在Objective-C中的指定路径获取具有特定扩展名的文件列表 [英] Get list of files with specific extensions at a specified path in Objective-C

问题描述

我对Objective-C很新。我正在开发一个Cocoa应用程序。
目前我在Objective C中寻找这个C＃代码：

  string [] fileList = Directory .GetFiles（DownloadPath，* .jpg）; 
  

返回的字符串不一定是完整路径，因为我需要的是文件名。我试过NSFileManager，但到目前为止没有好的。谢谢。

编辑：我尝试过的NSFileManager：

  [someFileManager contentsOfDirectoryAtPath：path error：nil]; 
  

我还想问：'path'的格式是什么？这听起来很容易，但我完全没有MAC OS文件系统。我使用的路径是从[NSOpenPanel URL]，它们看起来像这样：

  file：// localhost /有时我得到结果，但有一些其他时间返回的NSArray只是一个简单的例子。空。我很困惑这一切，所以任何帮助将不胜感激。 
 
 
 
 EDIT2：
这里的答案： NSPredicate结束多个文件，可能是一个更好的选择。 
解决方案
此代码应该可以运行：
  NSArray * dirFiles = [[NSFileManager defaultManager] contentOfDirectoryAtPath：path error：nil]; 
 NSArray * jpgFiles = [dirFiles filteredArrayUsingPredicate：[NSPredicate predicateWithFormat：@self ENDSWITH'.jpg']]; 
  
 
I'm pretty new to Objective-C. I'm developing a Cocoa application.
Currently I'm looking for the equivalent of this C# code in Objective C:
string[] fileList = Directory.GetFiles(DownloadPath, "*.jpg");
The returned strings need not necessarily be full path, since all I need is the file names. I have tried NSFileManager but so far no good yet. Thank you.

EDIT: What I've tried with NSFileManager:
[someFileManager contentsOfDirectoryAtPath:path error:nil];
I also want to ask: what is the format of 'path'? This sounds easy, but I'm completely clueless about MAC OS file system. The path that I'm using is from [NSOpenPanel URLs], and they looks like this:
file://localhost/Users/alex/Movies/
Sometimes I get the results, but some other time The returned NSArray is just empty. I'm pretty confused about this so any help would be appreciated. 

EDIT2:
The answer here: NSPredicate endswith multiple files, is probably a better choice. Nevertheless, thank you for your answer.
解决方案
This code should work:
NSArray *dirFiles = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
NSArray *jpgFiles = [dirFiles filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self ENDSWITH '.jpg'"]];


                        
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