ioS- 简单计算器

 1》首次学习IOS(Swift)开发

 

第一个UI界面程序： 简单的计算器，主要先熟悉swift 基本语法，用惯了其他的语言，所以写代码时比较容易出错，好在xcode编译器很强，对于界面布局来说跟android 差远了，估计我还没有真正学会他的原理以及使用现有的一些组件进行辅助开发。

 

这个程序主要功能点：

 1 首先进行界面布局 ，自己拖动，人为计算控件的大小

 2 controller 中进行界面组件绑定以及增加事件。

 3 具体计算 ，录入，相关业务整理到具体类中实现。

 

具体的图如下

 

 

相关代码：

 

controller：

 /*
    Init ui widget and add event
    */
    func initUI() {
        label = self.view.viewWithTag(100) as! UILabel
        btnCalc = self.view.viewWithTag(99) as! UIButton
        btnBack = self.view.viewWithTag(98) as! UIButton
        btnClear = self.view.viewWithTag(97) as! UIButton
       
        btnCalc.addTarget(self, action: Selector("calcResult"), forControlEvents: .TouchUpInside)
       
        btnClear.addTarget(self, action: Selector("clickClearUI"), forControlEvents: .TouchUpInside)
       
        btnBack.addTarget(self, action: Selector("clickBackUI"), forControlEvents: .TouchUpInside)
       
        // operator add event
        for a in 80...83 {
            let btn  = self.view.viewWithTag(a) as! UIButton
            btn.addTarget(self, action: Selector("clickOpt:"), forControlEvents: .TouchUpInside)
           
        }
       
        for b in 1...10 {
            let v = self.view.viewWithTag(b)
            if v != nil && v?.isKindOfClass(UIButton) == true {
                let btn = v as! UIButton
                btn.addTarget(self, action: Selector("clickNum:"), forControlEvents: .TouchUpInside)
            }
           
        }
       
       
       
       
    }

 

业务实现类：

//
//  CalcModel.swift
//  calculator
//
//  Created by mjp on 16/1/20.
//  Copyright © 2016年 mjp. All rights reserved.
//

import Foundation

class CalcModel{
    var opt0 : String = ""
   
    var opt1: String = ""
   
    var opt: Int = -1
    /*
     Input data from ui data
    */
    func inputData(var input : Int){
        if input >= 10 {
            input = 0
        }
       
        if opt  != -1 {
            opt1.appendContentsOf(String(input))
        }else{
            opt0.appendContentsOf(String(input))
        }
    }
   
    /*
     Input operator (+ - * /) mappings(80 81 82 83)
    */
    func inputOpt(input : Int){
        self.opt = input
    }
   
    /*
     Calc result
    */
    func calc() -> String {
        var rb : String = String("")
        let op0 : Int? = Int(opt0)
        let op1 : Int? = Int(opt1)
        if op0 != nil && op1 != nil  && opt != -1{
           
            switch opt{
            case 80 :
                // +
                let t = op0! + op1!
                rb = "\(t)"
            case 81 :
                // -
                let t = op0! - op1!
                rb = "\(t)"
            case 82 :
                // *
                let t = op0! * op1!
                rb = "\(t)"
            case 83 :
                 // /
                if op1 == nil || op1 != 0 {
                    rb = "0"
                } else {
                    let t = op0! / op1!
                    rb = "\(t)"
                }
            default:
                rb = ""
               
            }

        }
       
        return rb
    }
   
    /*
    Reset data and operator
    */
    func clear() {
        opt = -1
        opt0 = ""
        opt1 = ""
    }
   
    /*
    Back data and operator
    */
    func back(){
        if opt == -1 {
            if opt0.characters.count == 0{
                let b = opt0.characters.count
                if  b > 0 {
                    let index = opt0.startIndex.advancedBy(b - 1) //swift 2.0+
                    opt0.removeAtIndex(index)
                   
                }
             }
        } else if opt >= 80 && opt <= 83 {
            if opt1.characters.count > 0 {
                let b = opt1.characters.count
                if  b > 0 {
                    let index = opt1.startIndex.advancedBy(b - 1) //swift 2.0+
                    opt1.removeAtIndex(index)
                   
                }
            } else {
                 opt = -1
            }
        } else {
            clear()
        }
    }
   
    /*
    Show input datas
    */
    func showLabel() -> String {
        let flag = self.opt
        var result = ""
            switch flag {
            case -1 :
                result = "\(opt0)"
            case 80 :
                result =  "\(opt0)+\(opt1)"
            case 81 :
                result =  "\(opt0)-\(opt1)"
            case 82 :
                result =  "\(opt0)*\(opt1)"
            case 83 :
                result =  "\(opt0)/\(opt1)"
            default :
                result =  ""
            }
            return result
      
    }
}