Get NSSplitView’s divider view from a subclass (customize divider height and color)

DividerOfSplitView.swift

import Cocoa

class SplitView: NSSplitView {
	
	override var dividerThickness: CGFloat {
		50
	}
	
	override var dividerColor: NSColor {
		NSColor.red
	}
	
	private func searchDividerView() -> [NSView] {
		let dividers = subviews.compactMap {
			type(of: $0) == NSClassFromString("NSSplitDividerView") ? $0 : nil
		}.sorted { v1, v2 in
			if self.isVertical {
				return v1.frame.minY > v2.frame.minY
			}
			return v1.frame.minX < v2.frame.minX
		}
		return dividers
	}
	
	override func awakeFromNib() {
		super.awakeFromNib()
		
		if let dividerView = searchDividerView().first {
			// do something
		}
	}
	
}

Postscript:
I think the method to customize the rect of the divider using the Delegate looks better.

Hiding Dividers in NSSplitView
https://stackoverflow.com/questions/60165351/hiding-dividers-in-nssplitview