iOS小型计算器

//

//  ViewController.m

//  计算器

//屏幕的宽和高

#define SCREEN_W self.view.frame.size.width

#define SCREEN_H self.view.frame.size.height

#import "ViewController.h"

@interface ViewController ()

//用于存储输入的第一个数字

@property (nonatomic,assign) CGFloat num1;

//用于存储输入的第二个数字

@property (nonatomic,assign) CGFloat num2;

//用于存储最终结果

@property (nonatomic,assign)  CGFloat numResult;

//用于判断符号的标记

@property (nonatomic,assign) NSInteger tag;

//显示屏

@property (nonatomic,strong) UILabel *screen;

//

@property (nonatomic,strong) NSMutableString *str;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//开辟空间

_str = [[NSMutableString alloc]init];

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

#pragma mark - screen

//先创建一个标签，用于显示

_screen = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, SCREEN_W, SCREEN_H-400-5*10)];

//设置屏幕的字体颜色

[_screen setTextColor:[UIColor whiteColor]];

//设置屏幕的背景颜色

_screen.backgroundColor = [UIColor blackColor];

//设置屏幕的字体大小

_screen.font = [UIFont systemFontOfSize:40];

//设置屏幕的字体自适应

_screen.adjustsFontSizeToFitWidth = YES;

//设置字体的对齐方式

_screen.textAlignment = NSTextAlignmentRight;

//清零

_screen.text = [NSMutableString stringWithString:@"0"];

[self.view addSubview:_screen];

#pragma mark - buttonwith+_*/

NSArray *signArr = @[@"÷",@"x",@"-",@"+"];

for (int i = 0; i < [signArr count]; i++) {

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

//设置按钮的文字

[btn setTitle:signArr[i] forState:UIControlStateNormal];

//设置按钮的位置和大小

btn.frame = CGRectMake(((SCREEN_W-30)/4.0)*3.0+30, _screen.frame.size.height+90*(i%4)+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

btn.backgroundColor = [UIColor orangeColor];

//设置按钮字体的大小

btn.titleLabel.font = [UIFont systemFontOfSize:40];

//给每个按钮添加事件

[btn addTarget:self action:@selector(calculate:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn];

}

#pragma mark - 单独添加“＝”

UIButton *goBtn = [UIButton buttonWithType:UIButtonTypeSystem];

//设置按钮的大小和位置

goBtn.frame = CGRectMake(((SCREEN_W-30)/4.0)*3.0+30, _screen.frame.size.height+90*4+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

goBtn.backgroundColor = [UIColor orangeColor];

//设置按钮的文字

[goBtn setTitle:@"=" forState:UIControlStateNormal];

//设置文字的大小

goBtn.titleLabel.font = [UIFont systemFontOfSize:40];

//为每个按钮添加事件

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

[self.view addSubview:goBtn];

#pragma mark - number

NSArray *numArr = @[@"7",@"8",@"9",@"4",@"5",@"6",@"1",@"2",@"3"];

for (int i = 0 ; i < [numArr count]; i++) {

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

btn.frame = CGRectMake(((SCREEN_W-30)/4.0+10)*(i%3), _screen.frame.size.height+90*(i/3)+90+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

btn.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[btn setTitle:numArr[i] forState:UIControlStateNormal];

//设置文字的大小

btn.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

[btn addTarget:self action:@selector(expressNum:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn];

}

#pragma mark - 添加清除键

UIButton *cleanBtn = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

cleanBtn.frame = CGRectMake(0, _screen.frame.size.height+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

cleanBtn.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[cleanBtn setTitle:@"AC" forState:UIControlStateNormal];

//设置文字的大小

cleanBtn.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[cleanBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

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

[self.view addSubview:cleanBtn];

#pragma mark - 单独添加0

UIButton *btn0 = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

btn0.frame = CGRectMake(0, SCREEN_H - 80, (SCREEN_W-30)/4.0*2+10, 80);

//设置按钮的背景颜色

btn0.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[btn0 setTitle:@"0" forState:UIControlStateNormal];

//设置文字的大小

btn0.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[btn0 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

[btn0 addTarget:self action:@selector(expressNum:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn0];

#pragma mark - 单独添加百分号%

UIButton *btnPrecent = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

btnPrecent.frame = CGRectMake(((SCREEN_W-30)/4.0+10)*2, _screen.frame.size.height+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

btnPrecent.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[btnPrecent setTitle:@"%" forState:UIControlStateNormal];

//设置文字的大小

btnPrecent.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[btnPrecent setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

[btnPrecent addTarget:self action:@selector(precent:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btnPrecent];

#pragma mark - 单独添加点"."

UIButton *btnPoint = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

btnPoint.frame = CGRectMake(btn0.frame.size.width+10, SCREEN_H-80, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

btnPoint.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[btnPoint setTitle:@"." forState:UIControlStateNormal];

//设置文字的大小

btnPoint.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[btnPoint setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

[btnPoint addTarget:self action:@selector(expressNum:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btnPoint];

#pragma mark - 单独添加点"+/-"

UIButton *btnSign = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的大小和位置

btnSign.frame = CGRectMake(cleanBtn.frame.size.width+10, _screen.frame.size.height+10, (SCREEN_W-30)/4.0, 80);

//设置按钮的背景颜色

btnSign.backgroundColor = [UIColor lightGrayColor];

//设置按钮的文字

[btnSign setTitle:@"+/-" forState:UIControlStateNormal];

//设置文字的大小

btnSign.titleLabel.font = [UIFont systemFontOfSize:40];

//设置文字的颜色

[btnSign setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

//为每个按钮添加事件

[btnSign addTarget:self action:@selector(signNum:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btnSign];

}

-(void) expressNum:(UIButton *)sender

{

//先判断首字母是不是符号

if ([_str hasPrefix:@"+"]||[_str hasPrefix:@"-"]||[_str hasPrefix:@"x"]||[_str hasPrefix:@"÷"]) {

//如果是，就清零

_str = [NSMutableString stringWithString:@""];

}

//连续追加数字

[_str appendString:sender.currentTitle];

_screen.text = [NSString stringWithString:_str];

//将输入的第一个数字保存在num1中

_num1 = [_screen.text doubleValue];

//用于调试

//NSLog(@"-----%ld",_num1);

}

//判断符号

-(void)calculate:(UIButton *)sender

{

//先清零

_str = [NSMutableString stringWithString:@""];

//再重新追加符号

[_str appendString:sender.currentTitle];

//显示（这个可写可不写）

_screen.text = [NSString stringWithString:_str];

if ([_str hasPrefix:@"+"]) {

_num2 = _num1;

_tag = 1;

}else if ([_str hasPrefix:@"-"]){

_num2 = _num1;

_tag = 2;

}else if ([_str hasPrefix:@"x"]) {

_num2 = _num1;

_tag = 3;

}else if ([_str hasPrefix:@"÷"]) {

_num2 = _num1;

_tag = 4;

}

}

//计算结果

-(void)go:(UIButton *)sender

{

switch (_tag) {

case 1:

_numResult = _num2 + _num1;

break;

case 2:

_numResult = _num2 - _num1;

break;

case 3:

_numResult = _num2 * _num1;

break;

case 4:

_numResult = _num2 / _num1;

break;

}

_screen.text = [NSString stringWithFormat:@"%lg",_numResult];

_num1 = _numResult;

}

//清除

-(void)clean:(UIButton *)sender

{

_str = [NSMutableString stringWithString:@""];

_screen.text = @"0";

_num1 = 0;

_num2 = 0;

_numResult = 0;

}

//百分号

-(void)precent:(UIButton *)sender

{

_num1 = _num1 * 0.01;

//注意，这里要以最简形式（占用宽度最小）输出，并且不会输出无意义的0

_screen.text = [NSString stringWithFormat:@"%lg",_num1];

}

//正负号

-(void)signNum:(UIButton *)sender

{

//先判断数字是否大于0,如果是，就变负

if (_num1 >= 0) {

//添加负号

[_str insertString:@"-" atIndex:0];

_num1 = [_str doubleValue];

_screen.text = [NSString stringWithFormat:@"%lg",_num1];

}

//如果数字小于0,那么变为正数

else if (_num1 < 0)

{

//删除负号

[_str deleteCharactersInRange:NSMakeRange(0, 1)];

_num1 = [_str doubleValue];

_screen.text = [NSString stringWithFormat:@"%lg",_num1];

}

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

//大家看了之后觉得哪里代码可以更加优化，或者功能上有什么补充的，麻烦评论下，感谢了