macos - Getting Mouse Coordinates in Swift

Question

Swift newbie here.

I've been having trouble with a task that should be trivial. All I want to do is get the x,y coordinates of the mouse cursor on-demand. I would prefer not to wait for a mouse movement event to fire before I can grab the pointer's coords.

Would appreciate any help!

Answer 1

You should take a look at NSEvent method mouseLocation

edit/update: Xcode 11 ? Swift 5.1

If you would like to monitor events on any window when your app is active, you can add a LocalMonitorForEvents matching mouseMoved mask and if it is not active a GlobalMonitorForEvents. Note that you need set to your window property acceptsMouseMovedEvents to true

import Cocoa

class ViewController: NSViewController {
    lazy var window: NSWindow = self.view.window!
    var mouseLocation: NSPoint { NSEvent.mouseLocation }
    var location: NSPoint { window.mouseLocationOutsideOfEventStream }
    override func viewDidLoad() {
        super.viewDidLoad()
        NSEvent.addLocalMonitorForEvents(matching: [.mouseMoved]) {
            print("mouseLocation:", String(format: "%.1f, %.1f", self.mouseLocation.x, self.mouseLocation.y))
            print("windowLocation:", String(format: "%.1f, %.1f", self.location.x, self.location.y))
            return $0
        }
        NSEvent.addGlobalMonitorForEvents(matching: [.mouseMoved]) { _ in
            print(String(format: "%.0f, %.0f", self.mouseLocation.x, self.mouseLocation.y))
        }
    }
    override func viewWillAppear() {
        super.viewWillAppear()
        window.acceptsMouseMovedEvents = true
    }
}

Sample project