Pencilkit-navigationbar.swift

func setNavigationBar() {
        if let navItem = navigationBar.topItem{
            
            let detectItem = UIBarButtonItem(title: "Detect", style: .done, target: self, action: #selector(detectImage))
            let clearItem = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clear))
navItem.rightBarButtonItems = [clearItem,detectItem]
            navItem.leftBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)
            
        }
}