这篇博客介绍了如何使用纯代码在iOS平台上实现一个简单的计算器应用。通过创建`CaculatorBrain`类来封装计算逻辑，包括加减乘除以及清零等功能，并在`MxlJisuanqiViewController`中实现用户界面交互。计算器界面包含数字、运算符和清除键，并能处理连续运算和等于号的点击事件。
把 计算器里的方法 封装一个类
#import <Foundation/Foundation.h>
@interface CaculatorBrain : NSObject
- (void)pushOperation:(NSString *)operation;
- (double)result:(BOOL)secondEq;
- (void)zero;
- (void)pushNumberInStack:(double)aDouble andBool:(BOOL)aBool;
@end
#import "CaculatorBrain.h"
@class MxlJisuanqiViewController;
@interface CaculatorBrain()
@property (strong,nonatomic)NSMutableArray *operandStack;
@property (assign,nonatomic)unichar symbol;
@property (weak,nonatomic)MxlJisuanqiViewController *controller;
@property (assign,nonatomic)double secondNumber;
@end
@implementation CaculatorBrain
- (NSMutableArray *)operandStack
{
if (!_operandStack) {
_operandStack = [NSMutableArray arrayWithCapacity:3];
}
return _operandStack;
}
- (double)outANumber
{
double number = [[self.operandStack lastObject]doubleValue];
if ([self.operandStack lastObject]){
[self.operandStack removeLastObject];
}
return number;
}
- (double)result:(BOOL)secondEq
{
NSString *opera = [NSString stringWithFormat:@"%c",self.symbol];
if (!secondEq){
if ([self.operandStack count] >1 ){
double number2 = [self outANumber];
double number1 = [self outANumber];
double result = 0;
if ([opera isEqualToString:@"+"]) result = number1 + number2;
else if ([@"-" isEqualToString:opera]) result = number1 - number2;
else if ([opera isEqualToString:@"×"]) result = number1 * number2;
else if ([opera isEqualToString:@"÷"])
{
if (number2 == 0) {
}else
{
result = number1 / number2;
}
}else if ([opera isEqualToString:@""])
{
return result = number1;
}
return result;
}
else
{
[self zero];
return 0;
}
}else {
double number = [self outANumber];
double result = 0;
if ([opera isEqualToString:@"+"]) result = number + self.secondNumber;
else if ([@"-" isEqualToString:opera]) result = number - self.secondNumber;
else if ([opera isEqualToString:@"×"]) result = number * self.secondNumber;
else if ([opera isEqualToString:@"÷"])
{
if (self.secondNumber == 0) {
}else
{
result = number / self.secondNumber;
}
}
return result;
}
}
- (void)zero {
[self.operandStack removeAllObjects];
}
- (void)pushNumberInStack:(double)aDouble andBool:(BOOL)aBool {
double number = aDouble;
NSNumber *operand = [NSNumber numberWithDouble:number];
[self.operandStack addObject:operand];
if(!aBool) {
self.secondNumber = [[self.operandStack lastObject]doubleValue];}
}
- (void)pushOperation:(NSString *)operati
{
self.symbol = [operati characterAtIndex:0];
}
@end
在计算器界面里
在.h 文件里
#import <UIKit/UIKit.h>
@interface MxlJisuanqiViewController : UIViewController
@property (nonatomic,retain)NSString *disStr;
@end
#import "MxlJisuanqiViewController.h"
#import "CaculatorBrain.h"
@interface MxlJisuanqiViewController ()
@property (nonatomic, retain) UILabel *display;
@property BOOL isUseInEnteringANumber;
@property (nonatomic)CaculatorBrain *brain;
@property BOOL isContinue;
@property BOOL secondEqual;
@property BOOL firstEqual;
@property (nonatomic,retain)NSUserDefaults*userDefaults;
@end
@implementation MxlJisuanqiViewController
@synthesize userDefaults;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
userDefaults = [NSUserDefaults standardUserDefaults];
}
return self;
}
- (CaculatorBrain *)brain
{
if (!_brain) {
_brain = [CaculatorBrain new];
}
return _brain;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *familyNames =[[NSArray alloc]initWithArray:[UIFont familyNames]];
NSArray *fontNames;
NSInteger indFamily, indFont;
NSLog(@"[familyNames count]===%d",[familyNames count]);
for(indFamily=0;indFamily<[familyNames count];++indFamily)
{
NSLog(@"Family name: %@", [familyNames objectAtIndex:indFamily]);
fontNames =[[NSArray alloc]initWithArray:[UIFont fontNamesForFamilyName:[familyNames objectAtIndex:indFamily]]];
for(indFont=0; indFont<[fontNames count]; ++indFont)
{
NSLog(@"Font name: %@",[fontNames objectAtIndex:indFont]);
}
}
// titleView的label
UILabel *titleLab = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 30)];
titleLab.text = @"计算器";
titleLab.font = [UIFont fontWithName:@"Helvetica-Bold" size:18];
titleLab.textColor = [UIColor whiteColor];
titleLab.textAlignment = NSTextAlignmentCenter;
self.navigationItem.titleView = titleLab;
self.display = [[UILabel alloc]initWithFrame:CGRectMake(0, 64, 320, 92)];
self.display.font = [UIFont systemFontOfSize:40.0f];
self.display.textAlignment = NSTextAlignmentRight;
self.display.text = self.disStr;
// self.display.text = [userDefaults objectForKey:@"tf2"];
NSLog(@"%@",self.display.text);
self.display.backgroundColor = [UIColor colorWithRed:236/255. green:236/255. blue:236/255. alpha:1];
[self.view addSubview:self.display];
NSArray *shuziArr = @[@"AC",@"-",@"+",@"7",@"8",@"9",@"4",@"5",@"6",@"1",@"2",@"3",@"0",@".",@"00"];
for(int i=0; i<5; i++) {
for(int j=0; j<3; j++) {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if (isPhone5) {
btn.frame = CGRectMake(80*j, 156+83*i, 80, 83);
}else
{
btn.frame = CGRectMake(80*j, 156+65*i, 80, 65);
}
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
if (i ==0 ) {
if (j ==0) {
[btn addTarget:self action:@selector(zeroPressed:) forControlEvents:UIControlEventTouchUpInside];
}else
{
[btn addTarget:self action:@selector(operationPressed:) forControlEvents:UIControlEventTouchUpInside];
}
btn.backgroundColor = [UIColor colorWithRed:120/255. green:193/255. blue:42/255. alpha:0.76];
// btn.backgroundColor = [UIColor lightGrayColor];
}else
{
btn.backgroundColor = [UIColor colorWithRed:236/255. green:236/255. blue:236/255. alpha:1];
[btn addTarget:self action:@selector(digitPressed:) forControlEvents:UIControlEventTouchUpInside];
}
btn.titleLabel.font= [UIFont fontWithName:@"HelveticaNeue-Thin" size:25.0];
// btn.titleLabel.font = [UIFont systemFontOfSize:25.0f];
[btn setTitle:[shuziArr objectAtIndex:3*i+j] forState:UIControlStateNormal];
// [btn setTitleShadowColor:[UIColor redColor] forState:UIControlStateSelected];
btn.tag = 3*i+j;
[self.view addSubview:btn];
}
}
NSArray *yunsuanArr =@[@"÷",@"×",@"=",@"OK"];
for (int i = 0; i<4; i++) {
UIButton *buttons = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if (i ==3) {
if (isPhone5) {
buttons.frame = CGRectMake(240, 156+83*i, 80, 166);
}else
{
buttons.frame = CGRectMake(240, 156+65*i, 80, 130);
}
[buttons addTarget:self action:@selector(okBtn:) forControlEvents:UIControlEventTouchUpInside];
buttons.backgroundColor = [UIColor colorWithRed:120/255. green:193/255. blue:42/255. alpha:0.76];
// buttons.backgroundColor = [UIColor lightGrayColor];
}else if(i ==2)
{
if (isPhone5) {
buttons.frame = CGRectMake(240, 156+83*i, 80, 83);
}else
{
buttons.frame = CGRectMake(240, 156+65*i, 80, 65);
}
[buttons addTarget:self action:@selector(equalR) forControlEvents:UIControlEventTouchUpInside];
buttons.backgroundColor =[UIColor colorWithRed:120/255. green:193/255. blue:42/255. alpha:0.76];
// buttons.backgroundColor = [UIColor lightGrayColor];
// [buttons setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
// buttons.titleLabel.font = [UIFont fontWithName:@"Copperplate" size:25];
// [buttons setTitle:[yunsuanArr objectAtIndex:i] forState:UIControlStateNormal];
}
else
{
if (isPhone5) {
buttons.frame = CGRectMake(240, 156+83*i, 80, 83);
}else
{
buttons.frame = CGRectMake(240, 156+65*i, 80, 65);
}
buttons.backgroundColor = [UIColor colorWithRed:120/255. green:193/255. blue:42/255. alpha:0.76];
// buttons.backgroundColor = [UIColor lightGrayColor];
[buttons addTarget:self action:@selector(operationPressed:) forControlEvents:UIControlEventTouchUpInside];
}
[buttons setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
buttons.titleLabel.font = [UIFont fontWithName:@"HelveticaNeue-Thin" size:25.0];
// buttons.titleLabel.font = [UIFont systemFontOfSize:25.0f];
[buttons setTitle:[yunsuanArr objectAtIndex:i] forState:UIControlStateNormal];
[self.view addSubview:buttons];
}
for (int i = 0; i<5; i++) {
UIImageView *imageview = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"divider1.png"]];
if (i ==4) {
if (isPhone5) {
imageview.frame = CGRectMake(0, 155.6+83*i, 240, 1.1);
}else
{
imageview.frame = CGRectMake(0, 155.6+65*i, 240, 1.1);
}
}else
{
if (isPhone5) {
imageview.frame = CGRectMake(0, 155.6+83*i, 320, 1.1);
}else
{
imageview.frame = CGRectMake(0, 155.6+65*i, 320, 1.1);
}
}
[self.view addSubview:imageview];
}
for (int i = 0; i<3; i++) {
UIView *lineView = [[UIView alloc] init ];
if (i ==1) {
if (isPhone5) {
lineView.frame =CGRectMake(80*i+80, 156.0f, 0.60f, 415.0f);
}else
{
lineView.frame =CGRectMake(80*i+80, 156.0f, 0.60f, 330.0f);
}
}else
if (isPhone5) {
lineView.frame =CGRectMake(80*i+80, 156.0f, 0.60f, 415.0f);
}else
{
lineView.frame =CGRectMake(80*i+80, 156.0f, 0.60f, 330.0f);
} [lineView setBackgroundColor:[UIColor lightGrayColor]];
[self.view addSubview:lineView];
}
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
self.navigationItem.hidesBackButton = YES;
}
-(void)viewWillDisappear:(BOOL)animated
{
self.display.text = @"";
}
／／ 点击操作符号
-(void)operationPressed:(UIButton*)sender
{
self.firstEqual = YES;
_secondEqual = NO;
if(_isContinue) [self equalR];
[self.brain pushOperation:sender.currentTitle];
[self numberInBrain];
_isContinue = YES;
}
- (void)numberInBrain
{
_isUseInEnteringANumber = NO;
[self.brain pushNumberInStack:[self.display.text doubleValue] andBool:self.secondEqual];
}
／／ 清空
-(void)zeroPressed:(id)sender
{
self.display.text = @"0";
[self.brain zero];
_isContinue = NO;
_isUseInEnteringANumber = NO;
[self.brain pushNumberInStack:0.0 andBool:NO];
self.secondEqual = NO;
self.firstEqual = NO;
}
／／ 点击数字按钮
-(void)digitPressed:(UIButton*)sender
{
_secondEqual = NO;
NSString *digit = sender.currentTitle;
if (_isUseInEnteringANumber == YES)
{
self.display.text = [self.display.text stringByAppendingString:digit];
}
else {
if ([digit isEqualToString:@"0"]) {
self.display.text = @"0";
_isUseInEnteringANumber = NO;
}else if ([digit isEqualToString:@"."])
{
self.display.text = @"0.";
_isUseInEnteringANumber = YES;
}
else
{
self.display.text = digit;
_isUseInEnteringANumber = YES;
}
}
NSLog(@"%@",digit);
}
／／ 点击等号
-(void)equalR
{
if (self.firstEqual) {
_isContinue = NO;
[self numberInBrain];
double resultNumber = [self.brain result:_secondEqual];
NSLog(@"%e",resultNumber);
NSMutableString *resultStr = [NSMutableString stringWithFormat:@"%lg",resultNumber];
NSLog(@"%@",resultStr);
// NSMutableString *resultStr = [NSMutableString stringWithFormat:@"%lf",resultNumber];
if(resultNumber>1000000000){
int count = 0;
while (resultNumber >=10) {
resultNumber/= 10;
count++;
}
[resultStr deleteCharactersInRange:NSMakeRange(0, [resultStr length])];
[resultStr appendFormat:@"%lg",resultNumber];
[resultStr appendFormat:@" E%d",count];
}
self.display.text = resultStr;
_secondEqual = YES;
}else {
NSLog(@"right!");
double resultNumber = [self.display.text doubleValue];
NSMutableString *resultStr = [NSMutableString stringWithFormat:@"%lg",resultNumber];
if(resultNumber>1000000000){
double count = 0.0;
while (resultNumber >=10) {
resultNumber /= 10.0;
count += 1.0;
}
[resultStr deleteCharactersInRange:NSMakeRange(0, [resultStr length])];
[resultStr appendFormat:@"%lg",resultNumber];
[resultStr appendFormat:@"e%g",count];
}
self.display.text = resultStr;
// [resultStr deleteCharactersInRange:NSMakeRange(0, [resultStr length])];
}
self.firstEqual = YES;
}
-(void)okBtn:(id)sender
{
[userDefaults setObject:self.display.text forKey:@"value"];
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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