如何获取拖拽的文件路径

如何获取拖拽的文件路径

let files = pboard.readObjects(forClasses: [NSURL.self], options: nil) as! [NSURL]
注意获取到的URL和URL.path的不同之处

class FileDragView: NSView {
    weak var delegate:FileDragDelegate?
    // 注册拖放类型，可以在awakeFromNib中注册
    override func awakeFromNib() {
        super.awakeFromNib()
        // 注册拖放类型
        registerForDraggedTypes([.fileURL])
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.
    }
    
    override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
        let sourceDargMask = sender.draggingSourceOperationMask
        let pboard = sender.draggingPasteboard
        let dragTypes = pboard.types!
        if dragTypes.contains(.fileURL) {
            if sourceDargMask.contains(NSDragOperation.link) {
                return .link
            }
            
            if sourceDargMask.contains(.copy) {
                return .copy
            }
        }
        return .generic
    }
    // 注意此处的打印结果
    override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
        let pboard = sender.draggingPasteboard
        let dragTypes = pboard.types!
        if dragTypes.contains(.fileURL) {
          // 注意使用NSURL而不是URL，因为URL是结构体，在NSURL是class
            let files = pboard.readObjects(forClasses: [NSURL.self], options: nil) as! [NSURL]
            for fileURL in files {
                print("fileURL:\(fileURL)\n,filePath:\(fileURL.path!)")
              // fileURL:file:///.file/id=6571367.1690508
//,filePath:/Users/ekko/Documents/Developer/Documents/程序接入H5说明v1.0.html
            }
            delegate?.didFinishDrag(files[0])
        }
        return true
    }
    
    
}
// 拖拽完成的代理
protocol FileDragDelegate:class {
    func didFinishDrag(_ fileURL:NSURL)
}

// 在控制器中配置代理，处理拖拽后拿到的文件路径
class DragFileViewController: NSViewController {
    @IBOutlet var textView: NSTextView!
    @IBOutlet var dragView: FileDragView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        dragView.delegate = self
    }
    
}

extension DragFileViewController:FileDragDelegate {
    func didFinishDrag(_ fileURL: NSURL) {
        do {
            let string = try String.init(contentsOf: fileURL as URL, encoding: .utf8)
            self.textView.string = string
        } catch  {
            print(error)
        }
    }
}