[Mac Catalyst] a helper method that creates NSToolbar image with SF Symbol

UIImage+NSToolbar.swift

//
//  UIImage+NSToolbar.swift
//  MobileReaderUI
//
//  Created by Jonny Kuang on 10/12/19.
//  Copyright © 2019 Junyu Kuang <[email protected]>. All rights reserved.
//

#if targetEnvironment(macCatalyst)
extension UIImage {
    
    func symbolForNSToolbar() -> UIImage? {
        guard let symbol = applyingSymbolConfiguration(.init(pointSize: 13)) else { return nil }
        
        let format = UIGraphicsImageRendererFormat()
        format.preferredRange = .standard
        
        return UIGraphicsImageRenderer(size: symbol.size, format: format).image {
            _ in symbol.draw(at: .zero)
        }.withRenderingMode(.alwaysTemplate)
    }
}
#endif

Thanks "chevron.left" was too big for a back button until I found this