How to handle escape key press event? [duplicate] - swift

Question

This question already has answers here:
Swift - Capture keydown from NSViewController
(5 answers)
the "funk" sound when hitting escape key in app
(1 answer)
Closed 5 years ago.
In Swift, is there a function in Cocoa framework to handle the press so that you can register which keyboard key has been hit?
I'd like to get the escape key
UPDATED:
i just found that the noise was casued by
super.keyDown(with: event)
wich is not needed for the thing to work
why did u add that line?

Answer 1

Create a subclass of NSWindow and implement keyDown event:
import Cocoa
import Carbon.HIToolbox
class CustomWindow: NSWindow {
override func keyDown(with event: NSEvent) {
switch Int(event.keyCode) {
case kVK_Escape:
print("Esc pressed")
default:
break
}
super.keyDown(with: event)
}
}
This line:
import Carbon.HIToolbox
Lets you use handy constants for keys, such as kVK_Escape.
Set this class as your main window class in the Interface Builder and you're all set:
P.S. To do the same form NSViewController, in viewDidLoad do:
NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
self.keyDown(with: $0)
return $0
}
P.P.S. To mute "bang" sound, don't call super upon Escape key press - move super call to default:
default:
super.keyDown(with: event)
EDIT:
If you don't want any sound on Escape key press, then the following approach should be used:
Make an NSView subclass and set it to main view of the view controller:
import Cocoa
import Carbon.HIToolbox
class CustomView: NSView {
override func performKeyEquivalent(with event: NSEvent) -> Bool {
switch Int(event.keyCode) {
case kVK_Escape:
print("Esc pressed")
return true
default:
return super.performKeyEquivalent(with: event)
}
}
}