使用嵌套文件夹迭代文件夹中的文件 - Cocoa

Question

我需要访问文件夹中的每个文件,包括嵌套文件夹中存在的文件.示例文件夹可能如下所示.

animals/
 -k.txt
 -d.jpg
 cat/
   -r.txt
   -z.jpg
   tiger/
      -a.jpg
      -p.pdf
 dog/
   -n.txt
   -f.jpg
 -p.pdf

假设我想在不是文件夹的"动物"中的每个文件上运行一个进程.迭代文件夹"animals"及其所有子文件夹访问每个文件的最佳方法是什么？

谢谢.

Answer 1

使用NSDirectoryEnumerator递归枚举你想要的目录下的文件和目录,并要求它要告诉你它是否是一个文件或目录.以下内容基于以下文档中列出的示例-[NSFileManager enumeratorAtURL:includingPropertiesForKeys:options:errorHandler:]:

NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *directoryURL = … // URL pointing to the directory you want to browse
NSArray *keys = [NSArray arrayWithObject:NSURLIsDirectoryKey];

NSDirectoryEnumerator *enumerator = [fileManager
    enumeratorAtURL:directoryURL
    includingPropertiesForKeys:keys
    options:0
    errorHandler:^(NSURL *url, NSError *error) {
        // Handle the error.
        // Return YES if the enumeration should continue after the error.
        return YES;
}];

for (NSURL *url in enumerator) { 
    NSError *error;
    NSNumber *isDirectory = nil;
    if (! [url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {
        // handle error
    }
    else if (! [isDirectory boolValue]) {
        // No error and it’s not a directory; do something with the file
    }
}

Answer 2

也许你可以使用这样的东西:

+(void)openEachFileAt:(NSString*)path
{
  NSDirectoryEnumerator* enumerator = [[NSFileManager defaultManager] enumeratorAtPath:path];
  for (NSString * file in enumerator)
  {
     // check if it's a directory
     BOOL isDirectory = NO;
    NSString* fullPath = [path stringByAppendingPathComponent:file];
    [[NSFileManager defaultManager] fileExistsAtPath:fullPath
                                         isDirectory: &isDirectory];
    if (!isDirectory)
    {
      // open your file (fullPath)…
    }
    else
    {
      [self openEachFileAt: fullPath];
    }
  }
}

Answer 3

这是一个快速版本:

func openEachFile(inDirectory path: String) {
    let subs = try! FileManager.default.subpathsOfDirectory(atPath: path)
    let totalFiles = subs.count
    print(totalFiles)
    for sub in subs {
        if sub.hasPrefix(".DS_Store") {
            //a DS_Store file
        }
        else if sub.hasSuffix(".xcassets") {
            //a xcassets file
        }
        else if (sub as NSString).substring(to: 4) == ".git" {
            //a git file
        }
        else if sub.hasSuffix(".swift") {
            //a swift file
        }
        else if sub.hasSuffix(".m") {
            //a objc file
        }
        else if sub.hasSuffix(".h") {
            //a header file
        }
        else {
            // some other file
        }
        let fullPath = (path as NSString).appendingPathComponent(sub)
    }
}