swift做一个简单的计算器

概述//// ViewController.swift// Calculator//// Created by tutujiaw on 15/4/25.// Copyright (c) 2015年 tutujiaw. All rights reserved.//import UIKitclass ViewController: UIViewController {

////  VIEwController.swift//  Calculator////  Created by tutujiaw on 15/4/25.//  copyright (c) 2015年 tutujiaw. All rights reserved.//import UIKitclass VIEwController: UIVIEwController {    @IBOutlet weak var display: UILabel!    var sumInMemory: Double = 0.0    var sumSoFar: Double = 0.0    var factorSoFar: Double = 0.0    var pendingAdditiveOperator = ""    var pendingMultiplicativeOperator = ""    var waitingForOperand = true        var displayValue: Double {        set {            let intValue = 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 = false        switch pendingOperator {            case "+":            sumSoFar += rightoperand            result = true            case "-":            sumSoFar -= rightoperand            result = true            case "*":            factorSoFar *= rightoperand            result = true            case "/":            if rightoperand != 0.0 {                factorSoFar /= rightoperand                result = true            }        default:            break        }        return result     }        func abortoperation() {        clearall()        display.text = "####"    }        @IBAction func digitClicked(sender: UIbutton) {        let digitValue = 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 = display.text!        display.text = dropLast(strValue)        if display.text!.isEmpty {            displayValue = 0.0            waitingForOperand = true        }    }        @IBAction func clear() {        if waitingForOperand {            return        }                displayValue = 0        waitingForOperand = true    }        @IBAction func clearall() {        sumSoFar = 0.0        factorSoFar = 0.0        pendingAdditiveOperator = ""        pendingMultiplicativeOperator = ""        displayValue = 0.0        waitingForOperand = true    }        @IBAction func clearMemory() {        sumInMemory = 0.0    }        @IBAction func readMemory() {        displayValue = sumInMemory        waitingForOperand = true    }        @IBAction func setMemory() {        equalClicked()        sumInMemory = displayValue    }        @IBAction func addToMemory() {        equalClicked()        sumInMemory += displayValue    }        @IBAction func multiplicativeOperatorClicked(sender: UIbutton) {        var clickedOperator = sender.currentTitle!        var operand = displayValue        if !pendingMultiplicativeOperator.isEmpty {            if !calculate(operand,pendingOperator: pendingMultiplicativeOperator) {                abortoperation()                return            }            displayValue = factorSoFar        } else {            factorSoFar = operand        }                pendingMultiplicativeOperator = clickedOperator        waitingForOperand = true    }        @IBAction func additiveOperatorClicked(sender: UIbutton) {        let clickedOperator = sender.currentTitle!        var operand = displayValue        if !pendingMultiplicativeOperator.isEmpty {            if !calculate(operand,pendingOperator: pendingMultiplicativeOperator) {                abortoperation()                return            }            displayValue = factorSoFar            factorSoFar = 0.0            pendingMultiplicativeOperator = ""        }                if !pendingAdditiveOperator.isEmpty {            if !calculate(operand,pendingOperator: pendingAdditiveOperator) {                abortoperation()                return            }            displayValue = sumSoFar        } else {            sumSoFar = operand        }                pendingAdditiveOperator = clickedOperator        waitingForOperand = true    }        @IBAction func unaryOperatorClicked(sender: UIbutton) {        let clickedOperator = sender.currentTitle!        var result: Double = 0                if 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 == 0 {                abortoperation()                return            }            result = 1.0 / displayValue        }        displayValue = result        waitingForOperand = true    }        @IBAction func equalClicked() {        var operand = displayValue        if !pendingMultiplicativeOperator.isEmpty {            if !calculate(operand,pendingOperator: pendingMultiplicativeOperator) {                abortoperation()                return            }            operand = factorSoFar            factorSoFar = 0.0            pendingMultiplicativeOperator = ""        }                if !pendingAdditiveOperator.isEmpty {            if !calculate(operand,pendingOperator: pendingAdditiveOperator) {                abortoperation()                return            }            pendingAdditiveOperator = ""        } else {            sumSoFar = operand        }                displayValue = sumSoFar        sumSoFar = 0.0        waitingForOperand = true    }}

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