IOS小型计算器实例代码

#import

@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,num4;

@end

4.ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesizebutton,label,string,num1,num2,num3,num4;//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，num4是判断进行何种运算

- (void)viewDidLoad

{

[superviewDidLoad];

//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.viewsetBackgroundColor:[UIColor colorWithPatternImage:img]];//UIColorcolorWithPatternImage: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:nilcancelButtonTitle:@"OK" otherButtonTitles:nil];

[alexshow];

[alexrelease];

//创建标签

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

[self.viewaddSubview: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=[NSArrayarrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",nil];

intn=0;

for (inti=0; i<3; i++)

{

for (int j=0; j<3; j++)

{

self.button=[UIButtonbuttonWithType: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];

[button0setFrame:CGRectMake(30, 345, 60, 60)];

[button0setTitle:@"0" forState:UIControlStateNormal];

[button0addTarget:self action:@selector(one:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button0];

//添加运算符

NSArray*array1=[NSArray arrayWithObjects:@"+",@"-",@"*",@"/",nil];

for (inti=0; i<4; i++)

{

UIButton *button1=[UIButtonbuttonWithType: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];

[button2setFrame:CGRectMake(160, 410, 125, 35)];

[button2setTitle:@"=" forState:UIControlStateNormal];

[button2addTarget:self action:@selector(go:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button2];

//添加清除键

UIButton*button3=[UIButton buttonWithType:UIButtonTypeRoundedRect];

[button3setFrame:CGRectMake(30, 410, 125, 35)];

[button3setTitle:@"AC" forState:UIControlStateNormal];

[button3addTarget:self action:@selector(clean:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button3];

//添加.

UIButton*button4=[UIButton buttonWithType:UIButtonTypeRoundedRect];

[button4setFrame:CGRectMake(95, 345, 60, 60)];

[button4setTitle:@"." forState:UIControlStateNormal];

[button4addTarget:self action:@selector(one:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button4];

//后退

UIButton*button5=[UIButton buttonWithType:UIButtonTypeRoundedRect];

[button5setFrame:CGRectMake(160, 345, 60, 60)];

[button5setTitle:@"back" forState:UIControlStateNormal];

[button5addTarget:self action:@selector(back:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button5];

self.string=[[NSMutableString alloc]init];//初始化可变字符串，分配内存

// Do anyadditional setup after loading the view, typically from anib.

}

-(void)one:(id)sender

{

//保证是符号时在输入数字时隐藏

if([self.string hasPrefix:@"+"]||[self.stringhasPrefix:@"-"]||[self.string hasPrefix:@"*"]||[self.stringhasPrefix:@"/"])//判断是否为运算符

{

[self.string setString:@""];//字符串清零

}

[self.stringappendString:[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.stringsetString:@""];//字符串清零

[self.stringappendString:[sender currentTitle]];

self.label.text=[NSString stringWithString:string];

//判断输入是+号

if([self.string hasPrefix:@"+"])//hasPrefix:判断字符串以加号开头

{

self.num2=self.num1;//将前面的数值保存在num2里

self.num4=1;

}

//判断输入是-号

elseif([self.string hasPrefix:@"-"])//hasPrefix:判断字符串以减号开头

{

self.num2=self.num1;

self.num4=2;

}

//判断输入是*号

elseif([self.string hasPrefix:@"*"])//hasPrefix:判断字符串以乘号开头

{

self.num2=self.num1;

self.num4=3;

}

//判断输入是/号

elseif([self.string hasPrefix:@"/"])//hasPrefix:判断字符串以除号开头

{

self.num2=self.num1;

self.num4=4;

}

}

-(void)go:(id)sender

{

//判断输入是+号

if(self.num4==1)

{

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

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

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

self.num3=0;

[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

elseif(self.num4==2)

{

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

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

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

self.num3=0;

[self.string setString:@""];

}

//判断输入是*号

elseif(self.num4==3)

{

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

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

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

self.num3=0;

[self.string setString:@""];

}

//判断输入是/号

elseif(self.num4==4)

{

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

self.label.text=[NSStringstringWithFormat:@"%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.num3=0;

[self.string setString:@""];

}

}

//当按下清除建时，所有数据清零

-(void)clean:(id)sender{

[self.stringsetString:@""];//清空字符串

self.num3=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

{

[superviewDidUnload];

// Releaseany retained subviews of the main view.

}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return(interfaceOrientation !=UIInterfaceOrientationPortraitUpsideDown);

}

@end