1.弹出带有取消和确定以及标题的alertController，并且附带UITextField

@IBAction func testAlert(sender: AnyObject) {

let alertController = UIAlertController(title: "提示",message: "哈哈哈，你懂的",preferredStyle:UIAlertControllerStyle.Alert);

let cancelAction = UIAlertAction(title: "取消",style: UIAlertActionStyle.Cancel) { (action : UIAlertAction) -> Void in

print("点击了取消按钮");

}

let confirmAction = UIAlertAction(title: "确定",style: UIAlertActionStyle.Default) { (action :UIAlertAction) -> Void in

print("点击了确定按钮");

}

alertController.addAction(cancelAction);

alertController.addAction(confirmAction);

alertController.addTextFieldWithConfigurationHandler { (textField : UITextField) -> Void in

//配合textField的代理方法使用

textField.placeholder = "请输入密码";

textField.secureTextEntry = true;

textField.tag = 111;

textField.delegate = self;

}

self.presentViewController(alertController,animated: true) { () -> Void in

print("已经弹出");

};

}