initWithPasteboardPropertyList from Objc to swift

I have the following code in a tutorial :

@implementation DesktopEntity
- (id)initWithFileURL:(NSURL *)fileURL {
    self = [super init];
    if (self) {
        _fileURL = fileURL;
    }
    return self;
}
+ (DesktopEntity *)entityForURL:(NSURL *)url {
    NSString *typeIdentifier;
    if ([url getResourceValue:&typeIdentifier forKey:NSURLTypeIdentifierKey error:NULL]) {
        NSArray *imgTypes = [NSImage imageTypes];
        if ([imgTypes containsObject:typeIdentifier]) {
            return [[DesktopImageEntity alloc] initWithFileURL:url];
        } else if ([typeIdentifier isEqualToString:(NSString *)kUTTypeFolder]) {
            return [[DesktopFolderEntity alloc] initWithFileURL:url];
        }
    }
    return nil;
}

- (id)initWithPasteboardPropertyList:(id)propertyList ofType:(NSString *)type {
    NSURL *url = [[NSURL alloc] initWithPasteboardPropertyList:propertyList ofType:type];
    self = [DesktopEntity entityForURL:url];
    return self;
}

, I am not sure how to convert to swift the initWithPasteboardPropertyList

If I call the class function DesktopEntity entityForURL:url, to which object should I assign its result ? Obviously I cannot write

self = DesktopEntity.entityForURL(url!)

here is what I wrote so far

class DesktopEntity: NSObject, NSPasteboardWriting, NSPasteboardReading {
  
    var fileUrl : NSURL
    private var _name : String /
    init(fileURL: NSURL) {
        self.fileUrl = fileURL
        _name = ""
        super.init()
    }
  
    class func entityForURL(url: NSURL) -> DesktopEntity? {
        var typeIdentifier: AnyObject?  /
        do {
            try url.getResourceValue(&typeIdentifier, forKey: NSURLTypeIdentifierKey) /
            let imgTypes = NSImage.imageTypes()
          
            let stringTypeIdentifier = typeIdentifier as! String
            if imgTypes.contains(stringTypeIdentifier) {
                return DesktopImageEntity(fileURL: url)
            } else if stringTypeIdentifier == kUTTypeFolder as String {
                return DesktopFolderEntity(fileURL: url)
            }
        } catch _ {}
      
    return nil /
    }
    var name : String? {
        get {
            var localName: AnyObject?
            do {
                try fileUrl.getResourceValue(&localName, forKey: NSURLLocalizedNameKey)
                    return localName as? String
                } catch _ {  }
            return _name /
        }
        set {
            _name = newValue!
        }
    }

    required init!(pasteboardPropertyList propertyList: AnyObject, ofType type: String) {       
        let url = NSURL(pasteboardPropertyList: propertyList, ofType: type)
                                           // How to implement : DesktopEntity.entityForURL(url!)
        self.fileUrl = url!
        _name = ""
        super.init()
    }