib 0x385b60fc 0x385a5000 + 69884 1 libsystem_c.dylib 0x3a61f124 0x3a61e000 + 4388 2 WebCore 0x38db41c0 0x38da8000 + 49600 3 WebCore 0x38db40f2 0x38da8000 + 49394 4 CoreFoundation 0x340ea6ca 0x34053000 + 620234 5 CoreFoundation 0x340e89bc 0x34053000 + 612796 6 CoreFoundation 0x340e8de8 0x34053000 + 613864 7 CoreFoundation 0x3405beb8 0x34053000 + 36536 8 CoreFoundation 0x3405bd44 0x34053000 + 36164 9 WebCore 0x38db22a8 0x38da8000 + 41640 10 libsystem_c.dylib 0x3a62f30e 0x3a61e000 + 70414 11 libsystem_c.dylib 0x3a62f1d4 0x3a61e000 + 70100 

Answer 1

系统导致应用程序中止（ SIGABRT ）。 代码中有几个问题：

1. viewDidLoad所有代码应该在viewWillAppear:实际执行viewWillAppear: 。 当iOS加载视图时，没有任何代码可以执行。
2. self.content = [NSString stringWithContentsOfURL:url]是一个同步调用，阻塞主线程的时间长度。 你应该或者asynchronous调用它，或者使用一个NSOperationQueue来加载内容，然后再把它设置在主线程上。 现在这阻止了视图控制器的加载过程，这是一个更糟糕的想法。
3. exception消息没有显示，但我怀疑你currently对象是不是NSStringtypes，它得到一个unrecognized selector sent to instance错误。

您可能想要阅读关于如何阅读和处理崩溃报告的系列文章： http : //www.raywenderlich.com/10209/my-app-crashed-now-what-part-1