objective-c - NSOpenPanel 选择一个目录（不是文件）

Question

我想让用户选择一个目录来保存文件。但是如何确保 url 是目录而不是文件？

NSOpenPanel* panel = [NSOpenPanel openPanel];
[panel setCanChooseDirectories:YES];
[panel setCanCreateDirectories:YES];

[panel beginSheetModalForWindow:self.window completionHandler:^(NSInteger result){
    if (result == NSFileHandlingPanelOKButton) {
        NSArray* urls = [panel URLs];
        for (NSURL *url in urls) {
            //here how to judge the url is a directory or a file
        }
    }
}];

Answer 1

为将来阅读此内容的任何人更新：

在 Swift 中，可以通过使用来避免检查选择的路径是否为文件

panel.canChooseFiles = false

Answer 2

// First, check if the URL is a file URL, as opposed to a web address, etc.
if (url.isFileURL) {
  BOOL isDir = NO;
  // Verify that the file exists 
  // and is indeed a directory (isDirectory is an out parameter)
  if ([[NSFileManager defaultManager] fileExistsAtPath: url.path isDirectory: &isDir]
      && isDir) {
    // Here you can be certain the url exists and is a directory
  }
}

Answer 3

斯威夫特 4版本：

if (url.isFileURL) {
    var isDir: ObjCBool = false
    if (FileManager.default.fileExists(atPath: url.path, isDirectory: &isDir)) { 
       if isDir.boolValue {
                            print("It's a Directory path")
                          } else {
                            print("It's a file path")
                        }
                    }
}