IOS小型计算器实例代码2


对以前的代码进行了修改，方法更简洁一些

步骤：
1.打开Xcode，单机Creat a new Xcode project
2.左边选择ios下Application,右边选择single view Application

3.填写项目名称单机Next

4.ViewController.h中定义成员和方法

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property(retain,nonatomic)UIButton *button;

@property(retain,nonatomic)UILabel *label;

@property(retain,nonatomic)NSMutableString *string;

@property(assign,nonatomic)double num1,num2,num3;

@property(assign,nonatomic)NSString*str;

@end

5.ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize button,label,string,num1,num2,num3,str;//string保存字符，显示数值。num1是存输入的数值，num2是存运算符前的数值，num3是运算结果，str是判断进行何种运算

- (void)viewDidLoad

{

[super viewDidLoad];

//设置背景图片

NSBundle *bundle=[NSBundle mainBundle];

NSData *data=[[NSData alloc]initWithContentsOfFile:

[bundle pathForResource:@"1" ofType:@"jpg"]];//找到NSBundle的某一资源

UIImage *img=[UIImage imageWithData:data];//创建了可用的图像对象

[self.view setBackgroundColor:[UIColor colorWithPatternImage:img]];//UIColor colorWithPatternImage:方法是把图片转化为color类型 将背景换做提供的图片

//添加提示性文字

UIAlertView *alex=[[UIAlertView alloc]initWithTitle:@"使用说明" message:@"只支持两数的计算以及在此基础上的计算，不支持连算。" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

[alex show];

[alex release];

//创建标签

self.label=[[UILabel alloc]initWithFrame:CGRectMake(90, 40, 200, 50)];

[self.view addSubview:label];

self.label.backgroundColor=[UIColor clearColor];//清空背景颜色

self.label.textColor=[UIColor blueColor];//字体颜色

self.label.textAlignment=UITextAlignmentRight;//字体居右

self.label.font=[UIFont systemFontOfSize:32.4];

//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];

[self.view addSubview:button];

[self.button addTarget:self action:@selector(one:) forControlEvents:UIControlEventTouchUpInside];

}

}

//单独添加0

UIButton *button0=[UIButton buttonWithType:UIButtonTypeRoundedRect];

[button0 setFrame:CGRectMake(30, 345, 60, 60)];

[button0 setTitle:@"0" forState:UIControlStateNormal];

[button0 addTarget:self action:@selector(one:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button0];

//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];

[self.view addSubview:button1];

[button1 addTarget:self action:@selector(two:) 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(one:) 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

// Do any additional setup after loading the view, typically from a nib.

}

-(void)one:(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(@"%f",self.num1);

}

-(void)two:(id)sender

{

self.num2=self.num1;//将输入的数值保存在num2中，num2是运算符号左边的数值

[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

[self.string appendString:self.str];

self.label.text=[NSString stringWithString:string];//显示数值

[self.string setString:@""];//字符串清零

}

-(void)go:(id)sender

{

//判断输入是+号

if ([self.str hasPrefix:@"+"])

{

self.num3=self.num2+[self.label.text doubleValue];//[self.label.text doubleValue]是每次后输入的数字

self.label.text=[NSString stringWithFormat:@"%f",self.num3];//显示结果

self.num1=[self.label.text doubleValue];//为了可以不按AC连加。保存结果

[self.string setString:@""];//保证每次结果正确输出后，再次计算，不用按清除键

}

//判断输入是-号

else if([self.str hasPrefix:@"-"])

{

self.num3=self.num2-[self.label.text doubleValue];

self.label.text=[NSString stringWithFormat:@"%f",self.num3];

self.num1=[self.label.text doubleValue];

[self.string setString:@""];

}

//判断输入是*号

else if([self.str hasPrefix:@"*"])

{

self.num3=self.num2*[self.label.text doubleValue];

self.label.text=[NSString stringWithFormat:@"%f",self.num3];

self.num1=[self.label.text doubleValue];

[self.string setString:@""];

}

//判断输入是/号

else if([self.str hasPrefix:@"/"])

{

self.num3=self.num2/[self.label.text doubleValue];

self.label.text=[NSString stringWithFormat:@"%f",self.num3];//计算结果显示出来

self.num1=[self.label.text doubleValue];//把计算的结果保存一下

[self.string setString:@""];

}

}

//当按下清除建时，所有数据清零

-(void)clean:(id)sender{

[self.string setString:@""];//清空字符串

self.num3=0;

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);

}

@end