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在以下代码片段中，Xcode 推荐“使用#selector 而不是显式构造选择器”的原因是什么？
// addButton = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.Add,
// target: self, action: #selector(FoldersMaintenanceVC.addButtonPressed))
addButton = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.Add,
target: self, action: Selector("addButtonPressed"))
self.navigationItem.leftBarButtonItem = addButton
func addButtonPressed()
{
myNslogSys2(self, funcName:#function)
}