swift怎么实现简易计算器项目

swift怎么实现简易计算器项目，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

首先在storyboard中搭建出界面

接着上viewcontroller代码

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        }    }}

最后效果图

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