swift写的一款计算器demo

用swift写的一个计算器demo，类似iphone原生的计算器，不过没有高级运算。暂不支持小数点，一个小demo，仅供想学习swift的新手参考。。连续运算时有bug，不想改了，有兴趣的同学自己改改吧>_<!

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2014-06-16 14:55  myFirstSwiftApp\
     文件        6148  2014-06-12 23:38  myFirstSwiftApp\.DS_Store
     文件         120  2014-06-12 23:38  myFirstSwiftApp\._.DS_Store
     文件         396  2014-06-16 14:37  myFirstSwiftApp\._calculator.png
     文件         396  2014-06-16 14:39  myFirstSwiftApp\._calculator_512.png
     文件         396  2014-06-16 14:42  myFirstSwiftApp\._calulator-alt3.png
     文件        2963  2014-06-16 14:37  myFirstSwiftApp\calculator.png
     文件      127280  2014-06-16 14:39  myFirstSwiftApp\calculator_512.png
     文件       19562  2014-06-16 14:42  myFirstSwiftApp\calulator-alt3.png
     目录           0  2014-06-16 14:55  myFirstSwiftApp\myFirstSwiftApp\
     目录           0  2014-06-16 14:43  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\
     文件       16655  2014-06-16 14:43  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.pbxproj
     目录           0  2014-06-12 20:35  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.xcworkspace\
     文件         160  2014-06-12 20:35  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.xcworkspace\contents.xcworkspacedata
     目录           0  2014-06-12 20:35  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.xcworkspace\xcuserdata\
     目录           0  2014-06-16 14:45  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.xcworkspace\xcuserdata\luois.xcuserdatad\
     文件      116220  2014-06-16 14:45  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\project.xcworkspace\xcuserdata\luois.xcuserdatad\UserInterfaceState.xcuserstate
     目录           0  2014-06-12 20:35  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\
     目录           0  2014-06-12 20:54  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\
     目录           0  2014-06-13 17:41  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\xcdebugger\
     文件          91  2014-06-13 17:41  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\xcdebugger\Breakpoints_v2.xcbkptlist
     目录           0  2014-06-16 09:40  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\xcschemes\
     文件        3685  2014-06-16 09:40  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\xcschemes\myFirstSwiftApp.xcscheme
     文件         577  2014-06-12 20:35  myFirstSwiftApp\myFirstSwiftApp.xcodeproj\xcuserdata\luois.xcuserdatad\xcschemes\xcschememanagement.plist
     文件         171  2014-06-13 17:42  myFirstSwiftApp\myFirstSwiftApp\._AppDelegate.swift
     文件         213  2014-06-16 14:43  myFirstSwiftApp\myFirstSwiftApp\._Info.plist
     文件         171  2014-06-16 14:50  myFirstSwiftApp\myFirstSwiftApp\._ViewController.swift
     文件        2161  2014-06-13 17:42  myFirstSwiftApp\myFirstSwiftApp\AppDelegate.swift
     目录           0  2014-06-16 10:13  myFirstSwiftApp\myFirstSwiftApp\base.lproj\
     文件        1733  2014-06-16 10:13  myFirstSwiftApp\myFirstSwiftApp\base.lproj\Main.storyboard
     目录           0  2014-06-16 14:37  myFirstSwiftApp\myFirstSwiftApp\Images.xcassets\
............此处省略15个文件信息