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
代码
//
// viewcontroller.swift
// calculator
//
// created by tutujiaw on 15/4/25.
// d88尊龙官网手机app copyright (c) 2015年 tutujiaw. all rights reserved.
//
import uikit
class 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
}
}
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。
