如何在我的MacOS应用程序中拖放电影文件（.mov）？

Posted 2021-04-20

我知道如何在我的MacOS应用程序中拖放图像文件（使用draggingEntered：，prepareForDragOperation：和performDragOperation :)方法。但我无法弄清楚如何对电影文件做同样的事情。这是可能的，如果可以的话怎么办？ （如果要查看一些示例代码，将会很有帮助）。

答案

它基本上应该是相同的，除了接受的文件成为电影文件。

您的示例代码：

DragContainer.swift文件

import Cocoa

protocol DragContainerDelegate {
    func draggingEntered()
    func draggingExit()
    func draggingFileAccept(_ file: URL)
}

class DragContainer: NSView {
    var delegate: DragContainerDelegate?

    let acceptTypes = ["mov", "mp4", "avi", "m4v"]


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

    required init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        setup()
    }

    func setup(){
        registerForDraggedTypes([NSPasteboard.PasteboardType(kUTTypeFileURL as String),
                                 NSPasteboard.PasteboardType(kUTTypeItem as String)])
    }


    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
    }

    override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
        delegate?.draggingEntered()
        let acceptFiles = checkExtension(sender)
        return acceptFiles ? NSDragOperation.generic : NSDragOperation()
    }

    override func draggingExited(_ sender: NSDraggingInfo?) {
        delegate?.draggingExit()
    }

    override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
        if let board = sender.draggingPasteboard().propertyList(forType: NSPasteboard.PasteboardType(rawValue:"NSFilenamesPboardType")) as? [String],
            let path = board.first{
            let url = URL(fileURLWithPath: path)
            delegate?.draggingFileAccept(url)
            return true
        }
        return false
    }

    func checkExtension(_ draggingInfo: NSDraggingInfo) -> Bool {
        if let board = draggingInfo.draggingPasteboard().propertyList(forType: NSPasteboard.PasteboardType(rawValue:"NSFilenamesPboardType")) as? [String],
            let path = board.first{
            let url = URL(fileURLWithPath: path)
            let fileExtension = url.pathExtension.lowercased()
            if acceptTypes.contains(fileExtension) {
                return true
            }
        }
        return false
    }

}

ViewController.swift文件

class ViewController: NSViewController,DragContainerDelegate {
    func draggingEntered() {

    }

    func draggingExit() {

    }

    func draggingFileAccept(_ file: URL) {
        print(file)
        // do whatever you want here 
    }


    @IBOutlet weak var dragContainer: DragContainer!

    override func viewDidLoad() {
        super.viewDidLoad()

        dragContainer.delegate = self
    }

    override var representedObject: Any? {
        didSet {
        // Update the view, if already loaded.
        }
    }


}