本文实例为大家分享了Swift实现简单计算器的具体代码，供大家参考，具体内容如下
使用Storyboard
快速而又方便的进行控件的布局,功能操作简单的进行一些运算;
代码实现
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//// ViewController.swift// Swift_Calculator//// Created by 周文春 on 16/3/2.// Copyright © 2016年 周文春. All rights reserved.//import UIKitclass ViewController: UIViewController { @IBOutlet weak var lableResult: UILabel! //第一操作 var firstOperand: Double = 0.0 //第二操作 var secondOperand: Double = 0.0 //标记是否输入了小数点 var decimalPointFlag: Bool = false //是否输入第二操作数 var isSecond: Bool = false //操作符 var operatorFlag: 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 buttonTap(sender: UIButton) { //lableResult 中默认是0,如果开始输入数字,则先清除0 if lableResult.text == "0" || (isSecond && secondOperand == 0.0) { lableResult.text = "" } //将用户录入的数添加到lableResult中 lableResult.text = lableResult.text! + sender.titleLabel!.text! if isSecond {// secondOperand = (lableResult.text! as NSString).doubleValue secondOperand = NSString(string: lableResult.text!).doubleValue }else { //将lableResult中的字符串转化为双精度数// firstOperand = (lableResult.text! as NSString).doubleValue firstOperand = NSString(string: lableResult.text!).doubleValue } print(firstOperand) } @IBAction func decimalPointTap() { if !decimalPointFlag { lableResult.text = lableResult.text! + "." if isSecond { secondOperand = (lableResult.text! as NSString).doubleValue }else { firstOperand = (lableResult.text! as NSString).doubleValue } decimalPointFlag = !decimalPointFlag } } @IBAction func operatorTap(sender: UIButton) { if firstOperand != 0 { isSecond = true decimalPointFlag = false switch sender.titleLabel!.text! { case "+": operatorFlag = "+" case "-": operatorFlag = "-" case "*": operatorFlag = "*" case "÷": operatorFlag = "/" default: operatorFlag = " " } } } @IBAction func resultTap(sender: UIButton) { //确保第二操作数有值 if isSecond { //除数不能为0 if operatorFlag == "/" && secondOperand == 0 { print("Error: 除数不能为0") return } var result: Double = 0.0 switch operatorFlag { case "+": result = firstOperand + secondOperand case "-": result = firstOperand - secondOperand case "*": result = firstOperand * secondOperand case "/": result = firstOperand / secondOperand default : result = 0.0 } lableResult.text = result.description print("第一操作: \(firstOperand)") print("操作符: \(operatorFlag)") print("第二操作: \(secondOperand)") print("结果: \(result)") } } @IBAction func clear(sender: UIButton) { //lable对象显示0 lableResult.text = "0" //第一操作数清零 firstOperand = 0.0 //第二操作数清零 secondOperand = 0.0 //小数点标记设置为假 decimalPointFlag = false //第二操作数标记设置为假 isSecond = false //操作清空 operatorFlag = "" }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_29284809/article/details/50803536
