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Swift how to achieve a simple calculator project, many novices are not very clear about this, in order to help you solve this problem, the following small series will explain in detail for everyone, there are people who need this can learn, I hope you can gain something.

First, create an interface in storyboard.

Next up is the viewcontroller code.

import UIKitclass ViewController: UIViewController { @IBOutlet weak var result: UILabel! var n1: String = "" var n2: String = "" var n3: String = "" 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. } @IBAction func didClick(sender: UIButton) { let temp = sender.currentTitle if temp == "AC" { n1 = "" n2 = "" result.text = "0" return } else if temp == "+" || temp == "-" || temp == "*" || temp == "/" { n1 = result.text! n2 = "" n3 = temp! return } else if temp == "=" { var result1: Double = 0 println("n1:"+n1+" n2:"+n2) switch n3 { case "+": result1 = (n1 as NSString).doubleValue + (n2 as NSString).doubleValue case "-": result1 = (n1 as NSString).doubleValue - (n2 as NSString).doubleValue case "*": result1 = (n1 as NSString).doubleValue * (n2 as NSString).doubleValue case "/": result1 = (n1 as NSString).doubleValue / (n2 as NSString).doubleValue default: result1 = 0 } result.text = "\(result1)" n3 = "" return } if n3 != "" { n2 = n2 + temp! result.text = n2 }else { n1 = n1 + temp! result.text = n1 } }}

Final rendering

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