Oto przykład, którego używam w aplikacji.
- Dodaj zgodność z
NSDraggingDestination
do deklaracji podklasy, jeśli to konieczne (nie potrzebne NSImageView
bo to już jest zgodny z protokołem)
- Zadeklaruj tablicę akceptowanych typów (przynajmniej
NSFilenamesPboardType
)
- zarejestrować te typy z
registerForDraggedTypes
- Zastąp
draggingEntered
, draggingUpdated
i performDragOperation
- zwróci
NSDragOperation
z tych metod
- Pobierz plik (s) Ścieżka (ów) z tablicy
draggingPasteboard
w moim przykładzie dodałem funkcję, aby sprawdzić, czy rozszerzenie pliku jest wśród tych, których chcemy.
Swift 2
class MyImageView: NSImageView {
override func drawRect(dirtyRect: NSRect) {
super.drawRect(dirtyRect)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
// Declare and register an array of accepted types
registerForDraggedTypes([NSFilenamesPboardType, NSURLPboardType, NSPasteboardTypeTIFF])
}
let fileTypes = ["jpg", "jpeg", "bmp", "png", "gif"]
var fileTypeIsOk = false
var droppedFilePath: String?
override func draggingEntered(sender: NSDraggingInfo) -> NSDragOperation {
if checkExtension(sender) {
fileTypeIsOk = true
return .Copy
} else {
fileTypeIsOk = false
return .None
}
}
override func draggingUpdated(sender: NSDraggingInfo) -> NSDragOperation {
if fileTypeIsOk {
return .Copy
} else {
return .None
}
}
override func performDragOperation(sender: NSDraggingInfo) -> Bool {
if let board = sender.draggingPasteboard().propertyListForType("NSFilenamesPboardType") as? NSArray,
imagePath = board[0] as? String {
// THIS IS WERE YOU GET THE PATH FOR THE DROPPED FILE
droppedFilePath = imagePath
return true
}
return false
}
func checkExtension(drag: NSDraggingInfo) -> Bool {
if let board = drag.draggingPasteboard().propertyListForType("NSFilenamesPboardType") as? NSArray,
path = board[0] as? String {
let url = NSURL(fileURLWithPath: path)
if let fileExtension = url.pathExtension?.lowercaseString {
return fileTypes.contains(fileExtension)
}
}
return false
}
}
Swift 3
class MyImageView: NSImageView {
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
// Declare and register an array of accepted types
register(forDraggedTypes: [NSFilenamesPboardType, NSURLPboardType, NSPasteboardTypeTIFF])
}
let fileTypes = ["jpg", "jpeg", "bmp", "png", "gif"]
var fileTypeIsOk = false
var droppedFilePath: String?
override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
if checkExtension(drag: sender) {
fileTypeIsOk = true
return .copy
} else {
fileTypeIsOk = false
return []
}
}
override func draggingUpdated(_ sender: NSDraggingInfo) -> NSDragOperation {
if fileTypeIsOk {
return .copy
} else {
return []
}
}
override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
if let board = sender.draggingPasteboard().propertyList(forType: "NSFilenamesPboardType") as? NSArray,
imagePath = board[0] as? String {
// THIS IS WERE YOU GET THE PATH FOR THE DROPPED FILE
droppedFilePath = imagePath
return true
}
return false
}
func checkExtension(drag: NSDraggingInfo) -> Bool {
if let board = drag.draggingPasteboard().propertyList(forType: "NSFilenamesPboardType") as? NSArray,
path = board[0] as? String {
let url = NSURL(fileURLWithPath: path)
if let fileExtension = url.pathExtension?.lowercased() {
return fileTypes.contains(fileExtension)
}
}
return false
}
}
https://developer.apple.com/library/mac/ dokumentacja/Cocoa/Conceptual/D ragandDrop/Tasks/DraggingFiles.html –