XCode：异常。如何检测原因？

本文介绍了XCode：异常。如何检测原因？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 使用iOS 6.1的Xcode 4.6.1。我正在使用与StackMob的远程数据库。应用程序首先发出错误，并且在单击播放几次后，它运行正常，并与服务器进行通信。不知道如何检测问题，应该怎么关心？ 我有以下异常断点设置： 应用程序运行，然后停止在以下行： NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription * entity = [NSEntityDescription entityForName：@UserinManagedObjectContext：self.managedObjectContext]; [fetchRequest setEntity：entity]; NSPredicate * predicate = [NSPredicate predicateWithFormat：@email ==％@，self.emailAddressField.text]; [fetchRequest setPredicate：predicate]; NSError * error = nil; NSArray * fetchedObjects = [[self managedObjectContext] executeFetchRequest：fetchRequest error：& error]; 所以我将上面的行改为： NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription * entity = [NSEntityDescription entityForName：@UserinManagedObjectContext：self.managedObjectContext]; [fetchRequest setEntity：entity]; NSPredicate * predicate = [NSPredicate predicateWithFormat：@username ==％@，self.usernameField.text]; [fetchRequest setPredicate：predicate]; [managedObjectContext executeFetchRequest：fetchRequest onSuccess：^（NSArray * fetchedObjects） { 现在，当我运行程序，我得到以下错误： 与 所以我点击播放按钮 我收到以下错误： 之后，再次单击播放一次，应用程序继续运行，好像没有发生任何事情？我应该担心吗解决方案一旦调试器停止异常，您可以使用简单的lldb命令检查异常。在这里选择你的线程6中的异常： 然后，如果您正在运行模拟器类型： code> po $ eax 如果您正在设备上运行： po $ r0（32位） po $ x0（64位） 您应该了解该例外情况。 Xcode 4.6.1 with iOS 6.1. I'm using remote database with StackMob. Application first gives an error and after I click Play a few times, it runs fine and communicates with the server just fine. Not sure how to detect the problem and should it a concern? I have the following exception Break Point setup:The application runs and then stops at the following line: NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedObjectContext]; [fetchRequest setEntity:entity]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"email == %@", self.emailAddressField.text]; [fetchRequest setPredicate:predicate]; NSError *error = nil; NSArray *fetchedObjects = [[self managedObjectContext] executeFetchRequest:fetchRequest error:&error];so I changed the line above to:NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedObjectContext]; [fetchRequest setEntity:entity]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"username == %@", self.usernameField.text]; [fetchRequest setPredicate:predicate]; [managedObjectContext executeFetchRequest:fetchRequest onSuccess:^(NSArray *fetchedObjects) {Now when I run the program, I get the following error:withso I click the play button and I get the following error:and after I click play one more time, the Application continues to run as if nothing happened? Should I be concerned? 解决方案 You can check what the exception is with a simple lldb command, once the debugger stops on the exception. Select the exception like in your thread 6 here:And then if you are running on the simulator type: po $eaxIf you are running on the device:po $r0 (for 32-bit)po $x0 (for 64-bit)You should get a description of the exception. 这篇关于XCode：异常。如何检测原因？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！