如何在键入时立即更改NSTextField的值？

Question

There are two outlets connected to my ViewController.swift file.

@IBOutlet var myOutlet: NSTextField!
@IBOutlet var yourOutlet: NSTextField!

There is an action connected too.

@IBAction func myAction(sender: NSTextField) {
    self.yourOutlet.doubleValue = myOutlet.doubleValue - 10

When i run the app, it works. I enter 15 to text field that myOutlet connected, then hit the enter. And field that yourOutlet connected, takes the value of 5.

If there is no enter button needed, it would be better. So how to make the value change instantly, as we type?

Thanks for the answers.

Answer 1

I did not get a chance to do swift and OSX development, but I can lead you to the solution.

Take a look at textDidChange(_:)

Posts a notification that the text has changed and forwards this message to the receiver's cell if it responds.

Declaration

func textDidChange(_ aNotification: NSNotification) Parameters aNotification The NSControlTextDidChangeNotification notification that is posted to the default notification center. Discussion This method causes the receiver's delegate to receive a controlTextDidChange: message. See the NSControl class specification for more information on the text delegate method.

So to achieve your goal, you would implement this delegate, it will get called each time you edit the text inside of the NSTextField .Then inside of that delegate block you will provide the logic needed.