swiftcore-audiocore-bluetoothmidicoremidi

Open MIDI Bluetooth Configuration pane of MacOS programatically from Swift

I can open the Audio MIDI Setup app programatically like this:

NSWorkspace.shared.launchApplication("Audio MIDI Setup")

But how can I open the Bluetooth Configuration window inside the app?

Bluetooth Configuration window

I've seen other apps having a menu item which opens up this dialog directly.

Solution

  • Apple provides a window controller for developers to use called CABTLEMIDIWindowController. The documentation is pretty sparse, but there is a bit more information in the code comments:

    /**
@class CABTLEMIDIWindowController

@abstract  A window controller object that can present a window that displays nearby
 Bluetooth-based MIDI peripherals. The user can select one of those peripherals and 
 pair it with their mac. Additionally, the user can advertise the mac as a 
 Bluetooth-based MIDI peripheral.
 
@discussion To use this class, create an instance of the CABTLEMIDIWindowController,
 initialize it, and call showWindow: to display the UI.
*/

    Usage is surprisingly straightforward:

    let windowController = CABTLEMIDIWindowController()
windowController.showWindow(self)

    NOTE:

    Your app must have bluetooth configured and approved otherwise the window controller will appear like this:

    Error

    You must select Bluetooth from the App Sandbox settings and add the NSBluetoothAlwaysUsageDescription key to your Info.plist:

    setup

    FULL EXAMPLE:

    import Cocoa
import CoreBluetooth
import CoreAudioKit

class ViewController: NSViewController, CBCentralManagerDelegate {
    fileprivate var centralManager: CBCentralManager!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }
    
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        if (central.state == .poweredOn) {
            let windowController = CABTLEMIDIWindowController()
            windowController.showWindow(self)
        }
    }
}

    Success

    BONUS:

    Found this while snooping around. Saves users a lot of clicks by opening System Preferences -> Security & Privacy -> Privacy -> Bluetooth:

    NSWorkspace.shared.open(URL(string: "x-apple.systempreferences:com.apple.preference.security?Privacy_Bluetooth")!)