问题标签 [nsrangeexception]

I am using this code to get the latest photo from the cameraRoll:

As it is, if the library cameraRoll is empty, the app will crash with this error:

I understand that my indexSet is higher than the numberOfAssets due to this:

At this point my question is "where do I put a condition that allow me to check if the assets is zero?"

If cameraRoll has more than zero, I will let the code continue, but if the count is zero, I would like to handle the issue this way as oppose to let it crash:

Thanks for your help!

主程序

调试器说错误在“NSStringFromClass”行。我不知道这是什么意思或是什么，请帮助我！：/

在我最新的 iOS 应用更新中，我发现与数据库相关的崩溃显着增加。我看到几乎每一行在数据库上运行提取的代码都会崩溃。

例外： NSRangeException
* -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array

堆栈跟踪：

CoreFoundation 0x32c982a3 __exceptionPreprocess + 163 1
libobjc.A.dylib 0x3a93d97f objc_exception_throw + 31 2
CoreFoundation 0x32be3b75 -[__NSArrayM objectAtIndex:] + 165 3
CoreData 0x32a4227f -[NSSQLCore _newRowsForFetchPlan:selectedBy:withArgument:] + 2007 4
CoreData 0x32a3b089 -[NSSQLCore newRowsForFetchPlan:] + 313 5
CoreData 0x32a3a73f -[NSSQLCore objectsForFetchRequest:inContext:] + 683 6
CoreData 0x32a3a205 -[NSSQLCore executeRequest:withContext:error:] + 469 7
CoreData 0x32a3961d -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1645 8
CoreData 0x32a37f17 -[NSManagedObjectContext executeFetchRequest:error:] + 647 9
MyApp 0x000516b7 +[DBQuery searchObjectsWithEntityName:::::] + 211 10
MyApp 0x000515a1 +[DBQuery syncData] + 113 11
MyApp 0x0006a7f7 __14+[MyAppSync sync]_block_invoke + 39 12
libdispatch.dylib 0x3ad5511f _dispatch_call_block_and_release + 11 13
libdispatch.dylib 0x3ad63259 _dispatch_root_queue_drain + 261 14
libdispatch.dylib 0x3ad633b9 _dispatch_worker_thread2 + 85 15
libsystem_c.dylib 0x3ad89a11 _pthread_wqthread + 361 16
libsystem_c.dylib 0x3ad898a4 start_wqthread + 8

看起来罪魁祸首的代码行可能与添加我的 NSFetchRequest 的两行修改有关：

+ (NSFetchRequest*) getFetchRequestForEntityName:(NSString*)entityName :(NSPredicate*)predicate :(NSString*)sortKey :(BOOL)sortAscending :(int)limit :(NSManagedObjectContext*)managedObjectContext { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:managedObjectContext]; [request setEntity:entity];

}

我有奇怪的问题。以下子字符串代码崩溃

我假设范围在边界内，但它仍然崩溃。知道为什么会这样吗？以下是它显示的错误。

* Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFConstantString substringWithRange:]: Range or index out of bounds' * First throw call stack: (0x1c92012 0x10cfe7e 0x1c91deb 0x1c6aaa4 0x2bbc 0xf51c7 0xf5232 0x443d5 0x4476f 0x44905 0x4d917 0x27c5 0x11157 0x11747 0x1294b 0x23cb5 0x24beb 0x16698 0x1beddf9 0x1bedad0 0x1c07bf5 0x1c07962 0x1c38bb6 0x1c37f44 0x1c37e1b 0x1217a 0x13ffc 0x24fd 0x2425）抛出异常（将终止调用）

I have a for loop.

I understand from the documentation that characterAtIndex: will usually return a value of the type 'unichar' but if our index is out of bounds an NSRangeException is returned.

Being cautious, I'd like to check whether [string characterAtIndex:i] is returning an NSRangeException or not before assigning to return value to currentCharacter.

The first thing I tried was this:

...but it doesn't work because, from my understanding, the method usually returns an int and I'm comparing it to NSRangeException, which is a string.

I thought about [string characterAtIndex:i] isKindOfClass:...] but that won't work because [string characterAtIndex:i] is not an NSObject. So, uh, how do I test for the exception?

Should I be testing for the exception? How do I test for the type of the returned value if it's sometimes a primitive and sometimes an NSObject?

我正在编写 iOS 应用程序中的搜索栏逻辑。我有 1 个 NSArray “results”，其中包含从 NSFetchRequest 返回的实体，以及一个空的 NSMutableArray “resultados”，我想在其中添加从第一个数组返回的对象。

这是代码：

每次执行此行时：

我得到以下异常：

我不明白如何使用 addObjectsFromArray 方法超越任何数组边界。事实上，如果我将这条指令替换为以下基本上相同的调试代码，我可以看到我正在添加所有对象，但在添加最后一个对象时总是抛出异常，无论结果返回多少对象：

我尝试了很多变化，但我不知道发生了什么。

在此先感谢您的帮助。

第一次崩溃是由调用 removeAllObjects 引起的，第二次是 addObject：

和

我写了一个代码来替换删除NSString中的子字符串......我的逻辑是使用'rangeofString'来查找每个子字符串字符的位置，然后使用'ReplaceOccurance'用空格替换子字符串字符，然后修剪空白字符. 但是在 replaceOccurance 行中出现错误

这是我的代码。

实际上我解决了范围的问题..因为重写代码我误认为 seocond 参数不是上限而是长度..应该如下

我正在设置标签的属性文本，我收到了这个奇怪的错误：由于未捕获的异常“NSRangeException”而终止应用程序，原因：“NSMutableRLEArray replaceObjectsInRange:withObject:length:: Out of bounds”。我以前从未见过这个错误，所以我不知道如何解决它。这是导致崩溃的代码：

我设置了一个异常断点，它在线上崩溃了[attributedString setAttributes:attrs range:nameRange];有谁知道我该如何解决这个问题？

以上是我的脚本。我的脚本有问题，我找不到解决方案。