NSOpenPanel as sheet - swift

Question

Ive looked around at other answers, but nothing seems to be helping my case.
I have a viewController class which contains an IBAction for a button. This button should open a NSOpenPanel as a sheet from that viewController:
class ViewController: NSViewController {
#IBAction func folderSelection(sender: AnyObject) {
var myFiledialog: NSOpenPanel = NSOpenPanel()
myFiledialog.prompt = "Select path"
myFiledialog.worksWhenModal = true
myFiledialog.allowsMultipleSelection = false
myFiledialog.canChooseDirectories = true
myFiledialog.canChooseFiles = false
myFiledialog.resolvesAliases = true
//myFiledialog.runModal()
myFiledialog.beginSheetModalForWindow(self.view.window!, completionHandler: nil)
var chosenpath = myFiledialog.URL
if (chosenpath!= nil)
{
var TheFile = chosenpath!.absoluteString!
println(TheFile)
//do something with TheFile
}
else
{
println("nothing chosen")
}
}
}
The problem comes from myFileDialog.beginSheetModalForWindow(..) , it works with the line above, but that is not a sheet effect

Answer 1

You need to call beginSheetModalForWindow from your panel on your window, and use a completion block:
let myFiledialog = NSOpenPanel()
myFiledialog.prompt = "Select path"
myFiledialog.worksWhenModal = true
myFiledialog.allowsMultipleSelection = false
myFiledialog.canChooseDirectories = true
myFiledialog.canChooseFiles = false
myFiledialog.resolvesAliases = true
myFiledialog.beginSheetModalForWindow(window, completionHandler: { num in
if num == NSModalResponseOK {
let path = myFiledialog.URL
print(path)
} else {
print("nothing chosen")
}
})

Answer 2

Swift 5
let dialog = NSOpenPanel()
dialog.beginSheetModal(for: self.view.window!){ result in
if result == .OK, let url = dialog.url {
print("Got", url)
}
}