NSFileManager列出目录内容，不包括目录 [英] NSFileManager list directory contents excluding directories

问题描述

有没有办法告诉 - [NSFileManager contentsOfDirectoryAtURL：includePropertiesForKeys：options：error：] 方法在收集目录的内容时排除目录名称？ p>

我有一个树视图显示文件夹，并希望在表视图中显示ONLY文件，但我似乎找不到一个键或任何其他方式来排除文件夹。我想我可以迭代返回的数组只填充文件到第二个数组，将用作数据源，但这种双重处理似乎有点狡猾。

我也尝试从 tableView：viewForTableColumn：row：返回 nil c $ c>方法如果 NSURL 是一个目录，但是只会导致表中的一个空行，所以这也不好。

当然有一种方法可以告诉 NSFileManager 我只想要文件？

解决方案

使用目录枚举可以更深入一些。

这是怎么回事？

  NSDirectoryEnumerator * dirEnumerator = [localFileManager enumeratorAtURL ：directoryToScan includePropertiesForKeys：[NSArray arrayWithObjects：NSURLNameKey，NSURLIsDirectoryKey，nil] options：NSDirectoryEnumerationSkipsSubdirectoryDe​​scendants errorHandler：nil]; 
 NSMutableArray * theArray = [NSMutableArray array]; 
 
（NSURL * theURL in dirEnumerator）{
 
 //检索文件名。从NSURLNameKey，在枚举期间缓存。 
 NSString * fileName; 
 [theURL getResourceValue：& fileName forKey：NSURLNameKey error：NULL]; 
 
 //检索目录。从NSURLIsDirectoryKey，
 //在枚举期间缓存。 
 
 NSNumber * isDirectory; 
 [theURL getResourceValue：& isDirectory forKey：NSURLIsDirectoryKey error：NULL]; 
 
 
 if（[isDirectory boolValue] == NO）
 {
 [theArray addObject：fileName]; 
} 
} 
 
 //此处的Array包含所有文件名
  

Is there a way to tell the -[NSFileManager contentsOfDirectoryAtURL:includingPropertiesForKeys:options:error:] method to exclude directory names when gathering the contents of a directory?

I have a tree view showing folders and want to show ONLY files in the table view, but I can't seem to find a key or any other way to exclude folders. I suppose I could iterate the returned array to stuff only files into a second array, which will be used as the data source, but this double-handling seems a bit dodgy.

I also tried returning nil from the tableView:viewForTableColumn:row: method if the NSURL was a directory, but that only results in a blank row in the table, so that's no good either.

Surely there is a way to just tell NSFileManager that I only want files?

解决方案

You can go a little deeper with a directory enumerator.

How about this?

NSDirectoryEnumerator *dirEnumerator = [localFileManager enumeratorAtURL:directoryToScan includingPropertiesForKeys:[NSArray arrayWithObjects:NSURLNameKey, NSURLIsDirectoryKey,nil] options:NSDirectoryEnumerationSkipsSubdirectoryDescendants  errorHandler:nil];
NSMutableArray *theArray=[NSMutableArray array];

for (NSURL *theURL in dirEnumerator) {

    // Retrieve the file name. From NSURLNameKey, cached during the enumeration.
    NSString *fileName;
    [theURL getResourceValue:&fileName forKey:NSURLNameKey error:NULL];

    // Retrieve whether a directory. From NSURLIsDirectoryKey, also
    // cached during the enumeration.

    NSNumber *isDirectory;
    [theURL getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:NULL];


    if([isDirectory boolValue] == NO)
    {
        [theArray addObject: fileName];
    }
}

// theArray at this point contains all the filenames

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