import UIKit


class ViewController: UIViewController {


@IBOutlet weak var textOne: UITextField!

@IBOutlet weak var textTwo: UITextField!

@IBOutlet weak var textResult: UILabel!

@IBAction func calculate() {

var num1 = self.textOne.text.toInt()//从UITextField读取int

var num2 = self.textTwo.text.toInt()

if (self.textOne.text.isEmpty){

num1 = 0

}

if (!self.textTwo.hasText()){

num2 = 0

}

var resultNum = num1! + num2!//加！号?


//两种从int转string的方法

var resultString = String.convertFromStringInterpolationSegment(resultNum)

var resultString2 = "\(resultNum)"

self.textResult.text = resultString2 //UILabel赋值


self.textOne.endEditing(true)

self.textTwo.endEditing(true)

}

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.

}


override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}



}