I’m developing a plugin for Final Cut Pro, and need help on the UI part. FCPX plugins are swift application bundled in a FxPlug wrapper. The UI is made of parameter views packed together, custom parameter views can be created in order to display a logo or a custom element:

I followed the official Apple documentation about FxPlug and managed to get regular parameters working (sliders, integers, etc…). Easy.

However, I can’t get a custom parameter working. Parameters needs to be instantiate in the addParameters method:

func addParameters() throws {

        let paramAPI = _apiManager!.api(for: FxParameterCreationAPI_v5.self) as! FxParameterCreationAPI_v5
        
        // Create the custom parameter   
        paramAPI.addCustomParameter(withName: "Logo", parameterID: 2, defaultValue: NSData(), parameterFlags: FxParameterFlags(kFxParameterFlag_CUSTOM_UI))
    }

I can then link the custom parameter with a NSView in the createView method:

func createView(forParameterID parameterID: UInt32) -> NSView? {

        if parameterID == 2 {
            // Instantiate custom view with the initial frame size
            let myCustomView = CustomView(frame: NSRect(x: 0, y: 0, width: 200, height: 200))
                        
            // Return the view to be managed by the host application
            return myCustomView
        }

        // Return nil for any parameter IDs without custom view
        return nil
    }

My CustomView is a simple Cocoa class (for testing purpose):

import Cocoa
import AppKit

class SimpleTestView: NSView {

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
    }
    
}

I’m running fcpxstudio.com on which I sell Final Cut Pro plugins, I was looking for a freelancer to complete the mission but can’t find anyone qualified for the job. Any help on how to add a custom parameter on the Apple FxPlug template (swift) or offers to complete the job are welcome!