Closure use of non-escaping parameter 'xxx' may allow it to escape

新版的Swift閉包做參數默認是@noescaping，不再是@escaping。所以如果函數里異步執行該閉包，要添加@escaping。否則報錯：Closure use of non-escaping parameter 'xxx' may allow it to escape.

func delay(seconds: Double, completion: @escaping () -> Void) {
    DispatchQueue.main.asyncAfter(deadline: .now() + seconds) {
        completion()
    }
}