let alert = UIAlertController(title: "溫馨提示", message: "1.哈哈哈哈哈哈哈哈哈哈或或。\n2.哈哈哈哈哈啊哈哈啊。", preferredStyle: .alert)

let subView1 : UIView = alert.view.subviews[0]

let subView2 : UIView = subView1.subviews[0]

let subView3 : UIView = subView2.subviews[0]

let subView4 : UIView = subView3.subviews[0]

let subView5 : UIView = subView4.subviews[0]

// ? ?let title = subView5.subviews[0] as! UILabel

let message = subView5.subviews[1] as! UILabel

message.textAlignment = .left

alert.addAction(UIAlertAction(title: "確定", style: UIAlertActionStyle.default) { (_) in

})

present(VC, animated: true, completion: nil)

參考文章：http://www.lxweimin.com/p/b84e1bc81666