Swift: Opening a file by drag-and-drop in window

Question

In Swift, how can I build an area in a window of my Mac app where a user can drag-and-drop a folder onto this area, and have my app receive the path of the folder?

In pr

Answer 1

my 2 cents for OSX - swift 5 (and fixed for loading from XIBs/storybord.)

//  Created by ing.conti on 31th jan 2020.
//

import Cocoa

class AnalysisView: NSView {

    override init(frame frameRect: NSRect)
    {
        super.init(frame: frameRect)
        self.registerMyTypes()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        self.registerMyTypes()
    }


    final private func registerMyTypes()
    {
        registerForDraggedTypes(
            [NSPasteboard.PasteboardType.URL,
             NSPasteboard.PasteboardType.fileURL,
             NSPasteboard.PasteboardType.png,
             NSPasteboard.PasteboardType.fileNameType(forPathExtension: "wtf")
        ])
    }



    override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
        print("draggingEntered")
        return NSDragOperation.copy
    }

    override func prepareForDragOperation(_ sender: NSDraggingInfo) -> Bool {
        let allow = true // check your types...
        print("prepareForDragOperation")
        return allow
    }

    override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {

        let pasteBoard = sender.draggingPasteboard
        print("performDragOperation")

        if let urls = pasteBoard.readObjects(forClasses: [NSURL.self]) as? [URL]{
            // consume them...
            print(urls)
            return true
        }
        return false
    }
}