最近刚学Swift，所以就做了个计算器
1.我在做这个计算器的时候用了好多方法。我就把我觉得最的最好的给大家分享一下：
ViewController.swift
//
// ViewController.swift
//
//
// Created by 张凯超 on 15/11/4.
// Copyright © 2015年 张凯超. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
var logic = CalcuLogic()
@IBOutlet weak var mainLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
@IBAction func operandPressed(sender: AnyObject) {
mainLabel.text = logic.calculateByTag(sender.tag,withMainLabelString:mainLabel.text!)
}
@IBAction func numberButtonPressed(sender: AnyObject) {
mainLabel.text = self.logic.updateMainLabelStringByNumberTag(sender.tag, withMainLabelString: mainLabel.text!)
//chenh print(sender.tag!)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func decimalPressed(sender: AnyObject) {
if logic.doesStringContainDecimal(mainLabel.text!) == false{
let string = mainLabel.text! + "."
mainLabel.text = string
}
}
@IBAction func clearPressed(sender: AnyObject) {
mainLabel.text = "0"
logic.clean()
}
@IBAction func equalsPressed(sender: AnyObject) {
mainLabel.text = logic.calculateByTag(sender.tag,withMainLabelString:mainLabel.text!)
}
}
CalcuLogic.swift
//
// CalcuLogic.swift
//
//
// Created by 张凯超 on 15/11/4.
// Copyright © 2015年 张凯超. All rights reserved.
//
import Foundation
enum Operator:Int{
case Plus = 200
case Minus = 201
case Multiply = 202
case Devide = 203
case Default = 0
}
class CalcuLogic {
var lastRetainValue:Double
var operatorV:Operator
var isMainLabelTextTemporary:Bool
init(){
self.lastRetainValue = 0.0
self.operatorV = Operator.Default
isMainLabelTextTemporary = false
}
func doesStringContainDecimal(string:String) ->Bool{
for ch in string.unicodeScalars{
if ch == "."{
return true
}
}
return false
}
func clean(){
lastRetainValue = 0.0
isMainLabelTextTemporary = false
operatorV = Operator.Default
}
func updateMainLabelStringByNumberTag(tag:Int,withMainLabelString mainLabelString:String ) ->String {
var string = mainLabelString
if isMainLabelTextTemporary {
string = "0"
isMainLabelTextTemporary = false
}
// let optNumber = tag - 100;
let optNumber = tag ;
let mainLabelDouble = (string as NSString).doubleValue
if (mainLabelDouble == 0 && doesStringContainDecimal(string) == false) {
return String(optNumber)
}
let resultString = string + String(optNumber)
return resultString
}
func calculateByTag (tag:Int ,withMainLabelString mainLabelString:String) -> String{
let currentValue = (mainLabelString as NSString).doubleValue
switch(operatorV){
case .Plus:
lastRetainValue += currentValue
case .Minus:
lastRetainValue -= currentValue
case .Multiply:
lastRetainValue *= currentValue
case .Devide:
if currentValue != 0{
lastRetainValue /= currentValue
}else
{
operatorV = Operator.Default
isMainLabelTextTemporary = true
return "错误"
}
// 等于号
default:
lastRetainValue = currentValue
}
operatorV = Operator(rawValue: tag)!
let resultString = NSString(format: "%g", lastRetainValue)
isMainLabelTextTemporary = true
return resultString as String
}
}
