Swift如何实现简单计算器项目

本篇文章为大家展示了Swift如何实现简单计算器项目，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

////  ViewController.swift//  计算器////  Created by 悦兑科技 on 15/1/14.//  Copyright (c) 2015年 BSY. All rights reserved.//import UIKitclass ViewController: UIViewController {    var numOne = UITextField()    var numTwo = UITextField()    var cleanButton = UIButton()    var sum = UILabel()    override func viewDidLoad() {        super.viewDidLoad()               self.view.backgroundColor = UIColor.brownColor()         [self .addAllSubViews()]    }    func addAllSubViews()    {        // 计算        var button:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton        var frame = CGRectMake(100, 300, 100, 30)        button.frame = frame        self.view.addSubview(button)        button.backgroundColor = UIColor.lightGrayColor()        button.setTitle("计算", forState: UIControlState.Normal)        button.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        button.addTarget(self, action: "OnClick", forControlEvents: UIControlEvents.TouchUpInside)        // 第一个数        var numOne = UITextField(frame: CGRectMake(10, 200, 80, 30))        numOne.placeholder = "输一个数"        numOne.layer.borderColor = UIColor.lightGrayColor().CGColor        numOne.layer.borderWidth = 2        numOne.layer.cornerRadius = 5        self.view.addSubview(numOne)        numOne.keyboardType = UIKeyboardType.NumberPad        self.numOne = numOne          var add = UILabel(frame: CGRectMake(100, 200, 20, 30))        add.text = "+"        add.font.fontWithSize(20)        self.view.addSubview(add)          // 第二个数        var numTwo = UITextField(frame: CGRectMake(120, 200, 80, 30))        numTwo.placeholder = "输一个数"        numTwo.layer.borderColor = UIColor.lightGrayColor().CGColor        numTwo.layer.borderWidth = 2        numTwo.layer.cornerRadius = 5        self.view.addSubview(numTwo)        numTwo.keyboardType = UIKeyboardType.NumberPad        self.numTwo = numTwo        var equalTo = UILabel(frame: CGRectMake(210, 200, 20, 30))        equalTo.text = "="        equalTo.font.fontWithSize(20)        self.view.addSubview(equalTo)                // sum  和        var sum = UILabel(frame: CGRectMake(230, 200, 80, 30))        sum.textAlignment = NSTextAlignment.Center        sum.font.fontWithSize(20)        sum.text = "0"        self.view.addSubview(sum)        sum.layer.borderWidth = 2        sum.layer.borderColor = UIColor.lightGrayColor().CGColor        self.sum  = sum    }    /**    计算按钮    */func OnClick(){    var sum =  NSString(string: self.numOne.text).intValue + NSString(string: self.numTwo.text).intValue    self.sum.text = NSString(string: String(sum))    [self .addCleanButton()]}    /**    点击界面事件    */    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {        self.numOne.resignFirstResponder()        self.numTwo.resignFirstResponder()    }    /**    清除按钮    */    func addCleanButton(){        var cleanButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton        var frame = CGRectMake(220, 240, 50, 30)        cleanButton.frame = frame        cleanButton.setTitle("清除", forState: UIControlState.Normal)        cleanButton.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)        self.view.addSubview(cleanButton)                cleanButton.addTarget(self, action: "cleanButtonClick", forControlEvents: UIControlEvents.TouchUpInside)        self.cleanButton = cleanButton    }    /**    清除按钮方法实现    */    func cleanButtonClick(){    self.sum.text = "0"    self.numOne.text = ""    self.numTwo.text = ""        if(self.sum.text=="0"){        self.cleanButton.hidden = true             }}}

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