swift实现简单的计算器 swift实现简单的计算器

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

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代码

////ViewController.swift//Calculator////Created by tutujiaw on 15/4/25.//Copyright (c) 2015年 tutujiaw. All rights reserved.// import UIKit class ViewController: UIViewController { @IBOutlet weak var display: UILabel!var sumInMemory: Double = 0.0var sumSoFar: Double = 0.0var factorSoFar: Double = 0.0var pendingAdditiveOperator = ""var pendingMultiplicativeOperator = ""var waitingForOperand = truevar displayValue: Double {set {let intValue = https://www.it610.com/article/Int(newValue)if (Double(intValue) == newValue) {display.text ="\(intValue)"} else {display.text = "\(newValue)"}}get {return (display.text! as NSString).doubleValue}}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.} func calculate(rightOperand: Double, pendingOperator: String) -> Bool {var result = falseswitch pendingOperator {case "+":sumSoFar += rightOperandresult = truecase "-":sumSoFar -= rightOperandresult = truecase "*":factorSoFar *= rightOperandresult = truecase "/":if rightOperand != 0.0 {factorSoFar /= rightOperandresult = true}default:break}return result}func abortOperation() {clearAll()display.text = "####"}@IBAction func digitClicked(sender: UIButton) {let digitValue = https://www.it610.com/article/sender.currentTitle?.toInt()if display.text!.toInt() == 0 && digitValue == 0 {return}if waitingForOperand {display.text =""waitingForOperand = false}display.text = display.text! + sender.currentTitle!} @IBAction func changeSignClicked() {displayValue *= -1}@IBAction func backspaceClicked() {if waitingForOperand {return}var strValue = https://www.it610.com/article/display.text!display.text = dropLast(strValue)if display.text!.isEmpty {displayValue = 0.0waitingForOperand = true}}@IBAction func clear() {if waitingForOperand {return}displayValue = 0waitingForOperand = true}@IBAction func clearAll() {sumSoFar = 0.0factorSoFar = 0.0pendingAdditiveOperator =""pendingMultiplicativeOperator = ""displayValue = https://www.it610.com/article/0.0waitingForOperand = true}@IBAction func clearMemory() {sumInMemory = 0.0}@IBAction func readMemory() {displayValue = sumInMemorywaitingForOperand = true}@IBAction func setMemory() {equalClicked()sumInMemory = displayValue}@IBAction func addToMemory() {equalClicked()sumInMemory += displayValue}@IBAction func multiplicativeOperatorClicked(sender: UIButton) {var clickedOperator = sender.currentTitle!var operand = displayValueif !pendingMultiplicativeOperator.isEmpty {if !calculate(operand, pendingOperator: pendingMultiplicativeOperator) {abortOperation()return}displayValue = factorSoFar} else {factorSoFar = operand}pendingMultiplicativeOperator = clickedOperatorwaitingForOperand = true}@IBAction func additiveOperatorClicked(sender: UIButton) {let clickedOperator = sender.currentTitle!var operand = displayValueif !pendingMultiplicativeOperator.isEmpty {if !calculate(operand, pendingOperator: pendingMultiplicativeOperator) {abortOperation()return}displayValue = factorSoFarfactorSoFar = 0.0pendingMultiplicativeOperator =""}if !pendingAdditiveOperator.isEmpty {if !calculate(operand, pendingOperator: pendingAdditiveOperator) {abortOperation()return}displayValue = https://www.it610.com/article/sumSoFar} else {sumSoFar = operand}pendingAdditiveOperator = clickedOperatorwaitingForOperand = true}@IBAction func unaryOperatorClicked(sender: UIButton) {let clickedOperator = sender.currentTitle!var result: Double = 0if clickedOperator =="Sqrt" {if displayValue < 0 {abortOperation()return}result = sqrt(displayValue)} else if clickedOperator == "x^2" {result = pow(displayValue, 2)} else if clickedOperator == "1/x" {if displayValue =https://www.it610.com/article/= 0 {abortOperation()return}result = 1.0 / displayValue}displayValue = resultwaitingForOperand = true}@IBAction func equalClicked() {var operand = displayValueif !pendingMultiplicativeOperator.isEmpty {if !calculate(operand, pendingOperator: pendingMultiplicativeOperator) {abortOperation()return}operand = factorSoFarfactorSoFar = 0.0pendingMultiplicativeOperator =""}if !pendingAdditiveOperator.isEmpty {if !calculate(operand, pendingOperator: pendingAdditiveOperator) {abortOperation()return}pendingAdditiveOperator = ""} else {sumSoFar = operand}displayValue = https://www.it610.com/article/sumSoFarsumSoFar = 0.0waitingForOperand = true}}

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