基于UI写的简单的计算器

刺骨的言语ヽ痛彻心扉 2022-08-11 08:58 155阅读 0赞

</pre><span style="font-size:24px;"></span><div style="text-align: center;">主要代码</div><div style="text-align: left;">.h文件</div><div style="text-align: left;"><pre name="code" class="cpp">#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,num4;
    @end

.m文件

#import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    @synthesize button,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
    {
        [super viewDidLoad];
        
        //设置背景图片
        NSBundle *bundle=[NSBundle mainBundle];
        NSData *data=[[NSData alloc]initWithContentsOfFile:
                      [bundle pathForResource:@"3" 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
        
        //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 =  NSTextAlignmentRight;;//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.backgroundColor = [UIColor whiteColor];
                [self.button setTitle:[array objectAtIndex:n++] forState:UIControlStateNormal];
                self.button.titleLabel.font = [UIFont systemFontOfSize:30];
                self.button.layer.cornerRadius = 6;
                [self.view addSubview:button];
                [self.button setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
                [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.layer.cornerRadius = 6;
        button0.backgroundColor = [UIColor whiteColor];
        [button0 setTitle:@"0" forState:UIControlStateNormal];
        button0.titleLabel.font = [UIFont systemFontOfSize:30];
        [button0 setTitleColor:[UIColor orangeColor] 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.backgroundColor = [UIColor whiteColor];
            button1.layer.cornerRadius = 6;
            [button1 setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
            [button1 setTitle:[array1 objectAtIndex:i] forState:UIControlStateNormal];
            [self.view addSubview:button1];
            button1.titleLabel.font = [UIFont systemFontOfSize:30];
            [button1 addTarget:self action:@selector(two:) forControlEvents:UIControlEventTouchUpInside];
        }
        
        //添加=
        
        UIButton *button2=[UIButton buttonWithType:UIButtonTypeRoundedRect];
        button2.backgroundColor = [UIColor whiteColor];
        [button2 setFrame:CGRectMake(160, 410, 125, 35)];
        [button2 setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
        button2.titleLabel.font = [UIFont systemFontOfSize:30];
        [button2 setTitle:@"=" forState:UIControlStateNormal];
        button2.layer.cornerRadius = 6;
        [button2 addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button2];
        
        //添加清除键
        
        UIButton *button3=[UIButton buttonWithType:UIButtonTypeRoundedRect];
        button3.backgroundColor = [UIColor whiteColor];
        [button3 setFrame:CGRectMake(30, 410, 125, 35)];
        button3.layer.cornerRadius = 6;
        [button3 setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
        [button3 setTitle:@"AC" forState:UIControlStateNormal];
        button3.titleLabel.font = [UIFont systemFontOfSize:20];
        [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.titleLabel.font = [UIFont systemFontOfSize:30];
        button4.layer.cornerRadius = 6;
        [button4 setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
        button4.backgroundColor = [UIColor whiteColor];
        [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.backgroundColor = [UIColor whiteColor];
        button5.layer.cornerRadius = 6;
        [button5 setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
        button5.titleLabel.font = [UIFont systemFontOfSize:20];
        [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
    {
        //保证是符号时在输入数字时隐藏
        if ([self.string hasPrefix:@"+"]||[self.string hasPrefix:@"-"]||[self.string hasPrefix:@"*"]||[self.string hasPrefix:@"/"])//判断是否为运算符
        {
            [self.string setString:@""];//字符串清零
        }
        [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.string setString:@""];//字符串清零
        [self.string appendString:[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
        else if([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
        else if([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
        else if([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.text doubleValue];//[self.label.text doubleValue]是每次后输入的数字
            self.label.text=[NSString stringWithFormat:@"%g",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
        else if(self.num4==2)
        {
            self.num3=self.num2-[self.label.text doubleValue];
            self.label.text=[NSString stringWithFormat:@"%g",self.num3];
            self.num1=[self.label.text doubleValue];
            self.num3=0;
            [self.string setString:@""];
        }
        //判断输入是*号
        else if(self.num4==3)
        {
            self.num3=self.num2*[self.label.text doubleValue];
            self.label.text=[NSString stringWithFormat:@"%g",self.num3];
            self.num1=[self.label.text doubleValue];
            self.num3=0;
            [self.string setString:@""];
        }
        //判断输入是/号
        else if(self.num4 == 4)
        {
            self.num3=self.num2/[self.label.text doubleValue];
            self.label.text=[NSString stringWithFormat:@"%g",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.string setString:@""];//清空字符串
        self.num3=0;
        self.num2 = 0;
        self.label.text=@"";//保证下次输入时清零
        
    }
    //返回键
    -(void)back:(id)sender
    {
        if ([self.label.text length] > 0) {
            self.label.text = [self.label.text substringToIndex:[self.label.text length] - 1];
        }
    }
    
    - (void)viewDidUnload
    {
        [super viewDidUnload];
        // Release any retained subviews of the main view.
    }
    
    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    }
    
    @end

运行效果:

![Image 1][]

[Image 1]: