如何从 Swift 中的 URL(NSURL) 获取最后一个字符串组件

Swift 2.3

let url = NSURL(string: "http://google.com/lastPath")
let lastPath = url?.lastPathComponent

Swift 3.0

  let url = URL(string: "http://google.com/lastPath")
  let lastPath = url?.lastPathComponent