IOS做一个简单计算器

////  ViewController.h//  TestCalculator4////  Created by heyonggang on 13-11-28.//  Copyright (c) 2013年 MiracleHe. All rights reserved.//#import <UIKit/UIKit.h>@interface ViewController : UIViewController@property(retain,nonatomic) UIButton *button;@property(retain,nonatomic) UILabel *label;@property(retain,nonatomic) NSMutableString *string;  //NSMutableString用来处理可变对象，如需要处理字符串并更改字符串中的字符@property(assign,nonatomic) double num1,num2;@property(assign,nonatomic) NSString *str;@end

////  ViewController.m//  TestCalculator4////  Created by heyonggang on 13-11-28.//  Copyright (c) 2013年 MiracleHe. All rights reserved.//#import "ViewController.h"#import <QuartzCore/QuartzCore.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];        //创建标签    self.label=[[UILabel alloc]initWithFrame:CGRectMake(90, 40, 200, 50)];    [self.view addSubview:_label];    self.label.backgroundColor=[UIColor greenColor];   //设置背景颜色    self.label.textColor=[UIColor blackColor];         //字体颜色    //self.label.textAlignment = UITextAlignmentRight; //字体居右    self.label.textAlignment = NSTextAlignmentCenter;    self.label.font=[UIFont systemFontOfSize:32.4];    //设置字体            //添加1-9数字    NSArray *array=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9", nil];    int n=0;    for (int i=0; i<3; i++)    {        for (int j=0; j<3; j++)        {            self.button=[UIButton buttonWithType:UIButtonTypeRoundedRect];            self.button.frame=CGRectMake(30+65*j, 150+65*i, 60, 60);            [self.button setTitle:[array objectAtIndex:n++] forState:UIControlStateNormal];   //注意：[array objectAtIndex:n++]            [self.view addSubview:_button];            [self.button addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside]; //addTarget:self 的意思是说，这个方法在本类中也可以传入其他类的指针        }    }            //单独添加0    UIButton *button0=[UIButton buttonWithType:UIButtonTypeCustom];  //创建一个圆角矩形的按钮/*    CALayer *layer = button0.layer;    [layer setMasksToBounds:YES];    [layer setCornerRadius:5.0];    button0.layer.borderColor = [UIColor lightGrayColor].CGColor;    button0.layer.borderWidth = 1.0f; */    [button0 setFrame:CGRectMake(30, 345, 60, 60)];                       //设置button在view上的位置    //也可以这样用：button0.frame:CGRectMake(30, 345, 60, 60);    [button0 setTitle:@"0" forState:UIControlStateNormal];                //设置button主题    button0.titleLabel.textColor = [UIColor blackColor];       //设置0键的颜色    [button0 addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside]; //按下按钮，并且当手指离开离开屏幕的时候触发这个事件                                                                                //触发了这个事件后，执行shuzi方法，action:@selector(shuzi:)    [self.view addSubview:button0];    //显示控件            //添加运算符    NSArray *array1=[NSArray arrayWithObjects:@"+",@"-",@"*",@"/",nil];    for (int i=0; i<4; i++)    {        UIButton *button1=[UIButton buttonWithType:UIButtonTypeRoundedRect];        [button1 setFrame:CGRectMake(225, 150+65*i, 60, 60)];        [button1 setTitle:[array1 objectAtIndex:i] forState:UIControlStateNormal];        //[array1 objectAtIndex:i]为获取按钮的属性值        [self.view addSubview:button1];        [button1 addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];    }        //添加=    UIButton *button2=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button2 setFrame:CGRectMake(160, 410, 125, 35)];    [button2 setTitle:@"=" forState:UIControlStateNormal];    [button2 addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button2];            //添加清除键    UIButton *button3=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button3 setFrame:CGRectMake(30, 410, 125, 35)];    [button3 setTitle:@"AC" forState:UIControlStateNormal];    [button3 addTarget:self action:@selector(clean:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button3];            //添加.    UIButton *button4=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button4 setFrame:CGRectMake(95, 345, 60, 60)];    [button4 setTitle:@"." forState:UIControlStateNormal];    [button4 addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button4];            //后退    UIButton *button5=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button5 setFrame:CGRectMake(160, 345, 60, 60)];    [button5 setTitle:@"back" forState:UIControlStateNormal];    [button5 addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button5];        self.string=[[NSMutableString alloc]init];//初始化可变字符串，分配内存    self.str = [[NSString alloc]init];    // Do any additional setup after loading the view, typically from a nib.}//0-9方法- (void)shuzi:(id)sender{        [self.string appendString:[sender currentTitle]];      //数字连续输入    self.label.text=[NSString stringWithString:_string];   //显示数值    self.num1=[self.label.text doubleValue];               //保存输入的数值    NSLog(@"self.num1  is  %f",self.num1);    }//计算方法-(void)go:(id)sender{    if ([self.str isEqualToString:@""])//当str里为空    {        self.num2=self.num1;        NSLog(@"self.num2  is  %f",self.num2);        self.label.text=[NSString stringWithString:_string];     //只要是符号就显示数值        [self.string setString:@""];                             //字符串清零        self.str=[sender currentTitle];                          //保存运算符为了作判断作何种运算        NSLog(@"%@",_str);        [self.string appendString:self.str];        self.label.text=[NSString stringWithString:_string];     //显示数值        [self.string setString:@""];          //字符串清零    }    else    {        //输出上次计算结果        if ([self.str isEqualToString:@"+"])//之前的符号是+        {            [self.string setString:@""];//字符串清零            self.num2+=self.num1;//num2是运算符号左边的数值，还是计算结果                        //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];   //字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }        }                else if ([self.str isEqualToString:@"-"])//之前的符号是-        {            [self.string setString:@""];//字符串清零            self.num2-=self.num1;            //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];//字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }        }                else if([self.str hasprefix:@"*"])//之前的符号是*   hasPrefix:方法的功能是判断创建的字符串内容是否以某个字符开始        {            [self.string setString:@""];//字符串清零            self.num2*=self.num1;            //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle] isEqualToString:@"="])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];          //字符串清零                self.str=[sender currentTitle];       //保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];  //在字符串后增加新的东西，［a appendString:]                [self.string setString:@""];          //字符串清零            }        }                else if ([self.str isEqualToString:@"/"])//之前的符号是/        {            [self.string setString:@""];//字符串清零            self.num2/=self.num1;            //判断输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];//字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }                    }    }}//当按下清除建时，所有数据清零-(void)clean:(id)sender{    [self.string setString:@""];//清空字符    self.num1=0;    self.num2=0;    self.label.text=@"0";//保证下次输入时清零    }//返回键-(void)back:(id)sender{    if (![self.label.text isEqualToString:@""])//判断不是空    {        [self.string deleteCharactersInRange:NSMakeRange         ([self.string length]-1,1)];//删除最后一个字符        self.label.text=[NSString stringWithString:_string];//显示结果    }}- (void)viewDidUnload{    [super viewDidUnload];    // Release any retained subviews of the main view.}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

////  ViewController.h//  TestCalculator4////  Created by heyonggang on 13-11-28.//  Copyright (c) 2013年 MiracleHe. All rights reserved.//#import <UIKit/UIKit.h>@interface ViewController : UIViewController@property(retain,nonatomic) UIButton *button;@property(retain,nonatomic) UILabel *label;@property(retain,nonatomic) NSMutableString *string;  //NSMutableString用来处理可变对象，如需要处理字符串并更改字符串中的字符@property(assign,nonatomic) double num1,num2;@property(assign,nonatomic) NSString *str;@end

////  ViewController.m//  TestCalculator4////  Created by heyonggang on 13-11-28.//  Copyright (c) 2013年 MiracleHe. All rights reserved.//#import "ViewController.h"#import <QuartzCore/QuartzCore.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];        //创建标签    self.label=[[UILabel alloc]initWithFrame:CGRectMake(90, 40, 200, 50)];    [self.view addSubview:_label];    self.label.backgroundColor=[UIColor greenColor];   //设置背景颜色    self.label.textColor=[UIColor blackColor];         //字体颜色    //self.label.textAlignment = UITextAlignmentRight; //字体居右    self.label.textAlignment = NSTextAlignmentCenter;    self.label.font=[UIFont systemFontOfSize:32.4];    //设置字体            //添加1-9数字    NSArray *array=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9", nil];    int n=0;    for (int i=0; i<3; i++)    {        for (int j=0; j<3; j++)        {            self.button=[UIButton buttonWithType:UIButtonTypeRoundedRect];            self.button.frame=CGRectMake(30+65*j, 150+65*i, 60, 60);            [self.button setTitle:[array objectAtIndex:n++] forState:UIControlStateNormal];   //注意：[array objectAtIndex:n++]            [self.view addSubview:_button];            [self.button addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside]; //addTarget:self 的意思是说，这个方法在本类中也可以传入其他类的指针        }    }            //单独添加0    UIButton *button0=[UIButton buttonWithType:UIButtonTypeCustom];  //创建一个圆角矩形的按钮/*    CALayer *layer = button0.layer;    [layer setMasksToBounds:YES];    [layer setCornerRadius:5.0];    button0.layer.borderColor = [UIColor lightGrayColor].CGColor;    button0.layer.borderWidth = 1.0f; */    [button0 setFrame:CGRectMake(30, 345, 60, 60)];                       //设置button在view上的位置    //也可以这样用：button0.frame:CGRectMake(30, 345, 60, 60);    [button0 setTitle:@"0" forState:UIControlStateNormal];                //设置button主题    button0.titleLabel.textColor = [UIColor blackColor];       //设置0键的颜色    [button0 addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside]; //按下按钮，并且当手指离开离开屏幕的时候触发这个事件                                                                                //触发了这个事件后，执行shuzi方法，action:@selector(shuzi:)    [self.view addSubview:button0];    //显示控件            //添加运算符    NSArray *array1=[NSArray arrayWithObjects:@"+",@"-",@"*",@"/",nil];    for (int i=0; i<4; i++)    {        UIButton *button1=[UIButton buttonWithType:UIButtonTypeRoundedRect];        [button1 setFrame:CGRectMake(225, 150+65*i, 60, 60)];        [button1 setTitle:[array1 objectAtIndex:i] forState:UIControlStateNormal];        //[array1 objectAtIndex:i]为获取按钮的属性值        [self.view addSubview:button1];        [button1 addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];    }        //添加=    UIButton *button2=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button2 setFrame:CGRectMake(160, 410, 125, 35)];    [button2 setTitle:@"=" forState:UIControlStateNormal];    [button2 addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button2];            //添加清除键    UIButton *button3=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button3 setFrame:CGRectMake(30, 410, 125, 35)];    [button3 setTitle:@"AC" forState:UIControlStateNormal];    [button3 addTarget:self action:@selector(clean:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button3];            //添加.    UIButton *button4=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button4 setFrame:CGRectMake(95, 345, 60, 60)];    [button4 setTitle:@"." forState:UIControlStateNormal];    [button4 addTarget:self action:@selector(shuzi:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button4];            //后退    UIButton *button5=[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button5 setFrame:CGRectMake(160, 345, 60, 60)];    [button5 setTitle:@"back" forState:UIControlStateNormal];    [button5 addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button5];        self.string=[[NSMutableString alloc]init];//初始化可变字符串，分配内存    self.str = [[NSString alloc]init];    // Do any additional setup after loading the view, typically from a nib.}//0-9方法- (void)shuzi:(id)sender{        [self.string appendString:[sender currentTitle]];      //数字连续输入    self.label.text=[NSString stringWithString:_string];   //显示数值    self.num1=[self.label.text doubleValue];               //保存输入的数值    NSLog(@"self.num1  is  %f",self.num1);    }//计算方法-(void)go:(id)sender{    if ([self.str isEqualToString:@""])//当str里为空    {        self.num2=self.num1;        NSLog(@"self.num2  is  %f",self.num2);        self.label.text=[NSString stringWithString:_string];     //只要是符号就显示数值        [self.string setString:@""];                             //字符串清零        self.str=[sender currentTitle];                          //保存运算符为了作判断作何种运算        NSLog(@"%@",_str);        [self.string appendString:self.str];        self.label.text=[NSString stringWithString:_string];     //显示数值        [self.string setString:@""];          //字符串清零    }    else    {        //输出上次计算结果        if ([self.str isEqualToString:@"+"])//之前的符号是+        {            [self.string setString:@""];//字符串清零            self.num2+=self.num1;//num2是运算符号左边的数值，还是计算结果                        //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];   //字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }        }                else if ([self.str isEqualToString:@"-"])//之前的符号是-        {            [self.string setString:@""];//字符串清零            self.num2-=self.num1;            //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];//字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }        }                else if([self.str hasPrefix:@"*"])//之前的符号是*   hasPrefix:方法的功能是判断创建的字符串内容是否以某个字符开始        {            [self.string setString:@""];//字符串清零            self.num2*=self.num1;            //输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle] isEqualToString:@"="])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2 is %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];          //字符串清零                self.str=[sender currentTitle];       //保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];  //在字符串后增加新的东西，［a appendString:]                [self.string setString:@""];          //字符串清零            }        }                else if ([self.str isEqualToString:@"/"])//之前的符号是/        {            [self.string setString:@""];//字符串清零            self.num2/=self.num1;            //判断输出上次结果后判断这次输入的是何符号            if ([[sender currentTitle]isEqualToString:@"="])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                self.str=@"";            }            else if ([[sender currentTitle]isEqualToString:@"+"]||[[sender currentTitle]isEqualToString:@"-"]||[[sender currentTitle]isEqualToString:@"*"]||[[sender currentTitle]isEqualToString:@"/"])            {                NSLog(@"self.num2  is  %f",self.num2);                self.label.text=[NSString stringWithFormat:@"%f",self.num2];                [self.string setString:@""];//字符串清零                self.str=[sender currentTitle];//保存运算符为了作判断作何种运算                NSLog(@"%@",_str);                [self.string appendString:self.str];                [self.string setString:@""];//字符串清零            }                    }    }}//当按下清除建时，所有数据清零-(void)clean:(id)sender{    [self.string setString:@""];//清空字符    self.num1=0;    self.num2=0;    self.label.text=@"0";//保证下次输入时清零    }//返回键-(void)back:(id)sender{    if (![self.label.text isEqualToString:@""])//判断不是空    {        [self.string deleteCharactersInRange:NSMakeRange         ([self.string length]-1,1)];//删除最后一个字符        self.label.text=[NSString stringWithString:_string];//显示结果    }}- (void)viewDidUnload{    [super viewDidUnload];    // Release any retained subviews of the main view.}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end