CoreData应用程序目录在iOS3上崩溃 [英] CoreData application directory crashes on iOS3

问题描述

我已经完成了我的应用程序，在iOS4上运行良好，但是当它加载到3.2模拟器它崩溃与..

  2010-12-21 07：54：32.052 App [14044：207] ***  -  [NSPathStore2 URLByAppendingPathComponent：]：无法识别的选择器发送到实例0x4d2b640 
 2010-12-21 07：54：32.054 App [ 14044：207] ***由于未捕获异常NSInvalidArgumentException终止应用程序，原因：'***  -  [NSPathStore2 URLByAppendingPathComponent：]：无法识别的选择器发送到实例0x4d2b640'
  pre> 
 
 
我得到应用程序文档目录
  NSURL * storeURL = [[self applicationDocumentsDirectory] ​​URLByAppendingPathComponent：@App.sqlite]; 
 
  - （NSURL *）applicationDocumentsDirectory {
 return [[[NSFileManager defaultManager] URLsForDirectory：NSDocumentDirectory inDomains：NSUserDomainMask] lastObject]; 
} 
  
任何帮助都会很棒，谢谢。
解决方案
 文档提到 URLByAppendingPathComponent：仅在iOS 4及更高版本中可用。您可以通过使用 NSStrings 与 stringByAppendingPathComponent：，然后在完成后转换为网址。
 
 
 
显然 URLsForDirectory：inDomains：也只有4.0。查看 NSSearchPathsForDirectoriesInDomains（），以便与以前的操作系统兼容。
 
I have nearly finished my application that works well on iOS4, however when loading it into the 3.2 simulator it crashes with..
2010-12-21 07:54:32.052 App[14044:207] *** -[NSPathStore2 URLByAppendingPathComponent:]: unrecognized selector sent to instance 0x4d2b640
2010-12-21 07:54:32.054 App[14044:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSPathStore2 URLByAppendingPathComponent:]: unrecognized selector sent to instance 0x4d2b640'
I am getting the application Document Directory with
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"App.sqlite"];

- (NSURL *)applicationDocumentsDirectory {
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
Any help would be great, thanks.
解决方案
The documentation mentions that URLByAppendingPathComponent: is only available in iOS 4 and later. You can accomplish the same thing by using NSStrings with stringByAppendingPathComponent:, and then converting to a URL when done.

Apparently URLsForDirectory:inDomains: is 4.0-only as well. Check out NSSearchPathsForDirectoriesInDomains() for an alternative that's compatible with earlier OSes.

                        
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