Swift实现简单计算器项目

//
//  ViewController.swift
//  计算器
//
//  Created by 悦兑科技 on 15/1/14.
//  Copyright (c) 2015年 BSY. All rights reserved.
//


import UIKit

class ViewController: UIViewController {

    var numOne = UITextField()
    var numTwo = UITextField()
    var cleanButton = UIButton()

    var sum = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()       
        self.view.backgroundColor = UIColor.brownColor() 
        [self .addAllSubViews()]

    }

    func addAllSubViews()

    {
        // 计算
        var button:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
        var frame = CGRectMake(100, 300, 100, 30)
        button.frame = frame
        self.view.addSubview(button)
        button.backgroundColor = UIColor.lightGrayColor()
        button.setTitle("计算", forState: UIControlState.Normal)
        button.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        button.addTarget(self, action: "OnClick", forControlEvents: UIControlEvents.TouchUpInside)

        // 第一个数
        var numOne = UITextField(frame: CGRectMake(10, 200, 80, 30))
        numOne.placeholder = "输一个数"
        numOne.layer.borderColor = UIColor.lightGrayColor().CGColor
        numOne.layer.borderWidth = 2
        numOne.layer.cornerRadius = 5
        self.view.addSubview(numOne)
        numOne.keyboardType = UIKeyboardType.NumberPad

        self.numOne = numOne  

        var add = UILabel(frame: CGRectMake(100, 200, 20, 30))
        add.text = "+"
        add.font.fontWithSize(20)
        self.view.addSubview(add)
  
        // 第二个数
        var numTwo = UITextField(frame: CGRectMake(120, 200, 80, 30))
        numTwo.placeholder = "输一个数"
        numTwo.layer.borderColor = UIColor.lightGrayColor().CGColor
        numTwo.layer.borderWidth = 2
        numTwo.layer.cornerRadius = 5
        self.view.addSubview(numTwo)
        numTwo.keyboardType = UIKeyboardType.NumberPad
        self.numTwo = numTwo

        var equalTo = UILabel(frame: CGRectMake(210, 200, 20, 30))
        equalTo.text = "="
        equalTo.font.fontWithSize(20)
        self.view.addSubview(equalTo)
        

        // sum  和
        var sum = UILabel(frame: CGRectMake(230, 200, 80, 30))
        sum.textAlignment = NSTextAlignment.Center
        sum.font.fontWithSize(20)
        sum.text = "0"
        self.view.addSubview(sum)
        sum.layer.borderWidth = 2
        sum.layer.borderColor = UIColor.lightGrayColor().CGColor
        self.sum  = sum

    }

    /**
    计算按钮
    */

func OnClick()

{

    var sum =  NSString(string: self.numOne.text).intValue + NSString(string: self.numTwo.text).intValue
    self.sum.text = NSString(string: String(sum))
    [self .addCleanButton()]

}

    /**
    点击界面事件
    */

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        self.numOne.resignFirstResponder()
        self.numTwo.resignFirstResponder()

    }

    /**
    清除按钮
    */

    func addCleanButton(){

        var cleanButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
        var frame = CGRectMake(220, 240, 50, 30)
        cleanButton.frame = frame
        cleanButton.setTitle("清除", forState: UIControlState.Normal)
        cleanButton.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
        self.view.addSubview(cleanButton)        
        cleanButton.addTarget(self, action: "cleanButtonClick", forControlEvents: UIControlEvents.TouchUpInside)
        self.cleanButton = cleanButton

    }

    /**
    清除按钮方法实现
    */

    func cleanButtonClick(){

    self.sum.text = "0"
    self.numOne.text = ""
    self.numTwo.text = ""

        if(self.sum.text=="0"){
        self.cleanButton.hidden = true     

        }

}

}