IOS小型计算器实例代码2

男娘i 2022-09-18 12:48 156阅读 0赞

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## IOS小型计算器实例代码2 ##

原文链接：[http://blog.sina.com.cn/s/blog\_bf9843bf0101fca3.html][http_blog.sina.com.cn_s_blog_bf9843bf0101fca3.html]

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

[http_blog.sina.com.cn_s_blog_bf9843bf0101fca3.html]: http://blog.sina.com.cn/s/blog_bf9843bf0101fca3.html