新手获取文本直接转换成数值问题

[qiaozw]

新手就写了个简单的代码，放了一个文本进去然后用代码获取文本内容，同时转换成数值型，写完就报错，帮忙看看为啥。
／＊这两句语法检查一直不过
let num1 = textfilda.text.toInt()!
let num2 = textfildb.text.toInt()!
＊／

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var textfilda: UITextField!
@IBOutlet weak var textfildb: UITextField!
@IBOutlet weak var addresult: UITextField!

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}

//实现加法
@IBAction func myaddcom(sender: AnyObject) {
//获取用户的输入
let num1 = textfilda.text.toInt()!
let num2 = textfildb.text.toInt()!
//计算和求和
let resultNum = num1 + num2
let resultStr = String(resultNum) //转换String类型
//把结果显示出来
self.addresult.text = resultStr
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}


}

[网络咖啡]

Int(textfilfa.text)!